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Mercruiser Alpha One, R and MR Serial Numbers 6225577 THRU 0D469858

    Insist on ONLY Mercruiser Factory Trim Pumps!


Power Trim Pumps

Mercruiser has updated trim pump designs over the years.
It is important to match your pump with your cylinder style.

Older pumps (Prestolite) that have the square reservoirs and cylindrical motors are no longer sold.
These older units were High Pressure-Low Volume pumps.
Mercruiser now has replacement High Pressure-Low Volume pumps (see below).
This "adaptor" pump looks just like the new style Oildyne pump.
They used the smaller diameter hydraulic trim cylinders.
(pre-Alpha and "R"-drives)

Newer style pumps (Oildyne) are Low Pressure-High Volume pumps.
These newer units will have a plastic motor housing and a white plastic reservoir.
They should be matched to the newer larger diameter hydraulic trim cylinders.
(Alpha One, Alpha Generation II and Bravo Drives)
93247A7 High Press-Low Volume
93247A7 High Pressure-Low Volume Pump Assembly $639.00
Used on older pre-Alpha and "R" style applications.
Matched to the smaller older style trim cylinders.
Eliminates the need for a mechanical reverse lock valve.
 14336A17 Low Press-Hi Volume
14336A17 (New # 865380A25 )Low Pressure-Hi Volume Pump Assembly $949.93
Used on Alpha One, Alpha Gen II and Bravo Drive applications.
Matched to the larger new style trim cylinders.
    Partial Low Pressure Pump Assemblies
New Oildyne Partial Pump
14336A20 ( New # 865380A13) Low Pressure-Hi Volume Partial Pump Assembly (new) $730.00
Used on Alpha One, Alpha Gen II and Bravo Drive applications.
Includes Motor, Pump and reservoir only.
Matched to the larger new style trim cylinders.
 Remanufactured Oildyne Partial Pump
14336R8 new number 14336R20 Low Pressure-Hi Volume Pump Assembly (remanufactured) $525.50
Used on Alpha One, Alpha Gen II and Bravo Drive applications.
Includes Motor, Pump and reservoir only.
Matched to the larger new style trim cylinders.
    Important! The plastic reservoirs have changed.
Is your white plastic reservoir cracked near the mounting screw hole?
You are not alone.
Early plastic reservoirs uses one mounting screw and the reservoir would
develop spider cracks around the screw hole.
The old defective reservoir was part number 18525A1 which is no longer sold.
If you have a cracked single-screw reservoir tank, you will need to purchase
a Top-Mount style reservoir-pump kit 883169A1.
This is mentioned in Mercruiser Parts Bulletin 01-04.
Top Mount Reservoir-Pump Kit 883169A1
883169A1 Top Mount Reservoir Update Kit $368.00
Includes pump and top-mount style reservoir tank, screws and o-ring.
 Top Mount Reservoir only 883166A2
883166A2 Top Mount Reservoir $72.58
Fits new style 4-screw type pump housings only.
This tank will NOT fit the old style single-screw pumps.
Includes oring and screws.


What type of oil? These units all use standard 10-40WT Motor Oil.




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