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Rod knock?

Old 05-11-2017, 03:58 PM
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About a month ago. I haven't run it more than 3000 rpm. Seems kinda wierd. Unless I might have adjusted one to tight maybe? At least someone other than me can hear it. My wife and son think I'm crazy. I've been at this for 3 days.

How bad would one have to be bent. Could u see it with the naked eye or not
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Old 05-11-2017, 04:05 PM
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I listened to a lot of 1st gen Cummins run and something sounds off with yours.
I am not sure what to check next, but I will back you up that is sounds funny. It seems to change as you loosen that 3rd injector line.
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Old 05-11-2017, 04:11 PM
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Yep. It goes away. I feel like I'm at a cross road. Pull head. And chance wasting a gasket set. Or pull the whole thing and just do it. I guess time will tell. I don't want to totally trash the motor by just keep driving it.
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Old 05-11-2017, 05:22 PM
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Naked eye will do it.
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Old 05-11-2017, 06:04 PM
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Pull the #3 valve cover
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Old 05-11-2017, 07:56 PM
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Could a blown head gasket sound like that if it vented to the outside without going into the water jacket? What about exhaust gasket?
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Old 05-11-2017, 08:04 PM
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Pull your push tubes out and roll them on a flat surface to see if they are still straight on your trouble cylinder
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Old 05-12-2017, 07:15 AM
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It does not sound good to me either. However, I don't think it's loud enough to be a rod knock, the audio quality could be deceiving though.

This is what I would do first, measure the valve clearance and then measure how far the valves are opening. You may need a dial indicator for this. Compare it against another cylinder. If it is off pull the pushrods and roll them on a flat surface to see if they are bent as deere country has suggested. If the valve lift is off but the pushrods are not bent you have a cam and/or lifter problem. Look at the pushrod ends and the rockers closely. If that is all good it's time to pull the head and oil pan then pop that piston out for inspection.
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Old 05-12-2017, 07:51 AM
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Originally Posted by 93flatbed View Post
How long ago did you do the springs? I've bent a push rod and it had a noise similar to that.
Does sound like a valve train issue, yes almost as if the firing sequence is off a bit.
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Old 05-12-2017, 08:46 AM
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I'll pull the push rod either late this evening or tomar morning. If that's not it I'll pull the head. This is not how I wanted to spend my summer. Anyway.

I guess I'll be doing some form of a rebuild. Gotta start pricing parts.
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Old 05-12-2017, 12:41 PM
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Mine had a knock in it when I bought it 80,000 miles ago. Still haven't figured out what causes it.
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Old 05-12-2017, 02:14 PM
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Maybe use an oscilloscope to locate noise?

Dan S is on the right track, report back. If you need push rods I have a few extra stock sets. Just cover shipping.
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Old 05-14-2017, 09:40 AM
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Thanks guys. I pulled the number 3 push rods yesterday. Look good. I gotta poor my house footers one day this week. After that I'll pull the head. Also want to talk to the local machine shop about prices. On a funny note my wife is now calling the truck christin. She thinks it possessed
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Old 05-14-2017, 10:14 AM
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poor my house footers??????????????????????????????????????????? ???????????????????????????????????
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Old 05-14-2017, 12:45 PM
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Yea. Pour footers. Gonna start to building a house. My wife and I have lived on the road for over 20 years chasing boiler outages all over the country. Gonna try and retired n 3 or 4 years. I built my garage first.
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