Knocks at Idle Hot. Opel Sintra 1997

For 1990-2009 cars

• | Inspect the drive belt for wear. Check the drive belt and the drive belt tension. Replace the component(s) as necessary.

• | Inspect the A/C compressor or the generator bearing. Replace or repair the components as necessary.

• | Inspect the valve train. Replace the components as necessary.

• | Inspect for improper oil viscosity. Install proper viscosity oil for expected temperature. Refer to Maintenance and Lubrication for the engine oil specifications.

• | Inspect for excessive piston pin clearance. Replace the piston and pin as necessary.

• | Inspect the connecting rod alignment. Check and replace the connecting rod(s) as necessary.

• | Inspect for insufficient piston-to-bore clearance. Hone the bore and fit the new piston.

• | Inspect the crankshaft balancer for looseness. Tighten the component fastener(s) to specification and/or replace the worn component(s).

• | Ensure that the piston pin is not offset to the wrong side. Install the piston in the correct orientation.

• | Ensure that the camshaft drive gear backlash is not excessive. Knock will also be heard on a cold engine.