New to this site and looking for information on my Komatsu engine rebuild. The dozer is a 1997 D31P-16 with a 4D105-3 engine. I need to know if the headbolts are torque to yield (one time use only) or if I can reuse the old ones. The shop manual doesn't address this issue. Thanks
If not discussed in manual, my gut feeling is reuseable. Lay thread across each other and look for strech.
All the Komatsu engines I have worked on were torque/turn. There was always a measurement in a service manual that would indicate re-use or replace. The engines of that time period that I worked on were 4D95 engines which were actual Komatsu engines. Yours sounds like the Cummins clone. Perhaps you can check with a Cummins dealer to check that and use their service manual. The Cummins gasket kits had a tool that measured go/no go on the bolts.
John c x2 Even the komatsu gasket kits come with one iirc