Jabiru Aircraft
Pty Ltd
Instruction & Maintenance Manual
Jabiru 2200 Aircraft Engine
Hydraulic Valve Lifter Models
This document is controlled while it remains on the Jabiru server. Once this no longer applies the document becomes uncontrolled.
REVISION
0
1
2
3
4
5
6 7
8
9
Dated : June 2010
Issued By: DPS
Page: 31 of 116
L:\files\Manuals_For_Products\Engine_Manuals\Transition\JEM2204-9_I&M_unsigned.docx
Figure 6 above shows the High-Tension lead connections between the distributors and the
spark plugs.
6.5.2
Spark Plugs
Do not use steel or brass brushes for cleaning & never sandblast plugs.
Clean with plastic brush in a solvent.
Check electrode gap & if necessary, adjust to 0.55 - 0.6mm (0.022" - 0.024") by
carefully bending the electrode.
Recommended Plugs: NGK D9EA.
Use suitable anti-seize on thread.
IMPORTANT
Only tighten spark plugs on cold engine & only to the torque values shown in Section 9
using appropriate anti-seize compound
Note: When plugs are removed from a warm engine, the inspection of the tip of the spark
plug can be used to indicate the health of the engine:
Brown to Dark Brown
:- Plug & calibration is correct.
Velvet Black
:- Mixture too rich. Check choke. Insufficient air intake. Check for
clogged air filter.
Oily, Glossy Coating
:- Misfiring. Too much oil in combustion chamber. Worn
cylinder & piston rings.
Whitish with Melt Droplets
:- Mixture too lean. Leaking valves.
CAUTION: This guide is only relevant when running the engine on AVGAS.
Unleaded fuels give different plug colours which are generally unsuitable for use in
evaluating engine tuning.
6.6
Exhaust System
Visual check for damage, rubbing, leaks & general condition.
6.7
Bolts and Nuts
Check for tightness, re-torque if necessary (see Section 9).
6.8
Tappet Adjustment / Hydraulic Valve Lifters
The Hydraulic Valve Lifters used in the engine automatically adjust for any valve
movement, so periodic adjustment of the valve clearances is not required, however the
valve lifters are a serviceable item and some monitoring is required to ensure they are
working properly.
