Isuzu 4LE2 — Procedure for using the plastigauge (example: connecting rod bearing to crank pin clearance)
Adjustments · Connecting rod bearing / crank pin
For the Isuzu 4LE2, from the Isuzu service manual.
Applies to: Isuzu 4LE2, Isuzu 4LE2 engine
Before you start
- Do not move the connecting rod while using the plastigauge.
Procedure
- Clean the connecting rod and bearing, and install the bearing to the rod.
- Cut the plastigauge to the same width as the crank pin, and lay the gauge parallel to the pin avoiding the oil hole.
- Line up the marks on the connecting rod and cap and install the crank pin.
- Apply molybdenum disulfide to the thread section and seating surface of the tightening bolt, and rotate both cap and bolt to the correct torque.
- Gently remove the cap and connecting rod, and measure the crushed width of the plastigauge using the scale printed on the bag.
Tools required
- Plastigauge Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- PG-1 (Green) measurable range 0.025 - 0.076 mm {0.001 - 0.003 in}
- PR-1 (Red) measurable range 0.051 - 0.152 mm {0.002 - 0.006 in}
- PB-1 (Blue) measurable range 0.102 - 0.229 mm {0.004 - 0.009 in}
Full service-parts list: Isuzu 4LE2 →, Isuzu 4LE2 engine →
Source: Isuzu service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.