Component Tests and General Diagnostics

CHECKING AND ADJUSTING TIGHTNESS OF CAMSHAFT DRIVE BELT

Note: The tightness of the drive belt must only be checked and adjusted on a cold engine (room temperature).





1. Turn crankshaft clockwise slowly until TDC mark on camshaft sprocket is aligned with cast mark in console for the distributor cap.

Note: Check drive belt for wear and damage at same time while turning.

Crankshaft Timing Marks:

2. TDC mark on flywheel and cast boss on clutch housing must also be aligned.

3. Turn engine on crankshaft anticlockwise approx. 10° on crankshaft, which is equal to about 1.5 teeth toward mark on the camshaft sprocket.

4. Prepare Special Tool 9201 for checking. Pull out lockpin on special tool and push out test pin opposite the lockpin completely. Align drag needle with gage needle.





5. Slide special tool on to drive belt. Press in test point (arrow) slowly until lockpin is felt to engage and read displayed value from the dial gage.

Note: Always line up the drag needle and gage needle after engagement of the lockpin to exclude incorrect display (by turning anticlockwise).

Adjusting Value:
Scale Value:
New belt: 4.0 ± 0.3
Used belt: 2.7 ± 0.3

Control Value:
up to about 3,000 km 2.4 to 4.3
more than 3,000 km 2.7 ± 0.3

Correct drive belt tightness if necessary.

Note: Sliding shoes must have complete contact on surface of drive belt. The special tool must not be turned nor moved on the belt while checking.

6. Turn the tensioning roller anticlockwise while tightening.
Turn the tensioning roller clockwise while loosening.

Tensioning Belt:

7. Tighten mounting nuts with specified torque while counterholding.

8. Turn engine clockwise two complete turns and align TDC mark on camshaft sprocket with cast mark in console for distributor cap. Turn engine anticlockwise approx. 10 crankshaft degrees from this position.

9. Recheck tightness of drive belt and, if necessary, correct.