D-MOTOR LF39 - Engine Runs Erratic or Misfires Occasionally; Engine Overheats, Oil Temperature over 100 Deg.C (212 Deg.f)

The Light Weight Engine Houtekietstraat 11
B-8540 Deerlijk, Belgium
EFFECTIVITY page 40
ALL 19-3-2019
Cause
Action
Intake manifold leaky
Tighten all intake connections.
Replace any defective parts.
Engine runs erratic or misfires occasionally
Cause
Action
Spark plug failure
Clean plugs inside and outside.
Replace if necessary.
Ignition wire breaks down
Check ignition wire and replace if necessary.
Ignition troubles
Check complete ignition system and replace
parts if necessary.
Fuel filter blocked (fuel pressure indicator below
2,5 Bar)
Disassemble and replace the filter.
Engine overheats, Oil temperature over 100 Deg.C (212 deg.F)
Cause
Action
Too much oil remaining in the crankcase
Check the oil return line
Insufficient air-flow to the oil cooler
Check and clear the air passages.
Insufficient oil supply
Check oil level and fill if necessary.
Poor oil quality
Change oil. Use prescribed oil.
Oil filter blocked
Change the oil filter.
Defective oil temperature gauge
Replace the oil temperature gauge.
Excessive piston ring gas leakage (blow by)
Major overhaul is necessary.
Bearings defective
If there is metal contamination in the crankcase
sump, a major overhaul is necessary.