See full version: How much gear lube for merc alpha one
Lower the drive into the down position.
Place an oil drain pan under the drive.
Use your large slotted screw driver and remove the lower plug (see image below).
TIP: If the drain plug is stuck, try using an Impact Screwdriver and hammer.
Once the Vent Screw is removed the oil will drain much faster.
Let the lube drain out for a good 15 to 20 minutes.
Re-tighten both screws with your large slotted screwdriver.
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Chances are good that your reading is too high or too low.
It is very rare to have the correct rolling torque on your first try.
The rolling torque is changed by adding or subtracting shims from either the upper or lower bearing race.
Which shim you add or remove depends on your gear height.
If your rolling torque is OK, go on and measure your gear height.
The gear height is measured with shim tool 91-60526T and a long .025" feeler gauge. [links]
The special tools from Mercury for building the Driveshaft Housing are:
NOTE: Prices are subject to change.
Mercruiser changes prices on a regular basis.
91-38756 Adaptor $15.35
91-38918T Bearing Cup Driver $16.10
91-33493T Driver Cup $21.40
91-43591T Oil Seal Driver $18.55
91-60526T Shim Tool $83.20
91-60523 Shim Tool $57.70
91-34569A1 Slide Hammer Kit $134.90
91-66274 Torque Wrench (inch) $182.95
91-17256 Retainer Wrench $71.00
91-37241 Puller Plate $104.30
90-12934--2 Service Manual #6 for R, MR and Alpha Drives $73.00
You will now do a "trial run" assembly to get the lower gear assembly height and rolling torque.
This procedure is done BEFORE installing the two lower seals. [links]
Installing the Lower Bearing Onto the Lower Gear
Freeze your lower gear if feasible. This will make it easier to press the bearing in place.
Place the gear and shaft assembly upside down in the press.
Use care not to bend or damage the installed top bearing.
Use the bearing cone from the old bearing and an adequate pipe to press the new bearing
onto the lower gear. Make sure the bearing is fully seated. [links]
Clean and Reinspect All Your Parts more
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