30/ENGINE - WORK ON THE INDIVIDUAL PARTS
141
–
Change the piston ring.
–
Mount the piston ring with the marking facing toward the piston head.
20.17
Changing the camshaft bearing
302705-10
–
Clamp special tool
1
into a vise.
Adjustment bush bridge (77229050000) (
–
Mount the camshaft on the special tool.
–
Remove screw
2
.
302767-10
–
Pull camshaft gear
3
off of the camshaft.
Extractor, camshaft gear (77229001044) (
–
Remove bearing
4
.
–
Oil the new bearing
4
and push it onto the camshaft.
Lubricated with engine oil
–
Degrease the cone of the camshaft and camshaft gear.
–
Mount camshaft gear
3
.
302705-11
–
Mount screw
2
but do not tighten yet.
Guideline
Screw, camshaft drive
sprocket
M12x1
80 Nm
(59 lbf ft)
Loc-
tite
®
243™
/cone
degreased
–
Repeat these steps for the second camshaft.
20.18
Checking the camshafts
302713-10
–
Check the camshaft for damage and wear.
» If there is damage or wear:
–
Change the camshaft.
–
If the surface of the cams is damaged, check the oil supply to the camshaft
and cam lever.
–
Check the autodecompressor for damage and wear.
» If there is damage or wear:
–
Change the exhaust camshaft.
–
Slide the camshaft bearing to the camshaft gear.
–
Pull lever
1
away from camshaft and release it.
» If the lever does not return to its original position:
–
Change the exhaust camshaft.
20.19
Checking the pivot points of the camshafts
302709-10
–
Check the pivot points of the camshafts.
» If there is damage or wear:
–
Change the cylinder head with the camshaft bearing bridge.