Mercury 25 EFI Service Manual page 260

Cylinder Block/Crankcase
NOTE: Do not put plastigauge over the oil hole on the bearing surface of the crankshaft.
a b
a - Bearing projection in the cylinder block notch
b - Plastigauge
5. Install the bearing halves into the crankcase cover.
NOTE: Align each bearing projection with the notch in the cylinder block.
6. Install the crankcase cover onto the cylinder block.
7. Lightly lubricate the eight crankcase cover bolt threads with 10W‑30 4‑Stroke Marine Engine Oil. Tighten the bolts in the
sequence shown on the crankcase cover to the specified torque.
IMPORTANT: Do not move the crankshaft until the measurement process has been completed.
Tube Ref No.
10W-30 4-Stroke Marine
110
Engine Oil
Description
Main bearing bolts (8)
8. Remove the crankcase cover bolts and the crankcase cover.
9. Measure the plastigauge at its maximum compressed width.
10. If the oil clearance is out of specification limit, measure the inside diameter of the cylinder block and crankcase cover main
bearing journals.
SELECTING NEW MAIN BEARINGS
1. Locate the main bearing code on the cylinder block.
Page 4A-18
Description
a
b
11637
© 2016 Mercury Marine
Where Used
Crankcase cover bolt threads
a - Compressed plastigauge
b - Plastigauge scale
b
a
11632
Part No.
92-8M0078625
Nm lb. in.
24
90-8M0105568 eng MARCH 2016
lb. ft.
17