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Mercury 40 Service Manual

Mercury 40
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BIGFOOT GEAR HOUSING
Page 6B-20 90-828631R3 MARCH 1999
12. Remove components from propeller shaft.
13. Replace cam follower if worn or pitted.
14. Replace sliding clutch if jaws are rounded or chipped. Rounded jaws indicate one or
more of the following:
Improper shift cable adjustment.
Engine idle speed too high while shifting.
Shifting from neutral to reverse (or forward) too slowly.
51265
a
b
c
d
e
f
f
a-Cam Follower
b-3 Metal Balls
c-Guide Block
d-Spring
e-Sliding Clutch
f-Jaws
15. Check bearing surfaces of propeller shaft for pitting or wear. If shaft is worn or pitted,
replace shaft and corresponding bearing.
16. Replace propeller shaft if any of the following exist:
Splines are twisted or worn.
Oil seal surface is grooved.
Shaft has a noticeable “wobble” or is bent more than 0.009 in. (0.228 mm). Prop
shaft trueness should be measured with a dial indicator with prop shaft on V-blocks.
51877
a
b
c
b
a-V-Blocks
b-Bearing Surfaces
c-Measure with Dial Indicator at This Point

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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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