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Pinion Bearing Tool Kit

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MerCruiser sells this as a complete kit p/n 91-31229A5 which lists for $273.60 but we sell the tool separately. Why buy the complete kit if you are only working on one of the drives.

This tool is used to remove and install the pinion bearing located in the bottom of the lower unit.

To remove the old bearing :
Never use a screw driver to try beating the bearing cage out of the lower unit without the roller bearings installed because you will bust the bottom out of the cage. If the rollers fell out, put some grease on the rollers and stick them back into the bearing cage. Thread the appropriate size bushing/driver onto the end of the threaded rod with the head of the driver facing upwards and drive the old bearing out using the rollers.

To install a new bearing:
Turn the bushing over and place the larger spacer over the bushing and then the new bearing with the numbers facing upwards. By using the larger spacer, you will now be pulling up on the outside of the bearing and not on the rollers.

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1968 - 1983 Pre-Alpha Tool Kit

This tool kit is used on Pre-Alpha drives made from approximately 1968 - 1983. It is used on lower units which have a pre-load pin on the top of the vertical shaft. The pinion bearing this tool is being used on has 14 rollers inside of it.

: Order # 1500

1984 - Date Alpha & Gen II Tool Kit

This tool kit is used on Alpha One & Generation II drives made from approximately 1984 - Date. It is used on lower units which do not have a pre-load pin on the top of the vertical shaft. The pinion bearing this tool is being used on has 18 rollers inside of it.

: Order # 1502

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Precision Services, Inc.
Shelby Township, Michigan 48316

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Last modified: May 09, 2008