Isuzu Amigo / Axiom / Trooper / Rodeo / VehiCross. Manual - part 1215

6A–57

ENGINE MECHANICAL (Y22SE 2.2L)

Piston Pin

NOTE: Do not reuse the old piston pin.

1. Use a micrometer to measure the new piston pin

outside diameter in both directions at three different
positions.

Standard diameter: 21 mm (0.8268 in)

2. Install the new piston pin.

Coat connecting rod boss and upper part of
connecting rod stem with thermo-color pencil. When
the required assembly temperature is attained, green
color turns black. The colored line (arrow) must not
change colors over the entire length, but only up to the
start of the connecting rod stem. Heart upper
connecting rod boss of new connecting.

Assembly temperature: 280 to maximum 320

°

C

(536 to maximum 608

°

F).

015R100029

Connecting Rod Bearings Clearance

1. Measure the oil clearance between the connecting

rod and the crankshaft.
1. Remove the connecting rod cap bolts and the rod

caps.
Arrange the removed rod caps in the cylinder
number order.

2. Clean the rod bearings and the crankshaft pins.

3. Carefully check the rod bearings. If even one

bearing is found to be damaged or badly worn, the
entire bearing assembly must be replaced as a
set. Reinstall the bearings in their original
positions. Apply plastigage to the crank pin.

4. Reinstall the rod caps to their original positions.

Tighten the rod cap bolts.

1st step: 35 N·m (26 lb ft)

2nd step: 45

°

NOTE: Do not allow the crankshaft to rotate.

5. Remove the rod caps.

6. Measure the width of the plastigage and

determine the oil clearance. If the oil clearance
exceeds the limit, replace the rod bearing as a
set.

Standard : 0.006 mm–0.031 mm

(0.0002 in–0.0012 in)

Limit : 0.12 mm (0.0047 in)

7. Clean the plastigage from the bearings and the

crankshaft pins.

6A–58

ENGINE MECHANICAL (Y22SE 2.2L)

Crankshaft grinding dimensions

mm  (in)

(continued)

Production and Service

Con–rod bearing journal dia.

Standard size

(no color code)

48.970 to 48.988 (1.9279–1.9287)

Undersize 0.25 (0.0098)

blue

48.720 to 48.738 (1.9181–1.9188)

Undersize 0.5 (0.0197)

white

48.470 to 48.488 (1.9083–1.9090)

Con–rod bearing journal width

Standard size

(no color code)

26.460 to 26.580 (1.0417–1.0465)

Undersize 0.25 (0.0098)

blue

26.210 to 26.330 (1.0319–1.0366)

Undersize 0.5 (0.0197)

white

25.960 to 26.080 (1.0220–1.0268)

Con–rod width

26.338 to 26.390 (1.0369–1.0390)

Reassembly

1. Install connecting rod
2. Install piston
3. Install piston pin, refer to “piston pin”.

NOTE: When  changing piston / connecting rod
combinations, do not change the piston / piston pin
combination and do not reuse the old piston pin.

4. Install piston ring with the piston ring expander.

D

New piston rings with “Top” uppermost — use
commercially available pliers.

D

Position ring gaps:

1 — Compression rings 180

°

to each other as

illustrated (A).
2 — Offset oil control rings (B) or (B) 25 to 50 mm (1
to 2 in). from gap of second compression ring.

015R100025

D

After installation, apply engine oil to the entire
circumference of the piston rings. Check to see that
all the rings rotate smoothly.

6A–59

ENGINE MECHANICAL (Y22SE 2.2L)

5. Install piston and connecting rod assembly.

D

Insert the bearings into the connecting rods and
caps. Apply new engine oil to the bearing faces and
bolts.

D

Tighten the connecting rod cap bolts in 2 steps:

1st step : 35 N·m (26 lb ft)

2nd step: 45

°

NOTE: Do not apply engine oil to the bearing back faces.

6. Install balance unit assembly, refer to “Balance Unit

Assembly” in this manual.

7. Install balance unit assembly, refer to “Balance Unit

Assembly” in this manual.

8. Oil strainer and O-ring.
9. Install oil pan support assembly, refer to “Reassembly

of Crankshaft” in this manual.

10. Install cylinder head gasket.

11. Install cylinder head assembly.

D

Refer to “Cylinder Head Assembly” in this manual.

6A–60

ENGINE MECHANICAL (Y22SE 2.2L)

Cylinder Block

Cylinder Block and Associated Parts

015R100024

Legend

(1) Cylinder Head Assembly
(2) Oil Pump Assembly
(3) Oil Pan
(4) Oil Pan Support
(5) Oil Strainer

(6) Balance Unit Assembly
(7) Piston and Connecting Rod Assembly
(8) Main Bearing Cap
(9) Crankshaft

(10) Cylinder Block

Disassembly

1. Remove cylinder head assembly.
2. Remove cylinder head gasket.
3. Remove oil pan assembly.
4. Remove oil pan support.
5. Remove oil strainer.
6. Remove oil pump assembly.

7. Remove balance unit assembly.
8. Remove piston and connecting rod assembly.
9. Remove flywheel.

10. Remove rear oil seal retainer assembly.

11. Remove main bearing cap.

12. Remove crankshaft.
13. Cylinder block.