Knocks Cold and Continues For Two to Three Minutes

- Flywheel contacting splash shield. Reposition splash shield.
- Loose or broken balancer or drive pulleys. Tighten or replace as necessary.
- Excessive piston-to-bore clearance. Replace piston.
- Bent connecting rod.
- Cold engine piston knock usually disappears when the cylinder is grounded out. Cold engine piston knock which disappears in 1.5 minutes should be considered acceptable.