2013 ISX 15 rapid sudden coolant consumption

[Rawze]

(05-24-2025 )Nerv Wrote:  Great I will go for the 0.20 shims, thanks for that info I now got proper measurements. I had the damn micrometer rod in backwards for f##k sakes! Lol.

Im getting an average of 4.725, there is variances across the 4 points on cylinders 1,2,3,4, and 6. Which equal to 0.001,0.002,0.001,0.003,0.001 respectively. Do these differences still need to be cut to ensure an even surface all around? I subtracted the lower from the highest measured points from each cylinder like the manual says to. I am shooting for 0.016, so I need to be at 4.739 with a 0.20 oem shim. So 0.014 needs to be cut to ensure 0.016 protrusion(0.015) when head is torqued properly per your guide.

Let me know if im missing something, appreciate the patience Im doing my best!

Cummins official spec is slightly higher ( at .004" across the 6 holes, max of 0.002" from adjacent holes), but I have seen issues with this much variance on rebuilds.

For a quality build however ...

The allowance is 0.001" from one side to the other within one hole, hopefully not lower on the exhaust side.

The allowance from one hole to another is 0.002" with a max variance of 0.002" across all 6 holes as well.

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Here is a fine example of the OEM not caring, and me fixing a brand new short-block, it and its done right...
https://rawze.com/forums/showthread.php?...1#pid11611