Lower End Noise

Posted May 13, 201213 yr

This post is for a friend who is having a knocking noise coming from mid section of eng. I say mid because it really does not sound like the lower end like you would hear on a gas motor, thats how I am compairing it because thats what I am used to. And never heard a diesel lower end knock just because they are so bullet proof.He was pulling a load up a slite hill and it started missing then blew out black smoke then started knocking so he pulled over and shut it off, towed it in. Still had good oil pressure when he shut it off :shrug: So we cleaned up a set of old injectors I had and put it back together and the miss is gone but still has knock. This truck is stock but for bhaf and exhaust, well it had a old Blue Chip box on it but that was a long while back. And it has 300k on it, SO motor.I think about it and it makes no sence, good oil pressure. Unless he broke a piston :think:

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Created 13 yr13 yr
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May 13, 201213 yr

Owner

Two thing I would do.1. Pull all 6 injectors and have them pop tested. Just to double check.2. Do a compression test to check the health of the cylinders.

May 13, 201213 yr

He was pulling a load up a slite hill and it started missing then blew out black smoke then started knocking so he pulled over and shut it off, towed it in. Still had good oil pressure when he shut it off So we cleaned up a set of old injectors I had and put it back together and the miss is gone but still has knock. This truck is stock but for bhaf and exhaust, well it had a old Blue Chip box on it but that was a long while back. And it has 300k on it, SO motor.

I think about it and it makes no sence, good oil pressure. Unless he broke a piston

Sounds to me like a partial melt down. That does happen with even stock trucks! He may have also had one injector not spraying properly and that would cause the same thing too. It will run for quite a while like that, but eventually........ :thud: