Service manual

G420F(FE) Service Manual Chapter 3. Engine Mechanical System 91
Disassembly
1. Remove the timing belt train, front case, flywheel,
cylinder head assembly, and oil pan.
2. Remove the rear oil seal.
3. Disconnect the connecting rod cap.
4. Remove the main bearing cap. (Arrange it in
order)
5. Remove the crankshaft.
6. Disassemble the crankshaft position sensor wheel.
NOTE: Put an identification mark on the main
bearing cap to refer to the original position and
direction.
Inspection
1. Crankshaft
1) Check the oil hoe for clogging as well as
crankshaft journal pin for damage, uneven wear
and crack. Repair or replace parts if necessary.
2) Inspect out of circularity of the crankshaft
journal taper and pin.
Crankshaft journal O.D 57mm
Crank pin O.D 45mm
Out of circularity of crankshaft
journal pin
0.01mm or less
2. Main bearing and connecting rod bearing
Visually inspect each bearing for scratch, melting,
sticking, and fault contact and replace the bearing
if necessary.
3. Measuring oil clearance
1) Measure O.D of the crankshaft journal and pin.
2) Measure diameter of the crankshaft bore and
connecting rod bore.
3) Measure the thickness of the crankshaft and
connecting rod bearing.
4) Calculate clearance by subtracting O.D of the
journal pin and thickness of the bearing from
diameter of the bore.
Journal oil clearance 0.028 ~ 0.048mm
Pin oil clearance 0.024 ~ 0.044mm
Main bearing cap bolt
2.7 ~ 3.3kg·m+
(60°~ 65°)
Connecting rod cap bolt 5.0 ~ 5.3kg·m
4. Oil seal
Check the front and rear oil seal and replace it
with new parts if necessary.