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HEAD-CYLINDER-LEFT DESCRIPTION - VALVE GUIDES The valve guides are made of powered metal and are pressed into the cylinder head. The guides are not replace- DIAGNOSIS AND TESTING DIAGNOSIS AND TESTING - HYDRAULIC LASH ADJUSTER A tappet-like noise may be produced from several items. Check the following items. 1. Engine oil level too high or too low. This may cause aerated oil to enter the adjusters and cause them to be spongy. 2. Insufficient running time after rebuilding cylinder head. Low speed running up to 1 hour may be required. 3. Turn engine off and let set for a few minutes before restarting. Repeat this several times after engine has reached normal operating temperature. 4. Low oil pressure. 5. The oil restrictor in cylinder head gasket or the oil passage to the cylinder head is plugged with debris. 6. Air ingested into oil due to broken or cracked oil pump pick up. 7. Worn valve guides. 8. Rocker arm ears contacting valve spring retainer. 9. Rocker arm loose, adjuster stuck or at maximum extension and still leaves lash in the system. 10. Oil leak or excessive cam bore wear in cylinder head. 11. Faulty lash adjuster. a. Check lash adjusters for sponginess while installed in cylinder head and cam on camshaft at base circle. b. Remove suspected lash adjusters, and replace. c. Before installation, make sure adjusters are full of oil. This can be verified by little plunger travel when lash CYLINDER HEAD GASKET A cylinder head gasket leak can be located between adjacent cylinders or between a cylinder and the adjacent Possible indications of the cylinder head gasket leaking between adjacent cylinders are: • Loss of engine power • Engine misfiring • Poor fuel economy Possible indications of the cylinder head gasket leaking between a cylinder and an adjacent water jacket are: • Engine overheating • Loss of coolant • Excessive steam (white smoke) emitting from exhaust • Coolant foaming CYLINDER-TO-CYLINDER LEAKAGE TEST To determine if an engine cylinder head gasket is leaking between adjacent cylinders, follow the procedures in Cyl- 9 - 1474 ENGINE - 3.7L KJ |