TS, TR, TX engines workshop manual
15
3. Remove the drive belt.
4. Remove the fan from the mounting bracket; it will be
necessary to slacken the fan cowling.
Refitting the Fan
CAPTION
The drive belt must not be levered or wound on and care
must be taken to ensure it is correctly fitted onto the
pulley grooves.
The above removal procedure is reversed when the fan is
replaced and after the drive belt has been fitted it must be
correctly tensioned.
2.8 Drive Belt Tension
It is important that the tension of the drive belt is checked after
the first 50 hours, after an overhaul, after a new belt has been
fitted and as specified in "Maintenance Schedule".
The measurements shown in the table are taken in the centre
of the longest span after the belt has been turned through 360º
to equalise the tension.
After adjustment turn the belt through 360º and recheck the
deflection.
Belt tension force
Deflection
N
lbf
mm
in
New belt
31.0-33.0
7.0-7.5
3.5
0.14
Used belt
22.0-24.0
5.0-5.4
T SERIES ENGINES WORKSHOP MANUAL
16
Removing the Fan
1.Remove the drive guards.
2.Slacken the alternator mounting bolts and move the
alternator as far as it will go towards the crankcase.
3.Remove the drive belt.
4.Remove the fan from the mounting bracket; it will
be necessary to slacken the fan cowling.
Refitting the Fan
CAUTION
The drive belt must not be levered or wound on
and care must be taken to ensure it is correctly
fitted onto the pulley grooves.
The above removal procedure is reversed when
the fan is replaced and after the drive belt has been
fitted it must be correctly tensioned.
2.08 DRIVE BELT TENSION
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checked after the
first
50 hours, after an overhaul,
after a new belt has been
fitted
and as
specified
in
"Maintenance Schedule".
The measurements shown in the table are taken
in the centre of the longest span after the belt has
been turned through 360º to equalise the tension.
After adjustment turn the belt through 360º and re-
check the deflection.
Belt Tension Force
Deflection
N
lbf
mm
in
New Belt 31.0 - 33.0 7.0 - 7.5
3.5
0.14
Used Belt 22.0 - 24.0 5.0 - 5.4
Figure 2.8.1 Belt Tension
2.09 AXIAL FAN DRIVE GUARD - TX
A polypropylene replaces the earlier, welded steel
guards. If a later guard is being
fitted
in place
of a metal type the end cover must be
modified.
Drawing SK2204/91 is available from Lister Petter
Power Systems for this purpose.
2.10 THE CYLINDER HEAD COVER
The light alloy cylinder head cover, which is bolted
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breather box, decompressors, injector and valve
gear.
The TS/TR engine mounted fuel tank is secured to
the side of the cylinder head cover at the gear end
by three setscrews (two on early engines) and by
two setscrews in the side shield.
The Crankcase Breather
On the majority of TS and TR engines a plate locates
over the breather tube and forms an oil separator
box in the cylinder head cover which connects with
the inlet manifold port via a copper pipe brazed to
the plate. The breather plate has a metal contact
with the cylinder head cover and is secured with
three self tapping screws. A felt washer is
fitted
around the top of the tube between the cylinder
head and breather plate and care must be taken
to ensure the washer is
refitted
on re-assembly.
The breather tube forms an interference
fit
in the
cylinder head.
Removing the Cylinder Head Cover
1.Remove the lifting eye and fuel tank securing
bolts if necessary.
2.Remove the four bolts securing the cover.
3.Lift off the cover being careful not to damage the
joint or leak-off pipe.
Refitting the Cylinder Head Cover
1.On TS/TR engines ensure the breather plate
is securely retained in position and that the felt
washer is fitted round the breather tube.
2.Clean the cover and cylinder head joint area.
3.Place the joint on the cylinder head.
4.Move the decompressor lever, if
fitted,
into the
vertical position.
5.Replace the cylinder head cover ensuring the
decompressor lever, if
fitted,
is located between
the two stops and the fuel injector leak-off pipe is
located snugly in the recess provided.
6.Fit the four bolts with new washers.
2.11 THE CYLINDER HEAD
On and after the TX engine serial numbers shown,
two spring disc washers were
fitted
under each
cylinder bolt head instead of one plain washer.
38 00138 TX2
38 00206 TX3
Figure 2.8.1 Belt Tension
2.9 Axial Fan Drive Guard - TX
A polypropylene replaces the earlier, welded steel guards. If a
later guard is being fitted in place of a metal type the end cover
must be modified.
Drawing SK2204/91 is available from Lister Petter Power
Systems for this purpose.
2.10 The Cylinder Head Cover
The light alloy cylinder head cover, which is bolted to the
top of the cylinder head, gives access to the breather box,
decompressors, injector and valve gear.
The TS/TR engine mounted fuel tank is secured to the side of the
cylinder head cover at the gear end by three setscrews (two on
early engines) and by two setscrews in the side shield.
The Crankcase Breather
On the majority of TS and TR engines a plate locates over the
breather tube and forms an oil separator box in the cylinder
head cover which connects with the inlet manifold port via
a copper pipe brazed to the plate. The breather plate has a
metal contact with the cylinder head cover and is secured
with three self tapping screws. A felt washer is fitted around
the top of the tube between the cylinder head and breather
plate and care must be taken to ensure the washer is refitted
on re-assembly.
The breather tube forms an interference fit in the cylinder
head.
Removing the Cylinder Head Cover
1.Remove the lifting eye and fuel tank securing bolts if
necessary.
2. Remove the four bolts securing the cover.
3. Lift off the cover being careful not to damage the joint or
leak-off pipe.
Refitting the Cylinder Head Cover
1. On TS/TR engines ensure the breather plate is securely
retained in position and that the felt washer is fitted round
the breather tube.
2. Clean the cover and cylinder head joint area.
3. Place the joint on the cylinder head.
4. Move the decompressor lever, if fitted, into the vertical
position.
5. Replace the cylinder head cover ensuring the decompressor
lever, if fitted, is located between the two stops and the
fuel injector leak-off pipe is located snugly in the recess
provided.
6. Fit the four bolts with new washers.
2.11 The Cylinder Head
On and after the TX engine serial numbers shown, two spring
disc washers were fitted under each cylinder bolt head instead
of one plain washer.
38 00138 TX2
38 00206 TX3
Removal of a Cylinder Head
1. Remove the cylinder head cover.
2. Remove the valve rocker lubricating oil feed pipe by removing
the oil swivel plugs from the cylinder head and crankcase.
3. Remove the fuel pump to injector pipe.
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