Through Bolt And Stud Bolt Torque Check - Jabiru 2200 Maintenance Manual

Engine Maintenance Manual
JEM0005-1
9.2

Through bolt and stud bolt torque check

Required Tools:
Parts and Material:
Type of Maintenance:
Level of Certification:
Return to Service:

A through bolt torque check is only required if the previous visual inspection conducted in section 8.15
indicated that they may have moved or lost tension.

Set a torque wrench to the prescribed through bolt / stud bolt installation torque setting (refer to
JEM0004).

Click off each through bolt nut at this torque setting in the tightening direction.

If through bolts click off at the required torque setting without movement it indicates no loss of bolt
tension, renew any broken or missing torque seal to these bolts.
o
Some though bolts may relax slightly, particularly during the initial life of the engine (within
the first 100 hours or so) as the cylinder heads, and barrels settle slightly. This would be
indicated by slight movement of the nut no more than 1/8
o
The location and degree of movement of any through bolts should be noted in the
maintenance log. At the next scheduled maintenance interval a through bolt torque check
should be repeated on all bolts to verify that the bolts have stabilised or if a further issue
exists.
o
If bolt movement is excessive and occurs on most bolts in the engine it may indicate that the
crankcase is fretting (or it may indicate the torque wrench being used is not calibrated
correctly). If fretting is suspected a crankshaft friction test should be conducted (refer to
JEM0004).
This document is controlled while it remains on the Jabiru server. Once this no longer applies the document becomes uncontrolled.
1 2
ISSUE
Jabiru Aircraft
Jabiru 2200 & 3300 Aircraft Engines
Torque wrench
N/A
Line Maintenance
L2 or LAME (A&P or LSA Repairman / Maintenance)
L2 or LAME (A&P or LSA Repairman / Maintenance)
th
25
Dated :
Pty Ltd
th
of a turn. This is not abnormal.
SEP 2018
Issued By: AS Page: 42 of 74