Cylinderhead Description; Camshaftcover - Triumph DAYTONA 675 Service Manual

Cylinder Head 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 and various
components are permanently added after machining.
The camshafts run directly in the head without separate
bearings. Valve clearances are adjusted by changing
variable thickness shims which sit between the valve
tappet bucket and the valves.
The camshafts are driven by a silent-type chain. The chain
is guided by two blades and is tensioned by a spring
loaded tensioner for Street Triple, Street Triple R and
Daytona 675 up to VIN 381274.
For Daytona 675 from VIN 381275 a hydraulic tensioner
is fitted to tension the chain. The Hydraulic tensioner is
fed oil via a gallery in the cylinder head. The combination
of oil pressure and spring pressure pushes the plunger
against the tensioner blade which tensions the camshaft
drive chain. The hydraulic tensioner has an oil pressure
relief valve located in the plunger that is set to open
between 12 - 16 bar and when opens sprays oil through a
drilling in the tensioner blade onto the camshaft drive
chain.
Oil is supplied to the head by an internal gallery. Once
supplied to the head, the oil is distributed along internal
drillings within the head casting and camshaft.
Single valve springs are used to close both the inlet and
exhaust valves. These valve springs have close wound
coils at one end to assist in the prevention of valve bounce
at high engine speed and to give a smooth valve
actuation. When assembling the cylinder head it is
i mportant that the close wound, colour coded ends of the
springs are fitted downwards (towards the piston). The tip
of the inlet valves are hardened to give a long service life.
Due to the methods used to assemble the valve seat and
valve guides to the head, these parts cannot be replaced.
A d
In any of the following operations which necessitate the
removal or disconnection of the camshaft drive chain,
NEVER turn the engine without the camshaft drive
chain and tensioner correctly fitted and adjusted. In the
disassembled condition, the pistons will contact the
valves if the crankshaft is turned, causing severe engine
damage.
Service Manual - Daytona 675, Street Triple and Street Triple R
I UMP
Camshaft Cover
Removal
Remove the rider's seat (see page 16- 17).
2. Disconnect the battery, negative (black) lead first.
3. Daytona 675 only: Remove the lower fairings (see
page 16-20).
4. Remove the fuel tank (see page 10-89).
5. Remove the airbox (see page 10-95).
6. Remove the ignition coils from the camshaft cover.
1. Ignition coils
7. Detach the secondary air injection hose from the
reed valves on top of the camshaft cover (see page
10-135).
1. Spring-close hose clip
2. Secondary air injection hose
3. Reed valve assembly
Cylinder Head
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