Ski-Doo Formula S 1998, Shop Manual

Page: 108 / 338

Section 04 ENGINE
Subsection 04 (LEAK TEST AND ENGINE DIMENSION MEASUREMENT)
04-04-11
b. Measure the thickness of each bearing (M
4
and
M
5
).
MEASURING M
4
AND M
5
1. Bearing thickness
c. Measure distance between bearing shoulders
on crankshaft (M
6
).
MEASURING M
6
d. Measure the distance ring (M
7
) and adjustment
shims thickness (M
8
). Add these measure-
ments to obtain dimension B.
e. From dimension A, subtract dimension B.
The result is the actual crankshaft end-play that
must be within specification.
If the result is over specification, add adjustment
shim(s) to reach this specification.
If the result is under specification, remove adjust-
ment shim(s) to reach this specification.
To Summarize
A = M
1
+ M
2
+ M
3
B = M
4
+ M
5
+ M
6
+ M
7
+ M
8
A – B = Actual end-play that must be within spec-
ification.
M
8
is the dimension that must be adjusted to ob-
tain the specified crankshaft end-play.
1. End-play is adjusted with shims
2. PTO
3. MAG
377, 443, 503 Engine Types
End-play is not adjustable but it should be be-
tween 0.10 - 0.30 mm (.004 - .012 in).
CHECKING SURFACE FLATNESS
Intake manifold, intake manifold cover, rotary
valve cover can be checked for perfectly mating
surfaces.
Lay part on a surface plate (marble, mirror or thick
glass plate).
Holding down one end of part, try pushing down
the other end.
If any play is felt, part must be rectified.
A01C0UA
1
A02C0LA
A
M
3
M
2
M
1
3 2
1
M
4
M
5
M
6
M
7 M 8
B
A01C0WA