Crankshaft, Main Bearings, and Engine Block
Exploded View
a - Main bearing cap
b - Main bearings upper
c - Crankshaft
d - Main bearings lower
e - Lower thrust bearing
f - Oil seal
g - Crankshaft dowel
h - Crankshaft key
i - Upper thrust bearing
j - Rear bearing cap
k - Dowel rear bearing cap
l - Main bearing bolts
Removal
If only the main bearings are being serviced, refer to Section 3B ‑ Main Bearings without Crankshaft Removed.
NOTE: Engine port and starboard cylinder heads are removed for illustration clarity.
1. Ensure that all bearing caps are marked so that they can be installed in their original locations.
a - Main bearing cap
b - Bearing cap marks
Engine Disassembly
Page 3A-40 © 2016 Mercury Marine 90-8M0099748 eng DECEMBER 2015
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