24v Ate Cyl 2 Push Rod, Again. · CutterUp Diesel Lab

24v Ate Cyl 2 Push Rod, Again.

A few months ago I went to start up the truck and was greeted by thumping noises coming out the intake. Upon inspection I found Cyl 2 intake pushrod shattered at the top alongside the exhaust push rod with a bend. I was giving it the beans leading up to this to clear up the engine as I run about 30-40% waste oil to diesel. I replaced the injector and crossover tube thinking it was an overfueling event.

Now yesterday I was in the dump coasting without much throttle and then it started thumping out the intake. Again I pulled the valve cover to find the same cylinder had ate the push rod crown in the same exact way, but this time the exhaust rod was fine. I was able to pick out some of the shards and threw in another stock push rod then drove it 10mi back to my garage without any issues. I did overrev to 3k for a few seconds the day prior as I’m dealing with a shifting issue with the 47re (thinking it’s a tv cable or gov solenoid issue).

I’m new to working on Cummins/diesels in general but have a fair amount of experience building engines. Today I’m going to inspect everything a little closer and was hoping to get some advice on what to check/consider.

current game plan

-verify valve height is similar to other cylinders

-borescope #2 cylinder

-double check lash

-potentially buy another head/engine out of fear of bent valve (thinking it’s cheaper than getting a valve job/machining overhaul plus it’s a 53 block)

-drink until I feel better about driving the truck

Engine details

-Ppump’d with mildy built 175hp pump (flow maxed, 3/4k gov springs, #0 plate)

-103lb valve springs installed same time as Ppump

-75hp injectors

-Running Waste Motor Oil as fuel, 30%ish WMO usually

-.010/.020 valve lash

Happy Wednesday.

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24v Ate Cyl 2 Push Rod, Again.