Engine Maintenance Manual
Jabiru Aircraft
Pty Ltd
JEM0002-5
Jabiru 2200 & 3300 Aircraft Engines
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ISSUE
1
2
3
4
5
Dated : 2nd June 2015
Issued By: AS
Page: 66 of 103
L:\files\Manuals_For_Products\Engine_Manuals\Engine Maintenance Manual 22 & 33\JEM0002-5.docx
Figure 38
– Tacho Sender #2
9.15
Head Bolt Tension Check
Required Tools:
Allen keys
Torque wrench
Parts and Material:
Thread lubricant
Replacement screws (if required)
Type of Maintenance:
Heavy Maintenance
Level of Certification:
L2 or LAME (A&P or LSA Repairman / Maintenance)
Return to Service:
L2 or LAME (A&P or LSA Repairman / Maintenance)
Remove the air ducts to allow access to the cylinder heads. Note that ducts do not need to be
completely removed from the engine
– for example, on current model Jabiru Aircraft the
retaining screws and springs are disconnected, the high tension leads disconnected from the
spark plugs and the ducts may be swung away to allow access.
Remove the rocker covers and the 1/8 NPT plug which gives access to the lower head bolt
(see at the location indicated as bolt #5 in Figure 39).
If the engine has been operating in a corrosive environment (such as coastal areas) it is
possible for the cylinder head screws to rust in place. In these applications it may be
necessary to loosen head screws by approximately ¼ of a turn to check for rust before re-
applying screw torque. Where a screw is loosened and re-tightened the screw must be set to
the “new installation torque” given in Table 10. Note any excessively loose screws.
When screws are not loosened before re-
torquing they are checked to the “subsequent check”
torque value noted in Table 10.
When fitted, head screws are lubricated with a suitable thread lubricant. Note that this is
applied to the threads only (not the head of the screw) and to the torque settings given are
therefore still considered to be a “dry” torque. In corrosive environments it is recommended to
periodically remove the screws, inspect and re-apply thread lubricant. Excessively corroded
screws must be replaced with new approved parts.
