Cat 30 specs

Also, for our PS1 up Thirty, can one of the members give me the torque for the rod bolts / nuts, and the torque for the head nuts, and valve clearances? Thank you all.

If there is nothing in the Library for a Thirty - check on a big Twenty or similar machine. I would not torque them over specs for Grade 5 bolt at the maximum. Metallurgy has changed a great deal in the last 100 years. I do not recall ever using a torque wrench on the PS Thirty's I worked on as a teenager but that is long ago now. Many of the mechanics used FEEL and it worked very well in those era's. -- cts

there were no specs for those times, a normal box end wrench of the day with a good heave usually did the job and recheck after warm up and cool down--recheck again after 8 hours. Wrenches are usually sized to suit the torque needed with a good heave.

However with the advent of tension wrenches then as people requested torque settings as engines etc. became more sophisticated settings were developed.

The scans below are from my 1966 era torque wrench instruction book for when you do not know the tensile strength of the fastener.

Well that did not work--again!!!!!

A Caterpillar torque chart from way back.

At a Cat school we were told that upper and lower range of a given torque value was to allow for variations in each torque wrench accuracy so you choose the middle point and hope you got somewhere near within the given range!!!

Edb, those are great! I’ve been looking for this kind of chart for a while. Thanks

CatAddict01-- as you are most probably aware - not all bolts are made equally. I would be cautious of over-tightening old bolts as you will find on a PS - Thirty. I do not have valve clearance data, but would start with about 0.015 hot (operating temperature) They will accept larger clearances much better than too tight, As a rule, I was always told to start at the center of a head or other part, and work toward the ends evenly, working in increments. That was on manifolds too. ( Thirty head was tight with 1/2" drive breaker bar, then checked again after warm up. Not scientific calibrations but never had an issue, sometimes used old head gaskets again - painted them with aluminum paint, helps to seal them again. - cts