EM -20 ENGINE DOHC
TROUBLESHOOTING E6712BDA
Symptom
Probable cause Remedy
Blown cylinder head gasket Replace gasket
W orn or damaged piston rings Replace rings
W orn piston or cylinder
Repair or replace piston and/or
cylinder block
Low compression
W orn or damaged valve seat
Repair or replace v alve and/or
seat ring
Low engine oil level Check engine oil level
Faulty oil pressure switch Replace
Clogged oil filter Replace
W orn oil pump gears or cover Replace
Thin or diluted engine oil Change and determine cause
Oil relief valve stuck (open) Repair
Low oil pressure
Excessive bearing clearance Replace
High oil pressure Oil relief valve sutck (closed) Repair
Loose engine roll stopper (front, rear) Re-tighten
Loose transaxle mount bracket Re-tighten
Loose engine mount bracket Re-tighten
Loose center member Re-tighten
Broken transaxle mount insulator Replace
Broken engine mount insulator Replace
Excessive engine vibration
Broken engine roll stopper insulator Replace
Thin or diluted engine oil (low
oil pressure)
Change
W orn or damaged valve stem
or v alve guide
Replace
Noisy valves
HLA abnormal operation
Speed the engine up (for venting)
or Replace the HLA
Insufficient oil supply Check engine oil level
Thin or diluted engine oil Change and determine cause
Connecting rod and/or main
bearing noise
Excessive bearing clearance Replace
Timing belt noise Incorrect belt tension Adjust belt tension
Leakage of coolant
1. Heater or radiator hose Repair or replace parts
2. Faulty radiator cap Tighten or replace clamps
3. Thermostat housing Replace gasket or housing
4. Radiator Repair or replace
Low coolant level
5. Engine coolant pump Replace parts
Clogged radiator Foreign material in coolant Replace coolant
ZENITH POWER PRODUCTS - 416
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