Inspection - Triumph Rocket III Service Manual

Cylinder Head
1. Cam ladder lightening sequence
i) In the same sequence, torque each cam ladder
bolt to 10 Nm.
j) Release and remove the cam ladder as
previously described.
k) Utilising the gauge provided with the Plastigage
kit, measure the width of the now compressed
Plastigage.
g) Finger-tighten the cam ladder bolts until the
under-head areas are in contact with the cam
ladder.
h) In the sequence shown below evenly and
progressively tighten the cam ladder bolts,
approximately half a turn each, until the cam
ladder is in full contact with the head.
Inspection
1. Inspect the sprockets for damage and worn or
broken teeth.
2. Inspect the bearing surfaces in the cylinder head
and cam ladder. If wear or damage is found, the
cylinder head must be replaced.
3. Inspect the cam chain (see page 3.7).
4. Check camshaft journal to cam ladder clearance
using Plastigage (Triumph part number 3880150-
T0301) as follows:
During the flowing procedure, the engine must not
be rotated. Damage to valves, pistons and the
cylinder head can result from rotating the engine.
a) Position a camshaft to the cylinder head in it's
correct location, (inlet cam to inlet valves,
exhaust cam to exhaust valves). Ensure that the
timing marks on the cam sprocket are positioned
as for removal.
b) Release and remove the cam ladder as
previously described. Wipe the exposed areas of
one of the camshaft journals and the
corresponding position on the cam ladder.
c) Apply a thin smear of grease to the wiped
camshaft journal and a small quantity of silicone
release agent to the corresponding position on
the cam ladder.
d) Size a piece of Plastigage to fit across the wiped
camshaft journal.
e) Fit the Plastigage to the camshaft journal using
the grease to hold it in place.
f) Position the cam ladder to the cylinder head,
aligning bearing areas with cam journals. At this
stage, it is not necessary to fit the cam chain top
pad.
1. Taking a plastigage measurement
5. Calculate the cam journal clearance using the
chart provided with the Plastigage kit.
Service Manual - Rocket
III
3.11