
TS, TR, TX engines workshop manual
17
3. Refer to 'Figure 2.12.1' and using a very small amount of
grease place the two pieces of wire on the piston crown.
The wires must be at each side of the gudgeon pin axis and
90° to the centre line and just touching the cylinder bore.
Care must be taken to ensure the wires are not placed over
any markings on the piston crown.
4. Replace the cylinder head.
5. Replace and torque the cylinder head bolts to 61.0Nm
(45.0lbf ft).
6. Turn the piston twice past T.D.C.
7. Remove the cylinder head and measure the thickness of the
lead, this should be:
0.81-0.95mm (0.032-0.037in)
8. If it is necessary to change the shims:
a. Remove the cylinder barrel.
b. Place the necessary shims, dry, onto the crankcase end of
the cylinder barrel.
9. Replace the cylinder barrel and head.
2.13 The Valve Rocker Stub Shafts -
TS/TR
The removal of the stub shafts is necessary when it is required
to examine or change the valves, valve seats, rocker arms or
rocker arm bushes.
Removing Stub Shafts
WARNING
Care must be taken to ensure that any part of the hand
is not likely to become trapped between the two parts of
the tool while it is being used.
1. Screw the small end of the adapter (A) into the screw thread
of the stub shaft and tighten.
T SERIES ENGINES WORKSHOP MANUAL
18
7.Replace the cylinder head.
8.Replace and torque the cylinder head nuts to
68.0Nm (50.0lbf ft).
9.Turn the piston twice past TDC.
10.Remove the cylinder head and measure the
thickness of the lead, this should be:
TS - 0.813-0.889mm (0.032-0.035in).
TR - 0.889-0.965mm (0.035-0.038in).
If this measurement is not correct it can be
adjusted by adding or removing 0.07mm or
0.25mm (0.003 or 0.010in) thick shims placed
between the cylinder head and the gasket.
11.Replace the cylinder head.
12.Re-check the head clearance.
TX Engines
The cylinder head clearance is maintained by
0.07mm, 0.13mm or 0.38mm (0.003in, 0.005in,
0.015in) metal shims placed between the cylinder
barrel and crankcase.
1.From two 50mm x 1.6mm (2.00 x 0.063in) diameter
pieces of lead wire or soft, but not multicore,
solder form two 'U' shaped symmetrical loops.
2.Twist the open tails of each loop to form four or
five coils.
3.Refer to 'Figure 2.12.1' and using a very small
amount of grease place the two pieces of wire on
the piston crown.
The wires must be at each side of the gudgeon pin
axis and 90° to the centre line and just touching
the cylinder bore.
Care must be taken to ensure the wires are not
placed over any markings on the piston crown.
4.Replace the cylinder head.
5.Replace and torque the cylinder head bolts to
61.0Nm (45.0lbf ft).
6.Turn the piston twice past T.D.C.
7.Remove the cylinder head and measure the
thickness of the lead, this should be:
0.81-0.95mm (0.032-0.037in).
8.If it is necessary to change the shims:
a.Remove the cylinder barrel.
b.Place the necessary shims, dry, onto the
crankcase end of the cylinder barrel.
9.Replace the cylinder barrel and head.
2.13 THE VALVE ROCKER STUB
SHAFTS - TS/TR
The removal of the stub shafts is necessary when it
is required to examine or change the valves, valve
seats, rocker arms or rocker arm bushes.
Removing Stub Shafts
WARNING
Care must be taken to ensure that any part of the
hand is not likely to become trapped between the
two parts of the tool while it is being used.
1.Screw the small end of the adapter (A) into the
screw thread of the stub shaft and tighten.
Figure 2.13.1 Stub Shaft Tool
2.Preferably place the cylinder head into a vice, and
screw the slide hammer tool onto the adapter.
3.Grip the slide hammer in one hand and strike
the sleeve in the required direction until the stub
shaft has been removed.
4.Lift out the rocker arm.
Refitting the Stub Shaft
Before fitting check the oil holes are clear, fit a new
'O' ring to the recess on the inside face of the stub
shaft and coat the sealing groove nearest to the
bolt hole with Wellseal or Hylomar PL32/M.
When refitting, the mark 'TOP' on the outside face
of the stub shaft must be positioned towards the
top of the cylinder head.
WARNING
Care must be taken to ensure that any part of the
hand is not likely to become trapped between the
two parts of the tool while it is being used.
CAUTION
When refitting the stub shafts using the slide
hammer, great care must be taken not to
dislodge the 'O' ring on the inside face recess
of the shaft.
1.Fit the small end of the adapter (A) into the screw
thread of the stub shaft and tighten.
Ensure 'TOP' is correctly positioned.
2.Place the cylinder on its side on a bench and
place the rocker arm into position for refitting the
stub shaft.
Figure 2.13.1 Stub Shaft Tool
2. Preferably place the cylinder head into a vice, and screw the
slide hammer tool onto the adapter.
3. Grip the slide hammer in one hand and strike the sleeve in the
required direction until the stub shaft has been removed.
4. Lift out the rocker arm.
Refitting the Stub Shaft
Before fitting check the oil holes are clear, fit a new 'O' ring
to the recess on the inside face of the stub shaft and coat the
sealing groove nearest to the bolt hole with Wellseal or Hylomar
PL32/M.
When refitting, the mark 'TOP' on the outside face of the stub
shaft must be positioned towards the top of the cylinder
head.
WARNING
Care must be taken to ensure that any part of the hand
is not likely to become trapped between the two parts of
the tool while it is being used.
CAPTION
When refitting the stub shafts using the slide hammer,
great care must be taken not to dislodge the 'O' ring on
the inside face recess of the shaft.
1. Fit the small end of the adapter (A) into the screw thread of
the stub shaft and tighten.
Ensure 'TOP' is correctly positioned.
2. Place the cylinder on its side on a bench and place the rocker
arm into position for refitting the stub shaft.
3. Fit the slide hammer tool on to adaptor.
4. Align the stub shaft with the stub shaft hole.
5. Grasp the slide hammer with one hand while positioning the
rocker arm with the other and refit the stub shaft by striking
the end of the tool nearest the cylinder head with the slide
hammer.
If the rocker lever bush is not correctly lined up and is
preventing the stub shaft being refitted gently strike either
end of the tool with the slide hammer while repositioning
the rocker arm.
Note:
Ideally, after fitting, the stub shaft hole and internal hole of the rocker arm bush will
be perfectly aligned. Small 'G' clamps or a second pair of hands may be required.
2.14 The Valve Rockers - TX
The removal of the valve rocker assembly is necessary when it
is required to examine or change the valves, valve seats, rocker
arms or rocker arm bushes.
Removing an Individual Rocker Arm
Individual rocker arms can be removed without removing the
rocker assembly.
1. Remove the rocker cover.
2. With the piston at TDC on the firing stroke screw the rocker
adjusting screw (A) anti-clockwise until the valve spring is
not tensioned.
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