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Mercury 40 Service Manual

Mercury 40
599 pages
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CYLINDER BLOCK/CRANKCASE
Page 4B-24 90-828631R3 MARCH 1999
7. Remove the crankcase cover. Measure the compressed plastigauge to check the main
bearing clearance. Replace bearings if clearance is not in specification.
53751
Main Bearing Clearance
0.0005 - 0.0017 in. (0.012 - 0.044 mm)
8. If replacement of the main bearings is required, refer to Main Bearing Selection and
Installation in Cylinder Block Reassembly.
Checking Connecting Rod Bearing Clearance
IMPORTANT: Do not interchange used connecting rod bearings. Reinstall bearings
in their original position.
1. Clean all the oil from the connecting rod bearing surfaces and connecting rod journals
on the crankshaft.
NOTE: Refer to instructions in Cylinder Block Reassembly for selecting and installing con-
necting rod bearings.
2. Place a piece of plastigauge on the connecting rod journals.
53751
a
a-Plastigauge
IMPORTANT: Do not rotate connecting rod when checking clearance.

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Mercury 40 Specifications

General IconGeneral
Horsepower40 hp
Starting SystemElectric
SteeringRemote
Fuel Induction SystemEFI (Electronic Fuel Injection)
Shaft Length20"
Full Throttle RPM Range6000

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