Mercury 225 EFI, Service Manual

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RIGHT HAND NON-RATCHETING
Page 6A-30 90-884294 OCTOBER 2001
DISASSEMBLY
1. Both upper and lower tapered roller bearings can be removed from the drive shaft in
one operation. Using the bottom bearing cup removed from the gearcase, place the
cup on top of a vise leaving the vise jaws open enough to allow the drive shaft to slide
through.
2. Place the driveshaft through the cup and vise until the bottom bearing is resting in the
cup. While holding the driveshaft, tap on the top of the shaft with a lead hammer until
the bearings are free. Do not drop the shaft when performing this operation.
b
a
a - Lower Bearing Cup Removed from Gear Case
b - Drive Shaft With Both Upper and Lower Bearings
DRIVE SHAFT ASSEMBLY - Inspection
1. Clean all parts with a suitable solvent and dry the parts thoroughly using compressed
air, being careful not to spin the bearings.
2. The condition of the drive shaft bearing cup is an indication of the condition of the ta-
pered roller bearing on the drive shaft. Replace the bearing and bearing cup if the cup
is pitted, grooved, scored, worn unevenly, discolored from overheating, or has em-
bedded particles.
3. Inspect the bearing surface on the drive shaft where the needles of the lower pinion
bearing roll. Replace the drive shaft if it is pitted, grooved, scored, worn unevenly, dis-
colored from overheating, or has embedded particles.
4. Inspect the splines at both ends of the drive shaft for a worn or twisted condition. Re-
place the drive shaft if either condition exists.
5. Inspect the gear for pitting, chipped or broken teeth, hairline fractures, and excessive
or uneven wear. Replace the pinion gear and the forward gear as a set if any de-
fects are found.
6. Inspect driveshaft for groove(s) where water pump base oil seals contact shaft. Re-
place driveshaft if groove(s) are found.