Camshaft Drive Belt - Noise at 1800 RPM

9234porsche01

August 4, 1992




Model
944 S2


Part Identifier
1524


Group
1


Number
9208


Subject:
Camshaft Drive Belt Noise


ATTENTION:
Service Manager/Service Technician

Models Affected:
944 S2 from M. Y. 1989-1991

Concern:
Camshaft belt noise noticeable at approximately 1800 RPM with engine at operating temperature.

General Information:
Oscillations in the camshaft drive belt occuring between the crankshaft and the cam belt tensioning roller can create noise with the engine at operating temperature and engine speed of approximately 1800 RPM. This noise can be effectively reduced or eliminated by adjusting the camshaft belt tension using special tool 9201.

Work Procedure:
Adjustment of the camshaft drive belt is to be performed on a cold engine only.

1. Turn the crankshaft in the clockwise direction until cylinder # 1 is at TDC and the cam gear marking is visible.

2. From this position, turn the crankshaft back approximately 10~ or 1.5 teeth from the marking on the camshaft gear.

3. Loosen the hex nut and bolt of the tensioner and, using special tool 9200, lever back the tensioning arm to reduce the tension slightly.

4. Rotate the crankshaft until the camshaft belt has made two (2) complete revolutions, then return the crankshaft to the position in step 1. Repeat step 2.

5. Using special tool 9201, adjust the camshaft belt tension to scale value 4.0-4.3. Position 9201. Sliding shoes must have complete contact on surface of drive belt. The special tool must not be turned or moved on the belt while checking. After adjustment is complete, torque the hex nut and bolt of the tensioner to 20 N-m (14 ft.lbs.)