Block cutting, specific to ISX/X

[dericson]

(09-28-2022 )Rawze Wrote:  

(09-28-2022 )dericson Wrote:  What’s happening folks.

Have an odd question that I think I’m overthinking. Typically cut counterbores on midrange blocks. Have a buddy looking to cut his x15 block. I’m not looking on advice on the hot topic about brass vs ss shims. But I was recently talking to a guy and he said he adds a ss shim to the bottom of a captive shim factory installed on the liner (the one with the tangs that point downwards. Book says factory installed captive shims and a service shim can’t be used together I thought. He brainf*cked me on that one. I’ve heard of stacking service shims but never captive/brass or ss shims together. I know big bore and small bore liners either have a factory captive shim or do not. Thoughts?

Also, if you do not raise the liner height above factory, you are not going to extend the engines life by very much any ways.

There is a lot to be done that is "not in the book" of you want a quality build for all the moneys spent. You want a proper million mile build.. then you have to do all this stuffs...

ref: http://rawze.com/forums/showthread.php?t...6#pid70606

I have never had an issue with using more than one shim (the one that comes on the new liner + a cummins hardened brass shim (or ss shims as second choice) to raise the liner height with.

Also, bad delete programming (and/or lugging the engine to death below 1500rpm its whole life) is the #1,#2 reason they dance in the block to begin with. If that thing has a delete programming it then it needs to be copied out of the ecm and e-mailed to me for a proper review to ensure it is not going to shorten the engine life or contribute towards another failure.

What are your thoughts behind the captive shim introduction in the first place? I’ve figured and heard it because they would rather have the captive shim wear or service shim wear into each other rather than trash a counterbore ledge like they have in the past.

One question I do have is, when using a liner with a captive shim and you install a service shim, is the liner machined a bit to take up the tolerance that the captive shim introduced, or do you have to factor that into your cut depth? I.e take out an extra .001 because the captive shim may be .001? Same question posed for the 152 liner if it comes with the loose shim, is the liner machined down some on mid stop to compensate for the use of the loose shim (does it measure .032?)?