Perkins 2800 Workshop Manual page 56

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8 Insert the engine turning tool, CH11148, into the flywheel housing through the aperture behind the cover
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(A2). Use a / inch drive ratchet with the turning tool to rotate the engine flywheel in the normal direction of
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rotation (anti-clockwise when viewed on the flywheel) until the timing bolt engages with the threaded hole in
the flywheel. The piston of number 1 cylinder is now at TDC (top dead centre). When the number one piston
is at top dead centre on its compression stroke, the mark on the camshaft gear is be aligned with the mark on
the gear case. If the mark is not aligned, withdraw the timing bolt, rotate the crankshaft a further 360 degrees
in the normal direction of rotation and insert the timing bolt again.
Cautions:
l If the flywheel is turned past the threaded hole, the flywheel must be turned in the opposite direction for
approximately 45 degrees and then back in the normal direction of rotation until the timing bolt engages
with the threaded hole. This is to eliminate backlash.
l Do not rotate the crankshaft with the camshaft gear or any of the idler gears removed and the rocker shaft
assemblies installed. Damage can be caused to the pistons and valves, or to both.
9 Disconnect the lead and remove camshaft timing sensor from behind the top of the gear case.
10 Remove one bolt from the camshaft gear and install the guide stud, GE50019. Remove the five bolts which
remain.
11 Attach a hoist to the camshaft gear and withdraw the gear from the camshaft. Remove the guide stud.
12 Remove three bolts and withdraw the thrust plate, the adaptor plate and the seal assembly.
Note: Take care during removal of the camshaft to ensure that the surfaces of both the camshaft and the
camshaft bearings are not damaged. Use the procedure which follows, together with the relevant special tools,
to avoid damage to the engine and components.
13 Use the bolts of the rocker shaft to retain the cradle tool (B1), GE50018, at the position shown (B).
46 Workshop Manual, TSD3450E, Issue 1
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