F9Q ENGINE – Piston
11A-13-3
(4) Tighten the new connecting rod bearing cap bolts to a
torque of 50 Nm.
INSPECTION
PISTON
(1) Measure the piston diameter at a point where A = 39
mm
Standard value: 80 mm
PISTON RING
(1) Measure the thickness of the piston rings to check for
wear.
Standard value
Piston ring No. 1: 2.5 mm
Piston ring No. 2: 2.0 mm
Oil ring: 3.0 mm
PISTON PROTRUSION
(1) Clean the piston crown to remove deposits.
(2) Turn the crankshaft in the direction of operation to bring
piston No. 1 to TDC.
(3) Measure the protrusion of No. 1 piston using a dial gauge.
NOTE
Do not take measurement at valve recess.
(4) Measure the piston protrusion on the remaining cylinders
by following the same procedure.
PWEE0001-A
E
Mar. 2001Mitsubishi Motors Corporation Revised
REN0114
50 Nm
REN0199
A
REN0200
DEN0798
Protrusion
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