Had a catostrophic injector failure on an old Cummins ISX last Tuesday

I was hauling a load of lumber up I-5 near Redding when the number five injector stuck wide open and filled the cylinder with fuel, and I had to pull over and call for a tow after I saw white smoke pouring out the exhaust and the oil level went up by three gallons, has anyone else seen an injector cup crack from this on a 2011 model?

3 comments

3 Comments

jessica7071mo ago

We had a 2012 ISX in our fleet last year that did the same thing on cylinder three. The cup actually cracked right at the bottom where it seats into the head, and fuel got past the O-ring and into the oil pan. We ended up pulling the head and finding the crack with a dye test. The machine shop said it's common on those early DPFs trucks because the heat cycles get wild after regens. Cost us about $4,200 to fix with a reman head. Took two weeks to get parts too.

river9521mo ago

$4,200 is less than my last divorce cost me, and at least that one came with a working fuel system. Glad you caught it before it turned into a $10,000 head job.

aaron_mitchell1mo ago

That 4,200 dollar figure hits close to home... I'm wondering if your machine shop mentioned anything about the cylinder head bolts being stretched on those early ISX models after a regen heat cycle failure like that. Did they have to replace the bolts or were they reusable.