distortion and parallelism is .002" (.05 mm) or less.
2) Check piston pin diameter at several points. Check
interference fit between pin and small end of connecting rod. Check
fit between piston pin and piston by applying a thin coat of oil to
pin and checking that pin fits into piston with finger pressure. If
pin cannot be fitted, select a pin of smaller diameter.
Installation
Inspect oil jet on connecting rod for obstructions and clean
as necessary. Assemble connecting rod so that front mark on piston
and "ISUZU" stamp on connecting rod are on same side. Lightly oil pin
bores in piston and rod. Press pin into piston and rod.
CRANKSHAFT & ROD BEARINGS
CRANKSHAFT MAIN BEARINGS
1) Use Plastigage method to check main bearing clearances.
If clearances are exceeded, install undersize bearings. Replacement
bearings are available in standard, .010" (.25 mm) undersize and
.020" (.50 mm) undersize.
2) Remove crankshaft from engine. Measure crankshaft
journals and crankpins to check for wear and taper. If taper exceeds
.002" (.05 mm), replace or correct crankshaft.
3) Check crankshaft runout by placing "V" blocks under
crankshaft at No. 1 and No. 5 journals. Position dial indicator point
on No. 3 journal. Slowly turn crankshaft, while noting runout. If
runout exceeds .004" (.10 mm), replace or correct crankshaft.
Standard runout is .001" (.03 mm) or less.
4) Lubricate engine bearings. Install main bearing caps with
arrow pointing toward front of engine. Tighten caps gradually and in
sequence of caps No. 3, No. 4, No. 2, No. 5 and No. 1. Tighten caps
to specification. Ensure that crankshaft turns freely.
CONNECTING ROD BEARINGS
Mark connecting rod and cap on starter side of engine for
cylinder identification. Remove rod cap. Check bearing clearance
using Plastigage. If clearance exceeds specifications, install new
bearing. Replacement bearings are available in standard, .010" (.25
mm) undersize and .020" (.50 mm) undersize.
THRUST BEARING ALIGNMENT
Install bearings in engine block. Position crankshaft in
place. Install thrust bearing on both sides of No. 3 crankshaft
journal. Move crankshaft fully forward and measure clearance between
crankshaft and thrust bearing. If clearance is greater than .012"
(.30 mm), replace thrust bearing.
REAR MAIN BEARING OIL SEAL
Removal
Remove starter. Remove transmission. Remove clutch assembly
(if equipped). Remove flex plate or flywheel. Pry oil seal from seal
retainer.
Installation
Position seal in retainer. Fill clearance between lips of
seal with grease. Coat seal lips with engine oil. Using Seal
Installer (J-22928-A), install seal into retainer. Reverse removal
procedure to complete installation.
