Valve Clearances; Valve Clearance Adjustment; Cylinder Head - Triumph Rocket III Classic Service Manual

Valve Clearances
camshaft valve, valve shim and valve seat wear affect the
valve clearances. The effect of this wear is to change the
clearance between the camshaft and the adjustment shim,
causing engine noise and/or improper running. If the
valve clearances are incorrect, permanent damage to
components in the valve-train will take place and engine
performance will be affected.
Correct valve clearances are in the range given in the
table below.
Inlet 0.10 to 0.15 mm
Exhaust 0.15 to 0.20 mm
Note:
• Valve clearance adjustment must be carried
out with the engine cold.
1. Remove the camshaft cover (see page 3-5>.
2. Remove a spark plug from each cylinder to reduce
compression resistance when turning the engine.
3. Select a high gear and, using the rear wheel, turn the
engine over until a pair of camshaft lobes are
positioned pointing directly away from the valves.
4. Using feeler gauges, measure and record the
clearances for this pair of valves only.
5. Repeat the process until the clearances for all valves
have been checked.
If any of the recorded clearances fall outside the
specified range, adjustments must be made. If all
measured clearances are within tolerance, refit the
camshaft cover (see page 3-6).
Cylinder Head
Valve Clearance Adiustment
Note:
•
1.
Valve clearance checking and adjustment must
be carried out with the engine cold.
Measure and record all valve clearances as described
previously.
2. Remove the camshafts (see page 3-14).
3.
Remove a shim from one of the valves whose
clearance required adjustment.
4. Measure the original shim, using a micrometer.
5.
Calculate the shim thickness required to give the
correct clearance. Clearance too small; fit a thinner
shim. Clearance too large; fit a thicker shim.
Note:
•
6.
Shims are available ranging from 2.00 mm to
3.20 mm in increments of 0.025 mm.
Fit the selected shim to the tappet bucket.
Z Repeat the procedure until all valves requiring
adjustment have been correctly set.
8. Refit the camshafts (see page 3-17>.
9. Rotate the engine several times to fully seat the
shims.
10. Repeat the clearance checks on all valves, adjust as
necessary.
11. Refit the camshaft cover (see page 3-6).
Service Manual - Rocket Ill/ Classic / Touring
3.19