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Upper Double Drive Gear Bearings

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    1965 - 1997 Double Bearing Assembly

These double bearings are MerCruiser p/n 31- 35988A2. They are used on all #1 MerCruiser drives made from 1965 to 1997 ( except 1.32 ratios) including Pre-Alpha, Alpha One and Generation II drives serial #OK999999 and below.

Both sets of these bearing are the same
Cup # 382A outside Dia. 3.813
Cone # 386A inside Dia. 1.875

 

 We are currently out of stock on this item 

 

 

 

 

 

These are used on either gears which have a slip fit or gears which have a press fit. They come from the factory with the 1/4" center  spacer preset to give you 6 to 10 inch pounds of preload.

Click here for setting these bearings.

Shipping Wt.  4 1/2 Lbs. 

 

         : Order # 1520

 

 We are currently out of stock on this item 

 

 

         1998 - Date  Gen 2 Bearings Only

These double bearings are MerCruiser 31- 30894A1 Bearings. They are used on all Generation II drives made from 1998 to Date serial #OL100040 and Up.

These bearings and races are used on drive gears which have these bearings pressed onto the gear. You can use your old large center spacer with these bearings only. You set the preload on these bearings  by how tight you tighten the gear end locknut down drawing these 2 bearings together on the oversized gear shaft diameter. 

Both sets of these bearing are the same
Cup # 25520 outside Dia. 3.265
Cone # 25580 inside Dia. 1.750

Click here for setting these bearings.

You cannot put these bearings together and torque the nut down to 80 foot pounds.

Shipping Wt.  4  Lbs.  

         : Order # 1998

 

 

    1998 - Date Gen 2 Bearing Assy.

These double bearings are MerCruiser 31- 30894A5 Bearings. They are used on all Generation II drives made from 1998 to Date serial #OL100040 and Up.

These bearings and races are used on drive gears which have these bearings pressed onto the gear. This set comes with the center support spacer.  You set the preload on these bearings  by how tight you tighten the gear end locknut down drawing these 2 bearings together on the oversized gear shaft diameter. These are the same bearings as shown above except they come with the center support spacer which is not sold separately by anyone.

You cannot put these bearings together and torque the nut down to 80 foot pounds.

Click here for setting these bearings.

Shipping Wt.  4 1/2 Lbs. 

         : Order # 1522

 

 

                       All Bravo's

This upper housing double bearing assembly is MerCruiser  31- 86763A2. It is used on all Bravo drives.

These bearings and races are used on drive gears which have these bearings pressed onto the gear. This set comes with the center washer.  You set the preload on these bearings  by how tight you tighten the gear end locknut down drawing these 2 bearings together on the oversized gear shaft diameter.

Both of these bearing sets are different.
The first set to go into the upper housing is 
Cup # 28621 outside Dia. 3.812
Cone # 28682 inside Dia. 2.249

The second set of bearing to go in are
Cup # 383A outside Dia. 3.937
Cone # 387 inside Dia. 2.249

You cannot put these bearings together and torque the nut down to 80 foot pounds.

Click here for setting these bearings.

Shipping Wt. 3 1/2 Lbs.

          : Order # 1525

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