Thought I had a lifter/valve train problem, open the hood and my fuel pump was slapping on and off the engine block sounding like a bad lifter. It had lost a stud and the remaining nut was almost backed all the way off. (tried to upload video, don't know how??)

So, anyone know the dimensions of the stud, or where to get one?
Thanks!

 

Hard to believe that oil was not pouring out as well.

Can you use a bolt instead of a stud?

I do not know the dimensions or thread pitch. IIRC all the nuts and bolts on the Cummins are metric.

 

It leaked some, it loosened up on a 80 mile trip, started ticking I did not bother to look until I got home, figured it was a lifter collapsed.
I ended up taking the remaining stud out and used (2) Allen head cap screws, 8mmx1.25-25mm.
All better now.

 

My motor has a similar problem. My lift pump stud broke off in the block and I can't get it out I have one stud holding it on and it's yet to really leak. Somehow anyway. I'm afraid one of these days the other stud is gonna let go though.

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Ahh-yuh...... solid lifters don't collapse.

 

Cummins quick serve is a handy tool to look up miscellaneous missing bolts to get part numbers to find out what the threads are.

Funny thing on this one is the cummins quick serve is based on engine serial numbers and it shows two bolts just like what you put in. I went and checked and my engine has bolts, its a '92, wonder when they changed to studs?

 

Pretty sure that my '93 had bolts.

 

My 93 has bolts

 

I think all the first gens had bolts. Not sure when they went to studs but I do know the 180hp ppump motor that came out of a 97 that was in my ford when I bought it had studs.

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Some replace the bolts with studs to make pump replacement easier.

Somewhere Infidel has posted the necessary info, just off the top of my head I thought it was M10X1.5 X 35 MM

 

I have seen several studs that where installed on 2nd gens, I have owned.
Like patdaly said.
People install them when replacing the lift pump - to make the pump easier to put on.

 

I just assumed it had hydraulic....seems like I get dumber by the day!

 

Preventative maintenance will keep the valve lash right. Perhaps you aren't keeping up with that.

 

Nope, Ive had 11 cummins trucks in the past 20 years including 2 new ones, ran one up to 740k, another to 460k and the others 80-300k... Never adjusted the valves in any of them, and never had any trouble. Every truck ran perfect when I sold them.
Unless there is a problem, I just stick to fluid and filters for engine PM's.

There was a time when I was not happy unless I rebuilt the engine in any vehicle I used as a daily driver...times have changed I guess! (I have not ran a gas engine pickup since 1989...so thats why)