Dodge Cummins Diesel Forum - Reply to Topic
3rd Gen. Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine , Transmission Ect...NO ADVERTISING

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  Topic Review (Newest First)
08-28-2019 09:43 PM
T Bell
Quote:
Originally Posted by smokenoise View Post
Sounds like you need to check your overhead/valve lash. Sounds like Something is not ok on the top end.
You hit the "valve" on the head. Took it to a local shop and he said my #6 valves needed adjusting. $200 and no more banging inside my engine!!!! So now, I need to tighten up my exhaust downpipe (exhaust leak) and hook a heavy trailer to it to seat the rings. Thanks for all the advise guys.
07-21-2019 04:21 PM
T Bell
Quote:
Originally Posted by Squeaksleaks View Post
Did you replace the rocker arms doing your rebuild? Its possible for the pushrod to slip out of place between the lifter and rocker arm if the lash is improperly adjusted.

I failed to adjust one of my new exhaust rockers during my rebuild and it sounded similar to your video after it worked loose.
Interesting. I did removed and replaced the rockers. I started it today without the valve cover and noticed that all the rockers were moving (so that would rule the pushrod out of alignment, right?). I also noticed the intake horn had alot of oil residue in it. This could be from the intercooler before I rebuilt everything. I had tons of blowby and smoke out the tailpipe. Now, no blowby or smoke but now I have this knock. I also noticed that the #1 injector line was vibrating more than the rest. Just pieces to the puzzle.

I will recheck my lash hopefully tomorrow if it stops raining. I really appreciate everyone's help with this.
07-20-2019 04:00 PM
Squeaksleaks Did you replace the rocker arms doing your rebuild? Its possible for the pushrod to slip out of place between the lifter and rocker arm if the lash is improperly adjusted.

I failed to adjust one of my new exhaust rockers during my rebuild and it sounded similar to your video after it worked loose.
07-19-2019 10:46 PM
ssteve It will cause a knock if the valve seat took a dump and is hitting the piston!
07-19-2019 05:04 PM
T Bell I like that theory better (for labor reasons) but will that cause it to knock?
07-15-2019 11:34 PM
smokenoise Sounds like you need to check your overhead/valve lash. Sounds like Something is not ok on the top end.
07-15-2019 10:40 PM
T Bell Well, I finally capped off #6 to no avail. I then capped off #5 with #6. Still got the knock. I put my IR gun on the exhaust ports and #1 & #2 were cooler than all else. Capped those two off, still knocking. I can also hear a huff sound when I'm cranking it. Any help would be greatly appreciated.
07-09-2019 11:49 PM
T Bell
Quote:
Originally Posted by Broaner View Post
Cap off the rest of the injectors to isolate the knock.
I was able to get almost all of them capped off today but it started raining on me. But I did hear 2 knocks when I capped off #5. Not sure what that means but it does make me feel better knowing that it's injector related. I'll try #6 tomorrow after work.
07-08-2019 04:01 PM
Broaner Cap off the rest of the injectors to isolate the knock.
07-08-2019 03:11 AM
GRUNT 11B I had a knock after i changed my injectors. I bumped the started a number of times to make sure the system had purged all the air out and charged up my batteries. After that the knock was gone when i started it.
07-08-2019 12:59 AM
T Bell Well, I got it running but it doesn't sound pretty.
https://youtu.be/M8gwNtrJVMM
I cleaned the injectors, connecting tubes, lines and fuel rail with brake cleaner. Followed the procedure for the connecting tube this time. I primed the system (bumped the key 3 times), then tried to start it. It started a little rough the first time. With this loud knock. I crunk it about 4 more separate times and it fired right up pretty easy. Except for this loud knock. Injector knock? I capped off #1 and it still sounded the same. I'll try more diagnosing tomorrow. Any help before then would be much appreciated.

And I may have forgot to tighten the #6 injector because I was so close to getting it done last time. I made sure I tightened them all down this time.
07-07-2019 10:01 PM
02smokin Did you torque them originally or just tighten to “mechanics tight”?
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