Coupling flange removal Never hammer the propeller, or any other component, to remove the shaft from its coupling. Thanks, Rick. On this boat, an Ericson 34, the shaft just barely slid by the rudder with the cutlass bearing removed. For this reason the portion of shaft exposed to the sea water is sheathed by a bronze liner shrunk fit on the shaft. (2) The condition of the lub oil is tested every six months at a laboratory approved by the classification society. Hydraulic propeller removal tools are versatile and will work with most propellers. A good machine shop should be able to straighten the shaft, saving you some money over a new shaft. This calculation proves that the slipping torque is at least 14 to 15 times greater than the service and even the maximum power the engine can continuously develop. For a push up load of 700 tons the normal reaction on the taper face is 700*14* 9.81=96138 KN. Remove propeller shaft from transmission output flange and remove constant-velocity joint from rear axle differential. Plenty of oil is smeared on the surface of the shaft to reduce friction whilst being pushed in. The redrive should be removed from the engine and the oil drained. The more accurate reaction is 96380KN. The best alignment condition is obtained and the coupling holes bored to suit new coupling bolts which could be of a slightly larger diameter, suitably machined to fit hard tight in their holes. At least once or twice a year you should remove the propeller and give the shaft, washers, and spacers a good greasing to help prevent the prop from seizing on. (6) Chrome liners forward and aft flange connections uncoupled and chrome liners pushed in (7) A light mark(line) made on taper of shaft in line with forward edge of the boss made. (4)The propeller nut is tightened sufficiently with spanner till it cannot move any further. This is an approximate and average estimate. A corroded motor shaft will make it nearly impossible to remove the impeller. Once and a while you might come across a propeller that is seized on the shaft and won’t budge. The reasons for the seals to leak are as follows: (1) Some gritty matter like sand can get between the seals and the chrome liner and erode the seals and cause grooving of the liner surface leading to leakage. This  is  another  reason  to  be  considered  even  if  the   flange  coupling  is  a  muff type  coupling. Remove the propeller nut by turning it counterclockwise with an adjustable wrench. This is a guide to the L322 propeller shaft removal and installation. I need to remember to be less terse and more helpful in my responses. (13) Cone bolts cemented. Proportionately the mass also increases considerably. (2) A cast iron sleeve to be placed between shaft taper and propeller boss to increase the coefficient of friction. If you need a more in-depth tutorial consider downloading our official Range Rover L322 Repair Manual from the link below. Slather white marine grease on the propeller shaft and inside the propeller's hub. Every now and then a sailboats prop shaft needs replacing. Hub removal 1. The shaft torque formula is given by T/J =ft /R , Where T is the torque transmitted and resisted J is the polar second moment of area of cross section of shaft. 1. The present confirmed method is to force fit the propeller directly on the shaft taper. This is true for large ships having heavy propellers It may be concluded as follows: Fatigue effects are predominant around the keyway because of sudden change of shape or surface, and around or throughout the circumference around the larger end of the taper because of change in direction of the principal stress occurring at a high frequency. It happens after about twenty years in service. vulcanizing is rubber welding and is commonly used in tyre tube punctures. leading to fatigue condition at the area around the bigger end of the taper. Most of these ships had conventional shafting systems , sea water lubricated. India Automotive Axle & Propeller Shaft Production (K Units), Revenue (US$ Million), Price (USD/Unit) and Gross Margin (2016-2021) Table 25. This method uses force fit coupled with shrinkage to give a much higher grip than keyed propellers. 3. (4) The three vulcanized seals are mounted on the chrome liner. The bending moment causes the upper surface to strain in the tensile mode and the same surface when it comes down after half a revolution strains in the compressive mode. Can a shaft be straightened or should I just buy a new shaft and be done? The ballast can be so arranged to have the aft peak tank empty and forepeak filled up along with the forward D.B. So guide this will work for both. The shaft is lifted up , the hard spots formed on the propeller taper surface are scraped off . When this happens, you have to cut off the impeller and chip all of the plastic away from the brass nut before you can remove the nut with a wrench. The Prop Shop Stocks; Prop nut sets, nut kits, slotted nuts, key stock, prop bushings, shaft logs, struts, shaft seals, and all your inboard propeller hardware needs. In shipyard practice the ship is moved by tugs from repair berth to the dry dock and engine is not used. (10) Forward seal chrome liner is similarly attached to shaft half collars fitted in position. When the transmission fails or if a bushing goes out on your ATV, you need to remove the drive shaft in order to repair the four-wheeler. This method of fixture also failed because the locked in shrinking stress is not uniform since the grain size of cast iron matrix is not uniform and free graphite is found in the matrix which causes non uniform stress in the shrink leading to breakage/ cracking of the sleeve . Remove prop. A secure stage is built around the stern frame so that workmen can safely stand in the staging work safely. On many boats the removal of the cutlass bearing can help avoid the necessity of dropping the rudder. If several knocking attempts fail, move on to another method. The process of tightening was by slogging on a short ring spanner by a heavy sledge hammer. The  general  scheme  of  withdrawal  is  therefore  as  follows: (1) Intermediate shaft coupling bolts forward and aft slackened ,eased and ready for removal with couple of bolts at both ends in place to prevent turning of the propeller shaft when dismantling the propeller nut. Once the shaft corrodes, it expands and locks to the impeller sleeve. The third common option is a taper coupling. In order to remove the seals without removing the carrier. If you do need one, I have used the harmonic prop knocker type (I know that skidim.com has them) and was amazed at how well it worked. The cut shipside plate with the cut frames will be welded back after completion of repairs. The invention of the Pilgrim nut is credited to the principal surveyor of Lloyds register about that time and the name he gave to this nut is pilgrim named after a religious preacher named Bunyon who happened to be his ancestor. The propeller is placed horizontally on four wooden blocks of equal height and the blades clamped to the floor. Reference for limit of push up during assembly. In all other respects the method is similar to the keyed propeller shaft fitting and withdrawal. The shaft after withdrawn inwards is cleaned thoroughly after it is properly supported on wooden blocks placed on the plummer block stool. Moreover, there are various other attachments that are to be fitted with and around the … Recommendations will be given for suitable repairs. Unbolt shaft coupling from transmission flange. 2. The method of fitting is shown in sketch given as under. The old shaft runs true to the strut and then I have a total of 1/4" to 1/2" wobble behind the strut at the propeller end of the shaft that is visible. Hammer impacts will be resisted by the output shaft bearing in the gearbox, which may well be damaged by this treatment. (6)The propeller should be forced only till its forward edge reaches the reference mark made before dismantling (7) The intermediate shaft inserted in place and connection of coupling bolts and plummer block attachment continues till completion. (see sketch given under Fig:Dismantling arrangement with pilgrim nut). Remove the plank and slide the propeller from the shaft. Boat: 1991 Prostar 190, fuel injected 302, Maintenance Tips, How-tos and Refurbishing Topics. Jacking  off  the  propeller after  the shaft  nut  is  dismantled  and  withdrawing  the  shaft  inwards    and  finally  resting  it  in  the  space  created  by   the  intermediate. Global Automotive Axle & Propeller Shaft Consumption Market Share by Region (2016-2021) Table 27. Internal inspection of propeller boss and inspection of blades for noting cavitation pitting as well as cracks at blade tips . The average working clearance is about 4mm at renewal time and reaches 10 mm at renewal time. Removing the propeller drive shaft (also called the center drive shaft) is necessary when you are removing the engine/transmission, changing the flex disks or removing the differential/ rear subframe. Normally the propeller shaft has a larger diameter than the intermediate shaft since the stresses on propeller shaft are higher than the stresses on the intermediate shaft. Grasp the prop, remove the knocker, and remove the prop. Special hydraulic jacks were developed to cater to these needs . I want ship job . The propeller shaft is subjected to the full power torque as well as the bending moment caused by the overhang of the propelled at the shaft end, whereas the inter mediate shaft is subjected to only the full power torque. I pulled the shaft out of my boat (V-Drive) and had to use a shaft puller. In this method the shaft taper is either 1;18 or 1;20 as per the individual classification rules. Damage to the shaft can be caused by corrosion, bending or wear at the stuffing box or cutlass bearing surfaces. Your email address will not be published. The procedure is similar to most cars and it is exactly the same for W126 and many Mercedes models. If no Pilgrim nut provided use shaft end to support jack supplied by yard for forcing out the propeller. Hub and shaft evaluation and preparation. Propeller drop taken and recorded and rope guard welded in place The sketch of the assembled shaft and propeller is shown as under. Marine Uniforms for MCA-UK & Rest of the world, Withdrawal of Propeller  shaft, survey and assembly, propeller shaft Withdrawal,survey assembly, Verification of tightness of nut on shaft, Assembly of propeller shaft and propeller, Sea water cooled/lubricated stern tube and shaft:-, Development of the Keyless propeller shaft, Renewal of propeller shaft using Spare propeller shaft, WHAT IS DRY DOCK? (Fig :Fitting and tighteneing arrangement with pilgrim nut), Fitting and tighteneing arrangement with pilgrim nut. This bending moment contributes to the torque causing an increase in the stress level at the surface of the taper. How to Remove a Seized Propeller. The provision of a spare shaft on board eliminates long periods of idle layup and unemployment since the propeller shaft is a ship specific item and to order a shaft will take minimum six months for delivery including shipping time. With constant velocity joint pulled apart, attach propeller shaft to drive flange of rear axle final drive. They are, however, costly. (12) Propeller stern tube oil tank filled with new oil, air purged and shaft given two turns using turning gear to ensure aft seals are tight. propeller shaft Withdrawal,survey assembly .All large single screw ocean going ships have solid flanged propeller shafts, which necessitates the withdrawal of the shaft within the machinery The Rudder is ;positioned just behind the propeller and hence prevents the outward withdrawal of the shaft . Remove coupling from shaft. The average diameter size is restricted to not more than 250 mm. The opening will be closed only after the old shaft is removed out and the spare shaft taken in after the spare shaft has completed preparation for fitting. At times the leak is too much and nearly uncontrollable, even after fully tightening the gland, that a diver has to be employed in port to temporarily stop entry of sea water, whilst the packings are being renewed. Undo and remove all clamping bolts between the flange and shaft. (I) Renewal of seals in afloat condition or in dry dock without withdrawal of shaft as well as chrome liner :- At times occasionally the aft seal starts to leak and develop into a big leak within a few days making it necessary to either dry dock the ship or renew the seals in afloat condition. While other outboards have a hole drilled through their propeller shaft, a matching hole in the propeller, and a pin can inserted through both, Mercury Marine's propellers don't. A general inspection is carried out. : (1) The spare shaft is normally clamped on the ship side and is removed by cutting the ship side along with the clamped shaft and laid on the floor of the dry dock where it is dismantled from the plate and the shaft thoroughly cleaned of the protective paint , the taper keyway and key thoroughly cleaned. (5)If nut is pilgrim type hydraulic forcing can be done using a dial gauge to register amount of movement of propeller on taper. If the key and keyway are eliminated about 75% of this problem is solved. Ranger Rover L322 Propeller Shaft Removal. The procedure is as follows. The nut is mounted on the shaft threads screwed in and the radial play as well as the axial play are noted. A bulkcarrier or tanker of 80000 DWT will have a propeller weighing 35 Tons. Boat: Mastercraft, Stars and Stripes, 425hp/454 Chevrolet, Actual Marineworld/Africa USA Towboat, I am going to replace the propeller shaft on my '82 S & S due to a slight bump last trip out. Use a hammer and punch to remove the carrier nut. I prefer to install propellers on a taper engage­ Such a large mass contributes a sizeable bending moment at the commencement of the taper on the shaft because of the overhang of the propeller from the stern boss on the stern frame. The grooves are left without any build up or filling . In some adamant and difficult situations application of heat by large gas torches was resorted to and had to be done very carefully to prevent cracking of the propeller boss. You need to locate and remove the set screws. Hello, I have a bent prop shaft on a 2005 yamaha outboard 90hp motor. (2) General inspection of stern tube internal ;- The stern tube internally is cleaned thoroughly after draining all the oil. Its bore is cone­ shaped in precisely the same manner as a propeller hub bore, and it engages an identical male cone machined in the forward end of the prop shaft. (2) The propeller taper has to be bedded by progressively forcing the shaft taper into the propeller and scrapping off the hard spots on the propeller taper. (10) When propeller jumps off taper withdraw propeller shaft completely whilst the weight of the propeller is held on the chain blocks. Hence the need for keyless propeller shafts. (2) The propeller is lifted , positioned and supported to receive the propeller shaft. Note: Entering wrong username in the login form will ban your IP address immediately. Shaft propeller removal and cleaning. To free the boss from the shaft taper , steel wedges were inserted between the stern frame post and the propeller boss and the wedges were slogged in the same manner till the propeller jumped off the taper. Initially some ships were fitted with keyless shafts and cast iron sleeve fixed firmly on the shaft using Araldite impregnated at a high pressure at the joint, but this system proved a failure as slippage of the joint occurred in some ships. Undo the nut, heat the prop boss with the blowlamps until its as hot as you can get it. The box along with spacer rings are dismantled completely , leaving the seals on the chrome liner. The drive shaft is the main shaft connected to the transmission on the bottom of ATVs. 9. Hand-tighten, then rap — don't bang — on the prop knocker four or five times with a hammer. Rick, sometimes you can get away without one. NECESSITY OF DRY DOCKING, Withdrawal of Propeller shaft, survey and assembly. The sketch given below shows the aft seal box with all its components exposed. The bushing is now substituted by a patent hard rubber called Cutlass rubber or Railko a synthetic fibre material. Hence this job can be commenced and completed before ship enters the dry dock. Whack the other side of the boss. 2. Assuming the coefficient of friction to be 0.3 and assuming a mean radius of 160 mm the frictional torque preventing slippage between propeller and shaft is given as 96380*0.3*0.16 = 4626 KNM. Propeller Shaft | Function , types , Components and Requirement. The slipping torque is considerably increased by reducing the taper angle and increasing the coefficient of friction. The taper ratio defines the taper angle and is the Tan of the taper angle. 4. During the fifties of the last century the average size of ships were in the region of 6000 to 7000 tons displacement and there were a few ships over 10000 tons displacement. Hence the name pilgrim nut. In this case the hammer was heavier weighing about 200 kgs slung from a support at the stern frame by a rope and made to swing from a higher position so that it struck on the spanner head with a strong impact causing the nut to ease off. It is understood as follows. Penetrating oil (PB Blaster and the like) and/or heat may due the trick. (Fig :Simplex stern tube seal). The shaft is pushed in carefully to prevent the edges of the taper surface from damaging the white metal surface. (3) The new seals one by one are slit , opened and mounted on the shaft forward of the chrome liner , the slits are vulcanised by a portable vulcanizing tool and then placed on the chrome liner. This problem came to light only when powers started increasing. This is a statutory requirement as per classification rules and is carried out by a powerful horse shoe electro magnet fed by a 12 volt portable battery. Remove the nut and screw the prop knocker, aka harmonic puller, onto the shaft. Readings are recorded as calibration inspection records issued by shipyard. A cylindrical nut with an inner flange is screwed on the threads. (4)Magna flux checking for cracks on shaft taper and keyways. Pull out constant velocity joint (1), up to limit position. Much easier than trying to remove the spring pins. Set the punch against the end of one of the slots in the carrier nut and tap the nut with the hammer until it comes loose. The crack locations and their grooves are mapped and recorded in the survey report for future reference. But even with this precaution sand along with sea water has a free entry into the shaft. Whether you're replacing a propeller on your Mercury or removing it to take it to the prop shop for a tune up, removing the propeller on a Mercury Marine outboard is unlike propeller removal on other outboards. (H) Method of fitting keyless propellers:- The present method of fitting the propeller is called ‘ Wet fit method”. This is a common feature of this arrangement. (9) Chrome liner flange aft attached to propeller with new joint between chrome liner flange and propeller. To do this, simply loosen the set screws on the complier at the end of the shaft where it connects to the transmission. (9) If Pilgrim nut use pilgrim nut in dismantling mode. Slide the forward thrust hub and the replaceable drive sleeve over the propeller shaft. All ships having keyed propeller shafts carry a spare propeller as a rule requirement . The presence of these grooves do not affect the strength of the shaft as far as the depth of the grooves are within the design diameter of the shaft. It was then considered to shrink fit the cast iron sleeve on the shaft taper . (8) On propeller end propeller nut tightened to its mark or locking position and locking plate fitted. The propeller boss has a hole connecting the boss surface to the hollow core and the boss is pressurised by high pressure hydraulic fluid injected into the boss by a high pressure pump and at the same time pressurising the pilgrim nut for fitting and withdrawal. The method of withdrawal for survey and refitting are sam,e as in the case of oil lubricated shaft systems . tanks pressed up so that the ship trims by head and brings the stern tube opening out of the water by at least over 15 cms. Required fields are marked *. The drive shaft (also called propeller shaft or prop shaft) is a component of the drive train in a vehicle, with the purpose of delivering torque from the transmission to the differential, which then transmits this torque to the wheels in … I have never done this before but, know that I am capable. The first method is a common method that uses a drywall screw or self-tapping screw. Evinrude / Johnson . When assembling the same method was used to push up the boss on the taper till it reaches the mark by slogging on the spanner to start and move the nut. Is there anything that I need to know or any little tricks that anyone can share with me as to this task? At every shaft survey the bush strips or the cutlass bush has to be renewed since the wear is high. (4) When the intermediate shaft is to be fitted the shaft alignment is carried out at the forward and aft coupling flanges. The white metal bushes forward and aft are checked for cracks, pitting and looseness of metal. The box is made in two halves for enabling dismantling and renewing seals in afloat or dry dock situation without dismantling the shaft. Clean the propeller shaft, removing shells, fishing line and other debris. (11) Lower propeller down to rest and keep it properly supported. (3) Propeller cone dismantled , propeller nut key dismantled and propeller nut taken out (Fig: Propeller nut locking device), (4) Propeller blades position adjusted and weight of propeller supported by slings and chain blocks which are suspended from bridles(harness) properly rigged from poop bollards. If the calibration shows excessive wear the bushes have to be remetalled and suitably machined. The classification societies recommended the elimination of the key and keyway, but at the same time they wanted to play safe and so they recommended two changes initially : (1) The taper ratio to be increased from 1:14 to 1;18 or 1;20 . The shaft is lifted in the vertical mode supported at the flange and lowered into the propeller taper till it is about 15 cms from the end of its travel, when the crane brakes are released and the shaft drops into the propeller taper with a force. (3) The old condemned shaft is taken out of the ship through the opening on ship side and the spare shaft taken in and placed in the position where the old shaft was resting. Ft is the maximum stress (torsional) at the shaft surface. Outboard Propellers . When welding is completed a sea water hose test is carried out to ensure that the ship side does not leak. A split liner about 6mm thick is introduced between the propeller boss and the chrome liner so that the locations of the seals on the chrome liner are changed and fit on an unworn surface , avoiding the grooves formed. All keyed shafts have a taper of 1:14 as per class rules. As an example, during the course of their research they observed that the push up load on the propeller during assembly is about 700 to 800 tons . The classification societies recommend fitting keyless propellers for large ships to avoid fatigue cracking to occur on the taper fitting surface with the following conditions: (1) the survey interval is enhanced to ten years , provided that at every dry docking the seals are subjected to a leak test similar to the keyed shaft assembly procedure. Loosen the guides in the flanges of the propeller shaft by means of a cylindrical punch (R = 10 - 12 mm, length = about 150 mm). The flange provides a stop located a short distance from the propeller hub thereby limiting movement of the propeller down the tapered shaft at the instant it is broken free. This the leak test to be carried out to ensure the seals are tight and is also simultaneously checked for forward seal. Locate the cutlass bearing Set Screws. (11) Propeller cone filled with new tallow and fitted in place. I am pale fabaricart or good pipe fitter, Your email address will not be published. (It is harder to reinstall the hub properly if the redrive is not removed.) Remove the rear propeller shaft from the main gear. The process of slitting and vulcanizing is shown in the sketches given bellow. you’ll want to remove your shaft regularly, there’s little to recom­ mend this type. Install shim. To remove the prop from the shaft you need a very good puller (I have yet to find one) or a couple of good blowlamps, a sledge hammer, and a lump hammer. propeller shaft Withdrawal,survey assembly .All large  single screw  ocean  going  ships   have   solid flanged  propeller  shafts, which  necessitates  the  withdrawal  of  the  shaft  within  the  machinery    The  Rudder is  ;positioned  just  behind  the  propeller and  hence  prevents  the  outward  withdrawal  of  the  shaft . No way could I have gotten it out without it.... 88 PS190, Your a good guy for providing a full explaination. This made the classification societies to contemplate on why these cracks were occurring and all leading classification societies broke their heads on finding the cause of this phenomenon . (3) The propeller shaft is inserted till it enters and sits on the propeller taper. (Fig 14) (5) This same repair can be done in afloat condition, provided the ship is in ballast condition. Bring a support under the propeller shaft so that it is not bent when removing a large angle. Because in general propellers are bronze and shafts are iron it is conventional in shipyards to remove the propellers by a heat expansion process. Keeping the size of various types of propellersin mind, you would realize that it is a daunting task to mount such propellers onto the propeller shaft during the ship building process. This flange must remain on the propeller shaft. Some superintendents economize by retaining the chrome liner and by machining the liner surface up to i mm so that the grooves caused by the seal disappear and give a smooth surface throughout. Slide the thrust washer onto the shaft and over the splines on the shaft, until it makes firm contact with the propeller. In the case of the propeller shaft ,for withdrawal purpose in dry dock the same procedure was used. Remove prop. 4. Combination tool kits are available to remove propellers, shaft … This is another reason to be considered even if the flange coupling is a muff type coupling. (Fig 14) The arrangement is shown in sketch given below. (Fig: Propeller slung on chain blocks), (5) Intermediate shaft along with plummer block lifted up and held in place by attached chain blocks. (1) The Assembly of seal gland boxes with new chrome liners forward and aft are fitted in their respective positions with a cellophane cover to prevent dust entering the seal box.
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