PART NUMBER | TOOL NAME |
HD-35667-A | CYLINDER LEAKDOWN TESTER |
The cylinder leakage test pinpoints engine problems including leaking valves, worn, damaged or stuck piston rings and blown head gaskets.
Use CYLINDER LEAKDOWN TESTER (Part No. HD-35667-A). Follow the specific instructions supplied with the tester.
1. Run engine until it reaches normal operating temperature.
2. Clean around spark plug base. Remove spark plugs.
3. Remove the air cleaner and set the throttle in the wide open position.
4. Rotate the piston to TDC of the compression stroke (both valves closed).
5. To keep the crankshaft from turning when air pressure is applied to the cylinder, engage transmission in fifth gear and lock the rear brake.
Note. Before performing the cylinder leakage test, verify that the tester itself is free from leakage. Apply a soap solution around the tester fittings. Connect the cylinder leakdown tester to the compressed air source. Look for any bubbles that would indicate leakage from the tester.
6. Following the manufacturer's instructions, perform a cylinder leakage test. Make a note of the percent of leakage. Leakage greater than 12 percent indicates internal engine problems.
7. Listen for air leaks at induction module intake, exhaust pipe and head gasket.
- a. Air escaping through the induction module indicates a leaking intake valve.
- b. Air escaping through the exhaust pipe indicates a leaking exhaust valve.
Notes:
- If air is escaping through valves, check pushrod length.
- Complete the cylinder leakage test(s). Install the spark plugs. Verify that the throttle plate is in the closed position before starting the engine.