Re: Auto Prop Rebuild

eric freedman


Here are the instructions for the autoprop. Takes a bot 3 hours due to the difficulty inremoving the split bearing from the blade.

Fair Winds


SM 376 Kimberlite

H6 Roller Bearing General Instructions


Your Autoprop is supplied assembled, tested, balanced and ready to fit to your yacht. 

Observing the following instructions will ensure a correct installation and trouble free service for a long time. Do not grease your propeller during installation.




Before fitting your new Autoprop ensure that the cutlass bearing is not worn.  A worn cutlass bearing will not be suitable for any propeller.  If it is worn replace it with a good quality bearing assembly with a brass shell.


  1. After removing the old propeller check that the shaft taper, key and thread are undamaged.


  1. Try the new shaft nut (#11) on the thread.


  1. Check that the key will slide through the keyway in the propeller hub. Clean and dry the taper on the shaft.


  1. Without the key in the shaft push the Autoprop onto the shaft firmly.  Mark the shaft at the fwd end of the propeller hub.  Now remove the Autoprop and install the key into the shaft.


  1. Re-install the Autoprop making sure that the fwd end of the hub comes to the mark you have made on the shaft previously.  If it does continue with the installation.
  2. If not then you will remove the Autoprop and file the key until you can push the Autoprop onto the shaft to your mark.  This is now showing that the propeller hub is matching the shaft taper correctly.


  1. Tighten the shaft nut (#11) to the shaft with a socket spanner (0.875).


  1. Install and tighten the shaft nut locking screw (#10) into the shaft nut.  It may be necessary to dimple the nut if the locking screw does not match up with one of the flats on the shaft nut.


  1. Smear the shaft nut locking screw (#10) with Loctite or other thread locking compound and retighten into the hub against the shaft nut.


  1. Replace the zinc anode (#12) with the nylon screws.  Do not over tighten.


  1. The Autoprop is now ready to use.  There is no need to grease the propeller as it has been done at the factory prior to shipping to you.




Removal of your Autoprop:


Autoprop makes and sells an Autoprop specific propeller puller.  However most three legged prop pullers will work with the Autoprop.


  1. Remove the zinc anode from the aft end of the propeller.


  1. Undo the shaft nut locking bolt … at least until it is clear of the shaft nut.


  1. Unscrew the shaft nut from the shaft.


  1. Remove the propeller using either the three legged puller or the Autoprop puller. It is not correct to simply pound the fwd end of the hub with a hammer.


  1. If using the Autoprop puller, screw the plate onto the back of the propeller using the socket head metric screws provided into the holes for the zinc attachment.  Now thread in the large jacking bolt and tighten against the end of the shaft until the Autoprop comes loose from the taper.


  1. Tape the key to the shaft for safe keeping.  Keys are a part of the shafting and not a part of the propeller. 



Haulout Inspection and Cleaning:


  1. Whenever you haul the boat for bottom cleaning or other reasons … have the Autoprop pressure washed before it has a chance to dry out.


  1. This will remove any deposits, which, if left to dry will make the propeller feel sticky when rotated.


  1. After washing, rotate the blades by hand to ensure they are free moving.


  1. Next “rock” the blades back and forth to also check for free movement in this direction.


  1. If movement is felt at this time then refer to the Bearing Adjustment section as the tension on the bearings might well require attention.


  1. Prior to re-launching the boat power wash the propeller as this will remove any foreign particles which may have lodged in the race and bearing areas.  Boatyards can be dusty locations.


  1. Please refer to the Greasing your Autoprop section should you need to re-grease the bearings.


  1. It is recommended to re-grease your propeller if you plan to have the boat hauled out for a long period of time.



Greasing your Autoprop:


To re-grease your Autoprop it is not necessary remove the propeller or to remove the blades

Always use a good quality waterproof lithium grease.  In USA we recommend

CRC # SL3110 .. generally found at an auto parts store like NAPA.


  1. Locate the grease channel screws (#7).  There will be two per blade … one at the side of the blade and one in the centre. Note that there are “O” rings fitted to each screw.


  1. Remove the 5mm pan head screws … two of them per blade, using an allen key.


  1. Fit the grease nipple (TRI-0168 supplied with each propeller) into the grease channel (#7) and connect to the grease gun.


  1. Pump the grease into the blade until you have forced the older grease out of the other hole (#7).


  1. During the procedure rotate the blade back and forth so as to get new grease around the bearings.


  1. When new clean grease exits the second hole in the blade you are finished.


  1. Remove the grease nipple.  Clean any excess grease from the blades and replace both of the channel screws (#7) into each blade.


  1. Proceed with the other two blades and you will be complete.



Autoprop Maintenance:


Your new Autoprop is fitted with greasing channels and screws in each blade.  It is not necessary to remove blades to re-grease the propeller.  It cannot be done under water, but should be done during a routine haul out and bottom cleaning.

It is recommended to re-grease every year if possible but at least every two years.


The Autoprop needs good protection from electrolytic and chemical corrosion. Ensure that you replace the zinc anode (#12) each year.  For extra protection it is advisable to fit a shaft zinc or shaft bushes, as the Autoprop zinc will only protect the propeller.


Eventually the Autoprop bearings will need replacing.  This is a straight forward  procedure and is covered in the kit when ever a bearing replacement is requested.

To order a bearing kit simply contact your Autoprop dealer and have the serial number (#serial number) at hand.



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