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4G1 ENGINE (E-W) -
Crankshaft and Cylinder Block
11A-12-4
PWEE9520
E
Nov. 1995Mitsubishi Motors Corporation
(4) Using a cylinder gauge, measure each cylinder’s bore
and cylindricity. If any cylinder is severely worn, bore
all th e cylinders to oversize an d replace the piston and
piston rings accordingly. Take measurements at t h e points
shown.
Standard value:
Cylinder bore:
4G13 engine: 71.0 mm
4G15 engine: 75.5 mm
4G18 engine: 76.0 mm
Cylindricity: 0.01 mm or less
3. BORING CYLINDERS
(1) Oversize pistons to be used should be determined on
the basis of t he cylinder with the largest bore.
(2) Oversize pistons are available with the following oversize
dimensions: 0.25 mm, 0.50 mm, and 1.00 mm. Measure
the diameter of the piston to be used. Boring must be
carried out such that the piston-to-cylinder clearance
complies with the standard value. The piston’s diameter
should be measured at the points shown.
(3) Calculate the boring finish dimension based on the piston
diameter dimension.
D
[Boring finish dimension] = [piston O.D.] +
[piston-to-cylinder clearance (0.02 – 0.04 mm)] -
[honing margin (0.02 mm)]
(4) Bore each cylinder to the calculated boring finish
dimension.
Caution
To prevent distortion caused by heat increases during
boring bore the cylinders in the following order: No.
2, No. 4, No. 1, No. 3.
(5) Hone the cylinders to the final finish dimension (piston
O. D. + piston-to-cylinder clearance).
(6) Check the clearance between the pistons and cylinders.
Standard value: 0.02 - 0.04 mm
INSTALLATION SERVICE POINTS
"
A
A
OIL PRESSURE SWITCH INSTALLATION
(1) Apply the specified sealant to the thread, then fit the
oil pressure switch using t he special tool shown in the
illustration.
Specified sealant:
3M ATD Part No. 8660 or equivalent
Caution
1. Apply sealant such that none is squeezed out
past end of the thread.
2. Do not over-tighten the oil pressure switch.
PWEE9520-A
E
Dec. 1998Mitsubishi Motors Corporation Revised
12
mm
6EN0553
Piston O. D.
Thrust
direction
6EN0554
Apply sealant
MD9988054