4G1 ENGINE (E-W) -
Crankshaft and Cylinder Block
11A-12-3
PWEE9520
E
Nov. 1995Mitsubishi Motors Corporation
REMOVAL SERVICE POINTS
A
A
"
OIL PRESSURE SWITCH REMOVAL
(1) Disconnect the oil pressure switch terminals.
(2) Using the special tool, remove t he oil pressure switch.
Caution
The thread is coated with sealant. Take care not to
bend it when removing the oil pressure switch.
INSPECTION
1. CRANKSHAFT OIL CLEARANCE
The crankshaft oil clearance can be measured easily
using a plastic gauge.
To check the crankshaft oil clearance with a plastic gauge,
carry ou t th e following procedure:
(1) Wipe all oil off th e crankshaft journal a nd th e bearing’s
inside surface.
(2) Install the crankshaft.
(3) Cut the plastic gauge such that its length matches the
width of the bearing, then place it on the journal along
the journal’s axis.
(4) Gently fit the crankshaft bearing cap a n d tighten the bolts
to the specified torque.
(5) Remove the bolts an d gently remove the crankshaft
bearing cap.
(6) Using the scale printed on the plastic gauge bag, measure
the plastic gauge’s crushed section at its widest point.
Standard value: 0.02 - 0.04 mm
Limit: 0.1 mm
NOTE
The crankshaft pins and journals are fillet-rolled a nd must
not be machined to undersize dimensions.
2. CYLINDER BLOCK
(1) Visually check for cracks, rust, and corrosion, and inspect
the cylinder block using a flaw detecting agent. Rectify
defects where possible or replace the cylinder block.
(2) Ensure that the top surface is free of gasket chips and
other foreign material. Check th e cylinder block’s top
surface for distortion using a straight edge and thickness
gauge.
Standard value: 0.05 mm
Limit: 0.1 mm
(3) Check the cylinder walls for cracks and seizure marks.
If defects are evident, bore all the cylinders to oversize
or replace t he cylinder block.
PWEE9520-A
E
Dec. 1998Mitsubishi Motors Corporation Revised
MD998054
Plastic
gauge
6EN0550
1EN0271
Fillet-rolled section
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