Cagiva Navigator, Workshop Manual

Page: 208 / 407

D.90
ENGINE
CAMSHAFTS
If abnormal engine noise, vibration or lack of power output is no-
ticed, all camshafts should be checked for signs of runout and wear
of the cams and journals. Any of these conditions may occur if the
camshafts have become worn or distorted beyond the service limit.
The camshafts differ in shape, and are identified by engraved let-
ters.
1 No. 1 (front) exhaust camshaft
2 No. 1 (front) intake camshaft
3 No. 2 (rear) intake camshaft
4 No. 2 (rear) exhaust camshaft
Identify the exact location of each removed component. Sort
the parts into groups designated as “No. 1”, “No. 2”, “Ex-
haust”, “Intake”, etc., so that each part can be restored to
its original position during reassembly.
CHECKING AND SERVICING THE CAMSHAFTS AND THE CYLINDER
HEAD
CAM WEAR
Worn-out cams are often the cause of mistimed tappet operation
and reduced power output.
The limit of cam wear is specified for the intake and exhaust cams in
terms of cam height H, to be measured with a micrometer. Replace
the camshafts if the cams are worn beyond the specified limit.
Specific tool: Micrometer (25-50 mm, 0.984-1.968 in)
Service limit
Cam height H
Intake cams Exhaust cams
37,47 mm 36,08 mm
(1.475 in) (1.420 in)
A
A
1
2
3
4
1
2
3 4
“E”
“I”
“E”