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: 69 of 116
L:\files\Manuals_For_Products\Engine_Manuals\Transition\JEM2204-9_I&M_unsigned.docx
Figure 35. Drawing 9432064
– Timing Gear Alignment
Note: Timing marks on cam gear are on 2 teeth. Crankgear marked on one tooth.
2. Mount a dial indicator on cylinder with the plunger on the center of the piston.
3. Zero the indicator at T.D.C.
4. Fix a wire pointer of the oil seal bolt hole and roughly set to T.D.C.
5. Turn 1/4 turn backwards then forward until the piston is 2mm from T.D.C. Note
degrees.
6. Turn past T.D.C. to 2mm down from T.D.C. Note degrees.
Add two together then divide by 2 and set pointer at this (with piston down 2mm)
Note: The crank is mounted to turn the engine in direction of rotation. Turn
crankcase anti clockwise when viewed from rear.
7. Repeat again to check.
Note: It is important to find T.D.C. accurately as it is the datum for setting the cam
timing and ignition timing.
8. Set dial indicator up to measure lift on No. 1 exhaust. Set to 0 on max lift.
9. Turn 1/4 turn backwards then turn until 0.5mm (0.020") from peak. note
degrees, continue turning until 0.5mm (0.020") after peak.
Note: Always turn in direction of rotation to eliminate back lash in gears.
10. Calculate total degrees and divide by 2 to find peak. Peak should be 70o-72o
after B.D.C.
11. The cam shaft gear has 22 teeth and 6 bolt holes, so if it needs adjusting.
Move the gear around and re check. Record final measurement in build sheet.