1756cc Torque Specifications

[Nut124]

Nut124

Big thanks for that information. I will be using a set of new conn rod bolts from Auto-Ricambi.
When you removed the over-torqued bolts, did you observe any bearing damage?

No, no damage. I do not think there is anyway any over torque could cause bearing damage. The bearings do not get any tighter no matter how much you torque the cap bolts, unless the bearings are too thick for the job and there is a gap between the two sides of the rod or main journal. If that were the case, the engine would fail anyway.

[3505jd]

Based on your information, I will proceed with my engine rebuild with confidence. Can't thank you enough!

[Nut124]

Based on your information, I will proceed with my engine rebuild with confidence. Can't thank you enough!

I'm glad I could be of some assistance. I have gotten plenty of help from an engine bulders' forum. The key advice was; when in doubt, stop and re-assess, consult experts, sleep on it.

When you torque the main caps, keep feeling how the crank turns. Did you check clearance w plastigauge?

Once the pistons and rods are in, try to assess the short block turning torque. There are some specs for this and I have the numbers from my build.

[3505jd]

My short block was re-built by a reputable engine builder. Unfortunately, they used the torque specs I provided which proved to be incorrect, so I will only have to replace the rod bolts.

[3505jd]

I would appreciate the turning specs all the same. Do you have a procedure for that checking the turning torque?

[Nut124]

Guy Croft book states that a 2l short block with oiled bores should turn over with 12 ft lbs or less with a torque wrench. The torque is not even, highest when pistons are half way up, down the bore. This should be 12 or under.

[3505jd]

Are the torque specs wet or dry? I cannot find any reference in any of the three manuals I have.

[3505jd]

Nut124

Is your engine still holding together with 39 lb-ft rod nut torque?

[Nut124]

Nut124

Is your engine still holding together with 39 lb-ft rod nut torque?

Yes. Do not torque the skinnier bolt nuts to over 40 lbs.

[3505jd]

Thanks Nut124