C15 Severe Coolant Loss

at those miles with that fault make sure you don't get caught out.

liner heights can be with in caterpillars new (in my opinion too big) spec. being 0.002" on any adjacent liner and 0.004" across the deck. old specs were 0.001" adjacent and 0.002 across deck. but with the removal of the 0.003 thinner plate from stock they have increased spec. (another story and something that grinds my gears)

I would personally look for a difference as I've measured engine that return "within spec" data, however when you remove the liner one or more corners of the liner bore on the deck have recession. I have seen as much as 0.003" recession on one corner after liner removal, however height were "within spec".

that corner of the liner will flex under load when cylinder pressure is greatest causing it to open up between the head gasket allowing cylinder pressure straight into the coolant gallery.

up to yourself but I would seriously consider using a 16:1 piston in your rebuild if possible as it'll eliminate this happening again.

 

Does it have the intercooler? Maybe that is all it is.

 

possible and well worth testing,

however he said injectors 1 and 2 had a rusty film on them which to me would indicate water in the crankcase.

that being said, definitely worth checking that pre cooler and the air compressor before tearing the head off

 

2004 chasis. Could be an MBN. Ain't known to many BXS to make that many miles!

 

It is very common for these heads to crack between the valves with no noticable issues. I would be looking for somewhere else the coolant was going in cylinder.

 

how did the liner protrusion measure up?
can you post a high resolution photo of each fire ring on the gasket?

the heads often crack between the valves. but very seldom do they crack through to the injector cup coolant gallery.

if the head was cracked through to the coolant gallery you'd come out to start it after its sat and cooled and it would either hydraulic lock or blow white smoke on start up and smell sweet.

your symptoms sound more like a sunken section of one or more liners allowing combustion gas to bypass the fire ring.

have a read of the SDP rebuild thread. I'd put money on yours being the same. would pay to have a close look at the gasket and head face