Doosan — Tightening cylinder head bolts after a repair
Repair & overhaul
From a Doosan service manual covering: P158LE, P158LE-III, P180LE, P180LE-1, P180LE-II, P180LE-S, P222LE, P222LE-1, P222LE-S, PU158TI, PU180TI, PU222TI. Check it applies to your exact model before use.
Applies to: Doosan P158LE, Doosan P180LE, Doosan P180LE-II, Doosan P222LE, Doosan PU158TI, Doosan PU180TI, Doosan PU222TI, Doosan P158LE engine, Doosan P180LE-1 EASOB/QB engine, Doosan P222LE-1 EAYOB/QB engine, Doosan PU158TI EASOA/QA engine, Doosan PU180TI EASOA/QA engine
Before you start
- Do not use any oils or oil additives that contain MoS2.
Procedure
- Oil cylinder head bolt threads with engine oil (not the bore).
- Coat contact face of bolt head with Optimoly White T assembly paste.
- 1st pretightening step to 10 N.m.
- 2nd pretightening step to 80 N.m.
- 3rd pretightening step to 150 N.m.
- 4th pretightening step turn by 90°.
- Final tightening turn by 90°.
Tools required
- Torque wrench Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- 10 N.m
- 80 N.m
- 150 N.m
- 90°
- 90°
Full service-parts list: Doosan P158LE →, Doosan P180LE →, Doosan P222LE →
Source: Doosan 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.