Checking Main Bearing Clearance for 300Tdi Engine Overhaul
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.