Piston And Connecting Rod Reassembly - Isuzu NHR 4J Series Workshop Manual

5) Tighten the cap nuts in 2 steps, using angular
4JG2
4JA1, 4JB1, 4JB1TC
NOTE:
Do not allow the crankshaft to rotate.
6) Remove the rod caps.
7) Measure the width of the plastigage and determine
8) Clean the plastigage from the bearings and the
Crankshaft Journal and Bearing Clearance
4JB1 /
6A-53-1.tif
4JB1T /
4JB1TC
4JG2
REASSEMBLY
11. Connecting Rod
10. Piston
9. Piston Pin
Apply a cost of engine oil to the piston pin and the piston
pin hole.
8. Piston Pin Snap Ring
Apply a thin coat of engine oil to the piston pin.
Try to insert the piston pin into the piston pin hole with
normal finger pressure.
Weigh each piston and connecting rod assembly.
Select piston and connecting rod combinations so that the
weight variation of the different assemblies a held within
the specified limits.
NOTE:
When changing piston/connecting rod combinations,
do not change the piston/piston pin combination
GENERAL ENGINE MECHANICAL 6A – 53
tightening method as shown in the following
specifications. (4JG2)
1st Steps
29 (3.0/22)
83 (8.5/61)
the oil clearance. If the oil clearance exceeds the
limit, replace the rod bearings as a set.
crankshaft pins.
Standard
0.029 - 0.066
(0.0011 - 0.0026)
0.029 - 0.083
(0.0011 - 0.0033)
Variance in weight
after assembly
N∙m (kg∙m/lb∙ft)
2nd Step
45° - 75°
N∙m (kg∙m/lb∙ft)
mm (in)
Limit
0.100 (0.0039)
g (oz)
Less than 3
(0.1058)