Land Rover engine 300 TDi. Manual — part 20
ENGINE
60
OVERHAUL
Main bearing clearance - checking
CAUTION: If crankshaft has been
reground, oversize main bearing shells
must be fitted.
1. Degrease new main bearing shells and ensure
all traces of oil are removed from crankshaft
journals.
2. Fit new main bearing shells to saddles and
main bearing caps ensuring that tags are
located in recesses in saddles and bearing
caps.
NOTE: Number 5 main bearing shells are
wider than numbers 1 to 4.
3. Using assistance, fit crankshaft.
4. Place a piece of Plastigage across width of
each main journal.
5. Fit main bearing caps to their correct location
ensuring that direction marks are facing the
correct way; fit each pair of main bearing cap
bolts and tighten to 133 Nm.
CAUTION: Do not rotate crankshaft.
6. Remove main bearing caps and bearing shells.
CAUTION: Retain main bearing shells and
cap bolts with their respective main
bearing caps.
7. Measure widest portion of Plastigage on each
main bearing journal using the scale supplied;
the graduation that corresponds to the widest
portion of Plastigage indicates main bearing
clearance.
Main bearing clearance = 0.031 to 0.079 mm
8. If main bearing clearances are incorrect, use a
combination of standard and oversize main
bearing shells and re-check clearances.
CAUTION: Keep main bearing shells
selected in their fitted order.
9. Remove all traces of Plastigage using an oily
rag.
10. Using assistance, remove crankshaft.
11. Remove upper main bearing shells and keep in
their fitted order.
ENGINE
OVERHAUL
61
Crankshaft end-float - checking
1. Lubricate upper main bearing shells and
crankshaft main bearing journals with engine
oil.
2. Lubricate new standard size thrust washers
with engine oil and position washers in recess
in centre main bearing saddle.
NOTE: Grooved side of washers must face
outwards.
3. Using assistance, fit crankshaft.
4. Attach a DTI to rear face of cylinder block with
stylus contacting end of crankshaft; push
crankshaft fully rearwards and zero gauge.
5. Push crankshaft fully forwards and measure
end-float.
6. If end-float exceeds 0.05 to 0.15 mm, remove
crankshaft, fit combinations of standard and
oversize thrust washers to achieve correct
end-float.
CAUTION: Variations of thrust washer
thicknesses on each side of crankshaft
must not exceed 0.08 mm.
7. When end-float is correct, remove DTI.
8. Using assistance, remove crankshaft and
thrust washers. Ensure that thrust washers are
identified to their location.
ENGINE
62
OVERHAUL
Big-end bearing clearance - checking
1. Fit pistons and connecting rods.
2. Degrease new big-end bearing shells.
3. Fit big-end bearing shells to connecting rods
ensuring that tag is located in recess in
connecting rod.
4. Fit big-end bearing shells to bearing caps
ensuring that tag is located in recess in cap.
5. Temporarily fit crankshaft pulley bolt and rotate
crankshaft to bring numbers 1 and 4 journals to
BDC.
6. Remove all traces of oil from crankshaft
journals.
7. Pull numbers 1 and 4 connecting rods on to
crankshaft journals, remove plastic tubing from
connecting rod bolts.
8. Place a strip of Plastigage across width of
numbers 1 and 4 big-end journals.
9. Fit bearing caps and shells to connecting rods
ensuring that reference marks on caps and
rods are aligned.
10. Fit big-end bearing cap nuts and tighten to 59
Nm.
CAUTION: Do not rotate crankshaft.
11. Remove big-end bearing caps and shells.
12. Measure widest portion of Plastigage on
crankshaft journals using the scale supplied;
the graduation that corresponds to the widest
portion of Plastigage indicates big-end bearing
clearance.
Big-end bearing clearance = 0.025 to 0.075
mm
13. If big-end bearing clearances are incorrect, use
a combination of standard and oversize
bearing shells and re-check clearance.
CAUTION: Retain selected shells with their
respective connecting rods and caps.
14. Remove all traces of Plastigage using an oily
rag.
15. Repeat above procedures for numbers 2 and 3
big-end bearings.
ENGINE
OVERHAUL
63
Crankshaft, main and big-end bearings - refit
Crankshaft and main bearings
CAUTION: Cylinder bores must be
inspected before crankshaft is refitted -
See cylinder block - inspection
1. Lubricate selected main bearing shells, thrust
washers and crankshaft journals with engine
oil, ensure bolt holes in bearing saddles are
clean and dry; fit bearing shells in main bearing
caps and saddles.
2. Fit seal guides LRT-12-035 to cylinder block
ensuring that edges of guides are parallel to
edge of main bearing cap recess.
3. Using a sharp blade, cut a 0.40 to 0.80 mm
wide chamfer on edge of new seals.
4. Lubricate oil seals with engine oil and fit to
number 5 main bearing cap.
5. Fit selected thrust washers to centre main
bearing saddle.
NOTE: Grooved side of thrust washers
must face outwards.
6. Using assistance, fit crankshaft.
7. Fit main bearing caps and bolts ensuring that
they are in their fitted order and direction marks
are facing the correct way. Lightly lubricate
main bearing cap bolts, fit and finger tighten
bolts.
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