85-Maintenance Procedures
(a) Prepare for timing chain and camshaft chain wheel replacement
To get access to the chain drive, do the following steps.
Remove the intake air hoses.
Refer to the applicable Aircraft
Maintenance Manual.
Remove the wiring harness.
Refer to Section 71-50-00 Paragraph
2.E.
Remove the plugs connected to the engine
components that must be removed.
Remove the cable retainers with a
nipper to loosen the cables.
Remove the injector cover.
Refer to Section 85-10-00 Paragraph
3.B.
Refer to Section 73-10-01 Paragraph
A.
Identify each injector and fuel line with the cylinder number to prevent
incorrect installation.
Put the injectors in plastic bags to prevent contamination with dust.
Remove the cylinder head cover.
Short screws are identified with “S”
Long screws are identified with “L”
Refer to Fig. 85 - 142.
Remove the turbocharger oil supply line.
Refer to Section 79-20-00 Paragraph
8.A.
Remove the turbocharger oil return line.
Refer to Section 79-20-00 Paragraph
9.A.
Remove the camshaft sensor housing.
Refer to Section 85-30-00 Paragraph
4.A.(c) Step (2) thru (5).
Do not tilt the cover whilst when you remove it.
Do not damage the drain plug. Refer to Fig. 85 - 143.
Remove the front side cover E4A-14-000-000.
Loosen the five screws on the front
side cover of the cylinder head.
Remove the camshaft bearing shell from the
intake camshaft on the timing chain side.
Replace the camshaft bearing shell with a
chain guiding bar.
To prevent small parts from getting into the chain slot, use a rag as a cover for
the slot.
Make sure that the chain does not move from the chain wheel.
To hold the chain in position at the camshaft,
attach the chain to the chain wheel with a
cable retainer.
Make sure the position of the cable
retainer is at 11 o’clock position of
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