Gearcase Lubricant Capacity; Gearcase Lubricant Recommendation; Checking Lubricant Level And Refilling Gearcase - Mercury 25 EFI Service Manual

Gear Housing
8. Push up on the lower shift shaft and coupler assembly while adjusting the shift shaft coupler to align the upper shift shaft
hole in the coupler with the upper shift shaft.
9. Insert the upper shift shaft into the shift shaft coupler.
10. Secure the upper shift shaft in the coupler with a new spring pin using a suitable punch or press in with a pair of pliers.
a - Exploded view
b - Lower shift shaft
c - Spring pin
d - Shift shaft coupler
e - Upper shift shaft
11. Lower the outboard to the normal operating position.
12. Check the shift operation as follows:
• Place the shift lever in forward. The gear housing should ratchet when the propeller shaft is turned clockwise and
resistance should be felt when the propeller is turned counterclockwise.
• Place the shift lever in neutral. Resistance should not be felt when the propeller shaft is rotated in either direction.
• Place the shift lever in reverse. Resistance should be felt when the propeller shaft is rotated in either direction.
• If the shift operation is not as described, recheck the coupler installation procedure. If the coupler is adjusted
correctly, the gearcase may not be properly reassembled. Internal parts may be excessively worn and must be
replaced before the outboard is returned to service.

Gearcase Lubricant Capacity

Gearcase lubricant capacity is approximately 350 ml (11.8 fl oz).

Gearcase Lubricant Recommendation

Mercury or Quicksilver Premium or High Performance Gear Lubricant.

Checking Lubricant Level and Refilling Gearcase

1. Place outboard in a vertical operating position.
2. Remove vent plug.
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© 2016 Mercury Marine
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b
90-8M0105568 eng MARCH 2016
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