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Leaking, sticking or broken valves Inspect and/or replace valves External Oil Leakage Fuel pump improperly seated or worn Remove pump, replace gasket and seat properly Oil pan gasket broken or pan bent Straighten pan and replace gasket Timing chain cover gasket broken Replace timing chain cover gasket Rear main oil seal worn Replace rear main oil seal Oil pan drain plug not seated properly Remove and reinstall drain plug Camshaft bearing drain hole blocked Remove restriction Oil pressure sending switch leaking Remove and reinstall sending switch Excessive Oil Consumption Worn valve stems or guides Replace stems or guides, See ENGINES Valve "O" ring seals damaged Replace "O" ring seals, See ENGINES Plugged oil drain back holes Remove restrictions Improper PCV valve operation Replace PCV valve Engine oil level too high Remove excess oil Engine oil too thin Replace thicker oil Valve stem oil deflectors damaged Replace oil deflectors Incorrect piston rings Replace piston rings, See ENGINES Piston ring gaps not staggered Reinstall piston rings, See ENGINES Insufficient piston ring tension Replace rings, See ENGINES Piston ring grooves or oil return slots clogged Replace piston rings, See ENGINES Piston rings sticking in grooves Replace piston rings, See ENGINES Piston ring grooves excessively worn Replace piston and rings, See ENGINES Compression rings installed upside Replace compression rings correctly, See ENGINES Worn or scored cylinder walls Rebore cylinders or replace block Mismatched oil ring expander and rail Replace oil ring expander and rail, See ENGINES Intake gasket dowels too long Replace intake gasket dowels Excessive main or connecting rod Replace main or connecting rod bearings, See ENGINES No Oil Pressure Low oil level Add oil to proper level Oil pressure sender or gauge broken Replace sender or gauge Oil pump malfunction Remove and overhaul oil pump, See ENGINES Oil pressure relief valve sticking Remove and reinstall valve Oil pump passages blocked Overhaul oil pump, See ENGINES
1998 Chevrolet Pickup C1500 GENERAL INFORMATION Trouble Shooting - Basic Procedures
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