Truck Model

[hoffz31]

I have a '55 C3-PW6-I26 and was determining if the engine needs to be bored. The service manual mentions the following models for out-of-round and tapering. I was wondering what model my PW is closest to.

Max allowable out-of round is 0.005 inch for all models except B-4-R, B-4-T, B-4-V, and B-4-Y and .003 inch for B-4-R, B-4-T, B-4-V, and B-4-Y.

Is my PW the exception to the above statement?

Thanks everybody!

[Gordon Maney]

I suspect you are reading those in a full-line Dodge truck service manual and those are larger trucks with different engines. If a machine shop is involved in the evaluation of your block they will know good guidelines to use.

Your .005 figure is fine, as far as that goes, as a wear limit. Having said that, it is cylinder taper that will be the key, determining factor in cylinder wear evaluation. I think you will find the manual's spec on taper is a huge figure in comparison to current thinking.

[hoffz31]

Thanks Gordon,

Maximum taper is 0.15" for all truck models except B-4-R, B4-T, B-4-V, and B-4-Y and 0.10" for B-4-R, B4-T, B-4-V, and B-4-Y.

I thought both numbers seemed a little high. Two of the cylinders that I am concerned with had broken rings.

Max Eggshaping was at the top at 0.009

Max Tapering was 0.0035

[Gordon Maney]

Thanks Gordon,

Maximum taper is 0.15" for all truck models except B-4-R, B4-T, B-4-V, and B-4-Y and 0.10" for B-4-R, B4-T, B-4-V, and B-4-Y.

I thought both numbers seemed a little high. Two of the cylinders that I am concerned with had broken rings.

Max Eggshaping was at the top at 0.009

Max Tapering was 0.0035

I am thinking you mean .015 taper, correct?

Your out of round figure is the defining value. A taper of .0035 is not that bad.

[hoffz31]

Yes Gordon, you are correct. Max taper is 0.015. How bad do you think the out of round is? Would a new set of rings be ok, or would I get blow by. The two cylinders in question, had evidence of blow by on the pistons but each cylinder had a broken ring.

[Gordon Maney]

You say eggshape, I say out of round. The figure of .009 out of round is too much.

[hoffz31]

Thanks Gordon, you have been a huge help. It looks like I will be shopping for an engine hoist.