D-MOTOR LF39 - Excessive Oil Consumption; Engine Knocks; Engine Hard to Start at Low Temperatures

The Light Weight Engine Houtekietstraat 11
B-8540 Deerlijk, Belgium
EFFECTIVITY page 42
ALL 19-3-2019
Idle speed to high
Adjust proper idle speed
(800 r/min) (1010 r/min for helicopters)
Ignition switch defective
Replace the switch.
Excessive oil consumption
Cause
Action
Piston rings or oil scraper rings worn
A major overhaul is necessary
Poor oil quality
Change oil. Use prescribed oil.
Worn valve guides or bad valve guide seals
A top overhaul is necessary.
External oil system leaky
Check for defects and correct as necessary.
Engine « knocks »
Cause
Action
Using fuel with a low octane rating
Use fuel with a higher octane rating.
Engine hard to start at low temperatures
Cause
Action
Low battery charge
Replace battery or recharge.
High oil pressure
During a cold start a pressure reading up to 100
psi (7bar) is permissible