Checking/Adjusting Balance Shaft Belt

CHECKING AND ADJUSTING TIGHTNESS OF DRIVE BELT FOR BALANCE SHAFTS (ROLLER WITH SLOT)

Note: Only check and adjust drive belt tightness on a cold engine (ambient temperature approx. 20° C/68° F).

1. Remove air-cleaner assembly, unbolt and remove engine underguard.

2. Remove poly-rib and servo pump belt.





Note: Always first loosen hex bolts of linkage slightly before unscrewing locknuts.

3. Unscrew vent hose and take off drive belt cover.





4. Slacken pulley so that it no longer tensions drive belt.

8 Valve Engine:

16 Valve Engine:

5a. Turn crankshaft clockwise until TDC mark on camshaft sprocket is aligned with cast mark in mount for distributor cap.





5b. TDC marks on flywheel and cast clutch housing must also be aligned.

Balance Shaft Timing Marks:

6. Check basic position of balance shaft sprockets. Marks on sprockets should be aligned with marks of rear drive belt cover.

7. Prepare special tool P 9201 for testing. Pull out lockpin on special tool and push gauge pin opposite the lockpin out as far as it will go. Zero telltale needle.





8. Slide special tool on to belt. Push in gauge needle (arrow) until lockpin is heard to engage and read value from dial gauge.

Note: Always zero telltale needle on gauge after lockpin has engaged (turned anticlockwise) to exclude wrong gauge readings.

Specifications: 2.7 ± 0.3 dial value
If necessary, correct belt tightness.

Adjusting





9. Turn tensioning roller clockwise to increase tension. Turn anti-clockwise to slacken. Tighten hex nut to 45 Nm (33 ftlb) while countering.





10. After adjusting drive belt tension, adjust idler pulley. Use special tool 9207 or 0.5 mm feeler gauge so there is a clearance of 0.5 mm between drive belt and pulley when 0 to 1 mm pretension is applied to upper run of toothed belt. Tighten idler pulley in this position. If correct gap cannot be reached, turn idler pulley 180° and repeat adjustment. Tighten hex nut to 45 Nm (33 ftlb) while countering.

11. Install Poly-Rib belt and adjust; Adjustments

Note: Slides must make full-surface contact with belt. While measuring, do not allow the Special Tool to turn or move on the belt.