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Engine Overhaul Manual
Jabiru Aircraft
Pty Ltd
Jabiru 2200 & 3300 Aircraft Engines
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ISSUE
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6 7
Dated : 28/10/2014
Issued By: AS
Page: 66 of 201
L:\files\Manuals_For_Products\Engine_Manuals\Overhaul_Manual\JEM0001-7_Overhaul_Manual_DRAFT_(29_10_14).docx
Figure 73
– Main Bearings
5.10.2 Hydraulic Valve Lifters
5.10.2.1 Mandatory Updates
None for engines with solid valve lifters.
5.10.2.2 Mandatory Discard
All Hydraulic valve lifters must be replaced at 1000 hours total time in service.
5.10.2.3 Cleaning
– Hydraulic Lifters
If required, the hydraulic lifters can be dismantled and cleaned quite simply using a solvent such as
kerosene. However, extreme care is needed to make sure that each lifter is re-assembled correctly.
The lifters contain many small parts which must be oriented correctly for the valving of the lifter to work.
Note also that different lifters often have subtly different internal parts. Generally, as the lifters are
relatively cheap, it is preferable for the overhauler to fit new parts instead of cleaning the old lifters.
The base of the inside of the lifter tends to accumulate sludge and must be cleaned if it is to be re-used.
Lifters must be cleaned and dried thoroughly before re-installation.
The upper two bearing shells show severe wear. With wear
this severe Babbit material would have been visible in the
element during an oil filter inspection.
Damage of this sort can be caused by dirty oil, the loss of oil
pressure, use of automotive oil, oil additives or long-term
operation with excessive oil temperatures.
Uneven wear, with the Babbit material exposed.
Normal wear
– very little visible wear.