12 valve knock - Diesel Bombers



12 Valve 2nd Gen Dodge Cummins 94-98 Discussion of 12 Valve 5.9 Liter Dodge Cummins Diesels with P7100 Injection Pumps

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Old 05-20-2013, 01:12 AM
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Default 12 valve knock

I got at 99 ram 2500 4x4 with a completely rebuilt 12 valve with mods. I blew my phat shaft 66mm turbo and had it rebuilt and machined to an 68mm. I put the turbo back on and ran the truck normal. It ran good all day then out of nowhere I hear a knocking noise and can't figure out what it is. I checked the oil and its good and don't see any leaks. Any ideas???
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Old 05-20-2013, 01:32 AM
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It could be the lift pump starting to go out. They will start to tick.
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Old 05-20-2013, 02:33 PM
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It's not really a ticking sound more of a knocking or tapping

---AutoMerged DoublePost---

The tapping/knocking doesn't go with the idle of the motor

Last edited by Cummins325; 05-20-2013 at 02:33 PM. Reason: Automerged Doublepost
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Old 05-21-2013, 04:49 AM
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ok,my bad
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Old 05-21-2013, 04:33 PM
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check your valve lash
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