Mitsubishi 4g63, Руководство по обслуживанию

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CRANKSHAFT AND CYLINDER BLOCK
ENGINE OVERHAUL <4G63-Turbo> 11D-66
INSPECTION
M1113008800645
CRANKSHAFT OIL CLEARANCE
(PLASTIC GAUGE METHOD)
This plastic gauge method is recommended as a
simplest way of measuring the crankshaft oil clear-
ance.
Measure the crankshaft oil clearance using a plastic
gauge as follows:
1. Wipe off oil from the crankshaft journal surface
and the crankshaft bearing inner surface.
2. Install the crankshaft.
3. Cut a piece of plastic gauge whose length is
equivalent to the width of the bearing and place it
on the crankshaft journal in parallel with its axis.
4. Install the crankshaft bearing cap carefully and
tighten the bolts to the specified torque of 25
±
2
N
⋅
m + 90
°
to 100
°
.
5. Remove the bolts, then remove the crankshaft
bearing cap carefully.
6. Measure the largest width of the crushed plastic
gauge using the ruler printed on the bag of the
plastic gauge.
Standard value: 0.02 − 0.04 mm
Limit: 0.1 mm
CYLINDER BLOCK
1. Visually check the cylinder block for scratches,
rust, and any other corrosion. Also check it for
cracks using a flaw detecting penetrant.
If any defect is evident, replace the cylinder block.
2. Use a straightedge and thickness gauge to check
the cylinder block top surface for warp.
Make sure that the surface is free from remaining
gasket material and other foreign matter.
Standard value: 0.05 mm
Limit: 0.1 mm
3. If the distortion is excessive, correct within the
allowable limit or replace.
Grinding limit: 0.2 mm
*Includes/combined with cylinder head
grinding
Cylinder block height (when new): 284 mm
4. Check cylinder walls for scratches and seizure.
If defects are evident, rebore to oversize or
replace the cylinder block.
5. Use a cylinder gauge to measure the cylinder
bore diameter and taper.
If the cylinder is worn badly, rebore it to an
oversize and replace the piston and piston rings
with ones matched with the new bore size.
Standard value: 85.0 mm
Taper: 0.01 mm
AK300203
Plastic gauging material
AD
AK300204
Plastic gauging material
AD
AK300205
A
B
C D E
F
G
AK300206
12mm
AD
A
B
Center
Bottom