ISX Cylinder liner sinking causing head gasket failure

N14 is a press fit, right below the counterbores. They use o-rings at the bottom of the liner, and brass sealing rings, under the liner flange. The liner cannot move, like the ISX liner can move, causing the brass shim to fail.

 

I’ve got a 2005 ISX all apart at the moment.

The sleeves look really good with no pitting.



They have no shims.

Counter bores also look really good.

My boss ordered a PAI rebuild kit.

I see the new liners came with brass shims installed.

Picture here I’m doing measurements with both old no shim sleeve and new sleeve with brass shim.



Both came within .012” protrusion.

Told my boss that we should get the old sleeves re-honed and reinstall them

 

Pretty sure you should be measuring protrusion with the liner clamped? ESN?

If there’s no fretting and the block looks good what’s wrong with rebuilding with stock parts?

 

I did have them clamped, I posted the wrong picture.

I have two pictures, one with the bolts and the other without.

My boss thought the PAI kit would be a good upgrade kit from research that he’s been doing.

 

.012 is great. I have always had good luck with PAI kits. They come with everything you need.

 

Goodysnap: ESN

 

Do not use the brass shims. They smash with time. Use only stainless steel shims. I have some that will get the liner up to the high side of the spec. No machining necessary. Call me 7173688532.

 

I shall talk to my boss about this tomorrow.

 

You should be clamping them, with the Cummins crossbar tool, and the clamp down screw torqued to 100 ft. lbs. The liners usually push down, .001"-.0015", when you do that. Most mechanics, that I work with, try to run them at .014" to .015".

 

Interesting, I will start checking the brass shim out more closely. I know when I cut counter bores the first cut will always show a low edge on the exhaust side, sometimes it can be several passes before it trues up. Cat uses stainless shims that stand up well, wonder why Cummins didn't. Have a x15 that I just cut on Friday and they are the same as all the earlier isx design. same brass shim and brown/burnt fire ring head gasket at 8000 hrs. (engine was dusted is why it came apart) We to cut for max protrusion of .014"