Isuzu 4LE2 — How to tighten by the angle method
Adjustments · Bolts tightened by angle method
For the Isuzu 4LE2, from the Isuzu service manual.
Applies to: Isuzu 4LE2, Isuzu 4LE2 engine
Before you start
- Follow the instructed order to tighten bolts.
- Do not retighten if you tighten by the angle method.
- Check the mark to confirm you tightened the bolt to the specified angle; otherwise you may re-tighten by angle method and damage the bolt.
Procedure
- Apply molybdenum disulfide or engine oil to the threads and the seating surface of the bolt following the instruction.
- Tighten all bolts to the pre-indicated tightening torque.
- Draw lines on the surface of the parts you tighten: lines through the bolt's center (A-B bolt side, C-D parts side) and the line at the specified tightening angle from the bolt's center (E-F).
- Tighten the bolt with wrench until the line on the bolt (A-B) aligns with the specified angle line (E-F on the surface of the parts).
Tools required
- Bolt angle gauge (5-8840-0266-0) Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
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.