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Description
The engine is fitted with an aluminium alloy cylinder head,
which carries the camshafts, valves and spark plugs. The
cylinder head is cast as a single entity, to which various
components are permanently added after machining.
A silent-running camshaft drive chain drives the twin-
overhead camshafts, which run directly in the cylinder
head without additional bearings. The chain is tensioned
by a spring-loaded device fitted to the cylinder head, and
is guided by two Teflon-coated rubber-faced blades. Valve
clearances are adjusted by changing variable thickness
shims that sit between the camshaft and valve tappet
bucket. The valves are fitted with single, symmetrical valve
springs. Both the tip and seat face of the valves are
hardened to give a long service life. Due to the assembly
methods used, the valve seats and valve guides cannot be
replaced.
Oil is supplied to the cylinder head by an internal
passageway inside the engine. Once it arrives at the
cylinder head, it is passed through a restrictor, and is then
delivered to the camshaft bearing journals along grooves
in the camshaft ladder. The camshaft lobes are splash fed
by oil coming from the camshaft journals.
Camshaft Cover
Before starting work, ensure the motorcycle is stabilised
and adequately supported. This will help prevent it from
falling and causing injury to the operator or damage to
the motorcycle.
Removal
1.
Remove the seat (see page 17-17 for Rocket III and
Classic, see page 17-18 for Rocket III Touring).
2.
Disconnect the battery, negative (black) lead first.
3.
Remove the fuel tank (see page 11-149 for Rocket III
and Classic, see page
11-153
for Rocket III Touring).
4.
Remove the throttle bodies (see page 11-188>.
Cylinder Head
5.
Remove the intake duct support bracket.
®
1. Bolts
2. Intake duct support bracket
6.
Disconnect the spark plug leads from the spark plugs
then remove the coil brackets with the coils attached.
Z
Remove the bungs from the heads of the camshaft
cover fixings.
8.
Release the bolts securing the camshaft cover to the
head.
cbpo
1. Camshaft cover
2. Camshaft cover bolts
3. Bolt seals
9.
Remove all the bolts and bolt-seals from the
camshaft cover.
10. Raise the cover and manoeuvre it towards the right
hand side of the engine, where it can be removed.
Never use a lever to remove the camshaft cover from
the cylinder head. Using a lever will cause damage to
the cylinder head and camshaft cover, which could lead
to an oil leak.
11. Collect the seal from the head.
SelVice Manual - Rocket Ill/ Classic / Touring
3.5
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