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Jabiru Aircraft
Pty Ltd
Instruction & Maintenance Manual
Jabiru 2200 Aircraft Engine
Hydraulic Valve Lifter Models
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REVISION
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Dated : June 2010
Issued By: DPS
Page: 110 of 116
L:\files\Manuals_For_Products\Engine_Manuals\Transition\JEM2204-9_I&M_unsigned.docx
14.1.9
Knocking Under Load
Possible Cause
Remedy
1)
Octane rating of fuel too low
Use fuel with higher octane rating
2)
Spark plug fitted without sealing washer
Ensure one sealing washer on each plug
3)
Heavy carbon deposits
Remove cylinder heads & in combustion
chamber remove deposits. Determine oil
consumption.
Notes:
-
Running this engine on low octane fuel will cause piston damage and in extreme cases
failure of the top ring gland or holed piston due to detonation.
-
Changing the engine tuning to a leaner air fuel mix can cause piston damage.
14.1.10
Engine Hard to Start at Low Temperature
Possible Cause
Remedy
1)
Starting speed too low
Preheat engine
2)
High oil pressure
At very low temperatures, a pressure
reading of up to around 500 kpa doesn't
necessarily indicate a malfunction
3)
Low battery charge
Fit fully charged battery
14.1.11
Hydraulic Valve Lifters
Symptoms
Possible Cause
Remedy
1)
Engine noisy, “tapping” at idle
“Soft” lifter(s) due to lifter fault
Replace lifter(s)
“Soft” lifter(s) due to low oil
pressure
See Low Oil Pressure section
above.
“Soft” lifter(s) due to air in lifter
Run engine. Up to 15 minutes
running may be required to
completely expel air from the
lifter.
OR
Remove lifter and manually fill
with oil.
2)
Reduced engine power
Soft or stuck hydraulic lifter(s)
Replace lifter(s)
“Soft” lifter(s) due to low oil
pressure
See Low Oil Pressure section
above.
Lifters “pumping up” holding
valves open
Reduce operating oil pressure
(within limits)
Replace lifter(s)
3)
Excess metal in oil filter
Cam / Lifter damage
Inspect lifter and cam working
surfaces. Replace if damaged.
Notes:
-
Refer to Section 6.8 for additional details on hydraulic lifter maintenance requirements.