Paccar head gasket permanent repair solution

I'd have to browse through the old newsletters, but I know Paccar said they were having issues with counterbore fretting on higher HP family engines on EPA 17. Solution was to go from lower press fit of liner to upper press fit and they made change to all blocks going forward.

 

I'll dig it up.

 

Does this mean that press fit sleeves of the past are better than what the manufacturers do now?

 

This is the best way I can show you the changes Paccar made to cylinder block and liners. Fretting was being found more in higher HP engines. Must have seen it early on because plans to make change were June of 2017. All engines went to new design 5th week of this year. Kinda ironic, Cummins fix for there counterbore issue's in the mid 80's was to go from upper press fit to lower press fit. 30 years later, Paccar is doing the opposite.

 

Fella please elaborate on your findings. We too have had repeat failures on the counterbores. Cutting them to the top end spec does nothing to ensure the liners are pressed firmly. As you mentioned, we are seeing it in the 500 HP range. Dissimilar metals causing severe corrosion and cavitation problems on the deck surfaces. We have seen one fail repeatedly on cylinders 4,5,6. Distinctively so, as the coolant surrounds those cylinders and eliminates corrosion build-up, while the cylinders unaffected are packed with rust around the liner. We have cut two this year, and both are showing signs of repeat failure. One has repeatedly leaked coolant through the head-gaskets only opening between 3 & 4 directly behind the turbo on the hot side and the secondary fuel module on the cold side.

 

Hello. I have the same problem witn EPA 17 engine, only with the second cylinder. Please tell me where you bought steel shim and what part number?