I was pulling a work trailer about 60mph its only 4000lbs and it started hammering like a rod or rocker i got it home pulled the cover the the rockers are good springs are good full of oil . I cant think when iv ever seen a cummins with 130000 miles have this happen sounds like im pulling the head off tonight to take a look. any one have this happen ???? how hard is it to get the oil pan off the motor in a 4x4 dodge 2001 ???? thanks for any help you can give me

 

I would pull the injectors out first. My brothers truck sounded like a rod knock & turned out to be bad injectors. Throw another set of sticks in & see if it goes away.

 

Be sure to check the flywheel and torque converter bolts if it's an auto.

 

Check the valve lash clearances. When I did my head gasket, I went and did my second retorque and did the valve lash setting in a rush. I must have not tightened down one of the locknuts enough. Well, the adjuster bolt backed its way out and it started as a slight knock, by the time I got home it sounded like a gun firing. Scared the poop out of me.

Turns out the pusnrod came out of its slot on the lifter and was just enough to make it sound like a knock.
Just a suggestion,, hope thats what it is.

 

i thanks i will look at torque converter bolts but it makeing the sound in the top and frount about hole #2 i did a lazer temp on the each ex and hole #1 was cooler so i put one injecter in there mabe i will put all my summer sticks back in ther 240 j&l man does a bad injector sound like a rod knock? have had a bad injector in my semi and it just had a bad miss to it and didnt knock like this but i will put my other sticks in it to see thanks for all the help

 

My brother was freaking out when his truck did it, sounded just like a rod knock. I said "Brian, I wasn't hammering on your truck, just driving normal & Bam!!!" It turned out to be 6 bad injectors & one had went really bad. I would swap them & adjust the valves. Hopefully it wasn't a valve seat letting go.

 

i did do a re torque the day befor it happend and did pull the rockers ,i will look agen but things looked ok when i looked thanks

 

I agree, it's pretty easy to pull the inspection cover and look, but look closely. On my first gen, the first time it sounded like the whole top end had gotten trashed but it would still pull. The second time it sounded the same but it quit pulling. The second time the center of the flex plate broke out and was very hard to see.

 

Sounds like you might not have gotten a pushrod seated just right, and it seated itself. If its out on one (cool cyl) I would pull that pushrod and check it for straightness.

 

not the injectors just tryed that ,looked at the rockers and rolled the motor over no loose ones and thay all have the same lift and lash im going back out to look at the trans later got some other things to do right now thanks for the help

 

When mine started hammering, it was a melted piston.







No worries, it was only $10,858.00 to fix it.

 

how did you do that ???

 

That pic still makes me cringe

I'm hoping that it's a LONG time before I ever see what one of my bores looks like....

jh

 

You coulda bought a lot of stuff with 10,858!

 

Dieseldude4x4, now your just scaring the guy!!!