Land Rover engine 300 TDi. Manual — part 8
ENGINE
12
OVERHAUL
10. Withdraw push rods.
11. Remove valve caps.
CAUTION: Keep push rods and valve caps
in their fitted order.
Rocker shaft - dismantling
1. Suitably identify each component to its fitted
position.
2. Remove locknut and tappet adjusting screw
from each rocker.
3. Remove slave bolt and pedestal from end of
rocker shaft.
4. Remove washer, rocker arm and spacer
followed by second rocker arm, spacer and
pedestal.
5. Repeat above procedures until all components
are removed.
ENGINE
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13
Inspecting components
1. Measure and record diameter of rocker shaft at
one of the pedestal locations.
2. Measure and record diameter of rocker shaft at
each of the rocker arm locations.
3. Compare measurements obtained and
calculate difference between diameters. If wear
at any rocker shaft location exceeds 0.025 mm,
a new rocker shaft must be fitted.
4. Check rocker arm pads for signs of wear,
replace rocker arms as necessary.
5. Check threads and ball ends of each tappet
adjusting screw for wear. Pay particular
attention to ball ends, replace any showing
signs of flattening on the ball or damage to
threads.
6. Check that each nut runs freely on adjusting
screw threads.
7. Check each push rod for signs of wear and for
straightness, replace as necessary.
8. Check valve caps for signs of wear, replace as
necessary.
9. Check rocker arm bushes for scoring and
wear.
10. Assemble each rocker arm to its fitted location
on rocker shaft and check clearance of bush to
shaft does not exceed 0.12 mm.
11. If clearance exceeds figure given, bushes must
be replaced.
Rocker arm bushes - replace
1. Support rocker arm on bed of hand press.
2. Using a suitable piloted mandrel, press bush
out of rocker arm.
3. Lubricate replacement bush with engine oil and
press into rocker arm ensuring that lubrication
holes in bush and arm are aligned.
4. Check that lubrication holes in each rocker arm
are clear.
5. Check that lubrication holes in rocker shaft are
clear.
6. Check spacers and washers for wear, replace
as necessary.
ENGINE
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Rocker shaft - assembling
1. Lubricate all components with engine oil.
2. Assemble rocker arms, spacers, washers and
pedestals to rocker shaft ensuring that they are
in their original fitted positions.
3. Retain pedestals 1 and 5 with slave bolts.
Rocker shaft - refit
1. Lubricate push rods with engine oil and fit to
their original positions. Ensure that ball end of
each push rod is correctly located in each cam
follower slide.
2. Screw each tappet adjusting screw into its
respective rocker arm until ball end is flush with
underside of arm; fit but do not tighten
locknuts.
3. Lubricate valve pads with engine oil and fit to
their original positions.
4. Position rocker shaft to cylinder head, fit but do
not tighten 3 nuts.
5. Remove slave bolts from pedestals 1 and 5, fit
but do not tighten 2 bolts.
6. Locate each push rod in turn beneath its
respective tappet adjusting screw and tighten
each screw until ball end locates in recess in
push rod.
7. Working from the centre outwards,
progressively tighten 3 nuts and 2 bolts to 5
Nm.
ENGINE
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15
8. Make a suitable pointer from welding rod and
position it to number 1 pedestal stud.
9. Temporarily fit a nut to secure pointer to stud.
10. Assemble degree plate LRT-12-007 to a
suitable torque wrench or extension bar.
11. Tighten the centre pedestal nut a further 50
°
.
12. Tighten 2 pedestal bolts and number 5
pedestal nut a further 50
°
.
13. Remove pointer and secure it to number 5
pedestal stud.
14. Tighten number 1 pedestal nut a further 50
°
.
15. Remove pointer.
16. Adjust valve clearances.
17. Thoroughly clean mating faces of rocker cover
and cylinder head, remove all traces of gasket
material using gasket removal spray and a
plastic scraper.
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