Specifications

4M41 ENGINE -

Piston and Connecting Rod

11B-23-3

PRE-REMOVAL INSPECTION

1. PISTON PROTRUSION FROM CRANKCASE TOP

Caution

Do not fail to check piston protrusions. The engine

performance are directly influenced by them.

(1) Position each piston at the TDC.

(2) There are five reference points A on the upper

crankcase

that serve as a zero level each. Check

piston protrusions with respect to these reference

points. (Piston protrusion = Measuring point B -

Reference point A)

(3) Measure piston protrusions at two points per cylinder

(8 in total) using the closest reference point, and

average the readings.

(4) If the average deviates from the specified standard

value, check clearances at necessary points.

Standard value: - 0.20 - - 0.30 mm

(5) Select the cylinder head gasket having a thickness

that corresponds with the average of piston

protrusions (measured at 8 points).

2. CONNECTING ROD END PLAY

(1) Measure end play of each connecting rod.

(2) If the measurement exceeds the specified service limit,

replace defective part.

Standard value: 0.15 - 0.45 mm

Limit: 0.6 mm

REMOVAL SERVICE POINTS

NUT REMOVAL

Caution

Provide one punch mark A on the head of the nut 1 each

time it is used to tighten the connecting rod bolt 14. If

it has three punch marks (the evidence of having been

tightened 3 times), replace both the nut 1 and the

connecting rod bolt 14.

PISTON RING REMOVAL

Using the special tool, remove each piston ring.

PWEE9409-D

Feb. 2000Mitsubishi Motors Corporation Added

MH060014