G424 Service Manual Adjustment and Troubleshooting190
Piston ring gaps in improper positions –Adjust ring gap positions.
Piston rings or ring grooves worn or rings –Replace piston or rings.
seized in grooves
Carbon deposit in oil return hole of oil ring –Replace rings.
Worn piston and cylinder –Rebore and hone cylinder and install
oversize piston.
Excessive quantity of oil in oil pan –Oil quantity: 4.0 liter (1.1 U.S. gal).
Oil working its way down
Worn valve stem and valve guide –Replace valve and guide.
Defective valve stem oil seal –Replace oil seal
Excessive oil clearance due to worn –Replace bearing.
crankshaft bearing
Fusion in crankshaft bearing –Replace bearing and check lubrication
system.
Worn connecting rod bearing –Replace bearing.
Bent connecting rod –Repair bent connecting rod or replace.
Fusion in connecting rod bearing –Replace bearing and check lubrication
system.
Excessive clearance due to worn cylinder –Rebore and hone cylinder and install
oversize piston.
Worn piston or piston pin –Replace piston and piston pin.
Piston seizure –Replace piston.
Broken piston ring –Replace piston ring.
Excessive camshaft end play –Replace camshaft thrust plate.
Worn crankshaft thrust bearing –Replace bearing.
Worn timing gears –Replace.
Excessive valve clearance –Cleaned or replace auto-lash adjuster.
Oil working its way up
Excessive oil
consumption
Excessive engine
noise
Engine
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