Description
Check the specifications, dimensions, variation details, referenced part numbers, and available fitment evidence before matching this item to an application.
Vehicle information
Available fitment details
Listing compatibility notes
- Replaces GLM Part Number: 21900; Sierra Part Number: 18-2100; Mercury Part Number: 30-60794A4; OMC Part Number: 983937; Volvo Part Number: 3853807-0 Fits OMC Cobra and King Cobra Fits Mercruiser Bravo and Alpha Gen 1 and 2.
- Fits MC-1 / R / MR Fits Volvo Penta This is the grease able type.
- Your transom must have a grease zerk fitting.
Fitment data is provided as a buying aid. Verify the listing against your vehicle and existing part before ordering.
Parameters, dimensions, material, fitment, and part numbers
Buying guidance
Quick decision
A rod & main bearings listing with source specifications kept visible for comparison.
Fit and size notes
- Replaces GLM Part Number: 21900; Sierra Part Number: 18-2100; Mercury Part Number: 30-60794A4; OMC Part Number: 983937; Volvo Part Number: 3853807-0 Fits OMC Cobra and King Cobra Fits Mercruiser Bravo and Alpha Gen 1 and 2.
- Fits MC-1 / R / MR Fits Volvo Penta This is the grease able type.
- Your transom must have a grease zerk fitting.
Before you buy
- Verify the referenced part number: 21900, 18-2100, 30-60794A4, 983937, 3853807-0.
- Compare the listing title, photos, package contents, and specifications with the part being replaced.
- Confirm vehicle compatibility and installation requirements before ordering.
Customer feedback
Ratings and written reviews
4.2 / 5
242 source ratings
Source: Amazon. Imported marketplace feedback is shown for product research and is not a review of a purchase made on this website.
Veronica Schramm –
This was the perfect fit and we are very happy with it. It arrived more than promptly and we would definitely order more from them when need be. and with boats, there will always a need be!
STEVEN E. –
Had noise and vibration in Alpha drive. Installed new bearing and problem solved. NOTE..GREASE THE BEARING BEFORE INSTALLATION.WHEN INSTALLING MAKE SURE YOU ALIGN THE GREASE HOLES OF THE BEARING AND RETAINER WITH GREASE HOLES IN THE HOUSING… ADD ABOUT 5 (USING A FULL SIZE GREASE GUN) PUMPS OF RECOMMENDED GREASE TO THE BEARING. START THE ENGINE USING WATER ‘MUFFS’ AND RUN AT MODERATE SPEED A COUPLE OF MINUTES. CHECK FOR NOISE, VIBRATION AND PROPER INSTALLATION OF DRIVE BY SHIFTING THROUGH GEARS AND SLOWLY TURNING WHEEL FULLY LEFT AND RIGHT (MAKE SURE WATER HOSE IS CLEAR OF PROP DURING PROCEDURE). STOP. ADD ANOTHER 5 PUMPS OF GREASE AND HEAD TO THE LAKE.
Isaac –
We have purchased several of these for our shop. They work as designed. Put it in the freezer for 30 minutes before you install ! It will slightly shrink and make the installation a breeze.
Douglas –
Have not installed yet, but looks to be good quality material.
Jesse Bloom –
DO NOT BUY!!!! This is a sealed unit and not a greasable bearing. Furthermore, machining is terrible. Tried a test fit on driveshaft before installing and would not slide o to drive shaft. Thought that it would go on with a little love so I installed bearing. Outdrive would not fit back on. Driveshaft whole diameter is too small for driveshaft to fit through. Purchased oem quicksilver bearing and everything fit perfectly. Long story short, buy oem.
KWB –
Not bad for the price tolerance seem a little tight, but that’s OK
Michael Eamon –
It’s great.Used on merc cruiser alpa one gen1.
Customer –
Like
c. brendal –
perfect fit, seems heavy duty, and makes no noise at all so far