Checking The Camshaft - APRILIA M192M Workshop Manual

ENGINE
3.6.29.

CHECKING THE CAMSHAFT

•
Check that camshaft thrust surfaces are not exces-
sively worn and measure their diameters.
Standard diameter
Thrust surface A (Engines M192M / M245M / M281M /
M234M / M282M) (125 - 200 cc) Ø: 36.95 ÷ 36.975 mm
Thrust surface A (Engine M191M) (150 cc) Ø: 32,459 ÷
32,475 mm
Thrust surface B (Engines M192M / M245M / M281M /
M234M / M282M) (125 - 200 cc) Ø: 19.959 ÷ 19.98 mm
Thrust surface B (Engine M191M) (150 cc) Ø: 19,967 ÷
19,980 mm
Min. allowed diameter
Thrust surface A (Engines M192M / M245M / M281M /
M234M / M282M) (125 - 200 cc) Ø: 36.94 mm
Thrust surface A (Engine M191M) (150 cc) Ø: 32,44 mm
Thrust surface B Ø: 19.950 mm
• Check cam (C and D) heights.
Standard height
C (Engines M192M / M245M / M281M / M234M / M282M)
(125 - 200 cc)=Intake: 30.285 mm
D (Engines M192M / M245M / M281M / M234M / M282M)
(125 - 200 cc)=Exhaust: 29.209 mm
C and D (Engine M191M) (150 cc) = Intake and Exhaust:
27,8 mm
•
Check rocker arm pins for wear and scoring and
measure their diameter.
E (Engines M192M / M245M / M281M / M234M / M282M)
(125 - 200 cc)=Standard diameter: Ø 11,977 ÷ 11,985 mm
E (Engine M191M) (150 cc)= Min. allowed: Ø 11,970 mm
•
Check that the sliding shoe (3) in contact with cam and
shim joint plate (4) are not worn.
•
Check inside diameter (F) of all rocker arms.
F (Engines M192M / M245M / M281M / M234M / M282M)
(125 - 200 cc)= Standard diameter: Ø 12,015 ÷ 12,035 mm
F (Engine M191M) (150 cc)= Min. allowed: Ø 12,030 mm
•
Measure the clearance between the groove and the
retaining plate.
Standard axial play: 0.11÷ 0.41 mm
Max. axial play allowed: 0.42 mm
• Check the groove and the plate for signs of wear.
•
In case of wear or if values are outside the permitted
limit, change faulty parts.
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Engines M192M / M191M / M245M / M234M / M282M / M281M