1999 7.3L Roller Camshaft Flat Lobes and Cam & lifter failure Pictures - Diesel Forum - TheDieselStop.com
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99 & up 7.3L Power Stroke Engine and Drivetrain Discussion of the 99 & up 7.3L Power Stroke diesel engine and drivetrain in the 1999-Up Super Duty trucks and Excursions. No gas engine discussion allowed except on transmissions and drivetrain that pertain to all models. Please confine discussion of topics in this forum to those items that are specific to the 7.3L Power Stroke engine.

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Old 10-10-2009, 10:46 PM   #1 (permalink)
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1999 7.3L Roller Camshaft Flat Lobes and Cam & lifter failure Pictures

Hey guys, thought I would share, in the event your diagnosing a knock, and find that you are have a push rod / lift problems, from lack of lift, this could be lurking in your block.

I bought this motor as a dressed long block spare, and it was sold to me with a knock. So I'm tearing it down, the last item I pull out is the cam. The one lobe is so smashed, it almost didn't clear the block journals! What I cant quite figure out is why the lifter retainer on the really bad looking lifter is broke in half ?

And the lifters, the one on the left, the bottom of the lifter itself, not just the roller was hitting the cam, and the roller still rolls, the needle bearings are still in there. The one on the left came from the really bad lobe, then the second most screwed up in the middle and the one on the right is normal worn. Look at the height difference between them!

I'm thinking I need to have a look at the heads, there might be a missing part to this story. Anyhow, Ive never seen a cam this screwed up so I thought I would share, this came out of an early 99.





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Old 10-10-2009, 11:03 PM   #2 (permalink)
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I see a lot of heat stress, did he run it with out oil?

I've only torn apart a hand full of motors but I haven't seen that before. As far as the bad journals.....wow!
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Old 10-10-2009, 11:09 PM   #3 (permalink)
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I see a lot of heat stress, did he run it with out oil?

I've only torn apart a hand full of motors but I haven't seen that before. As far as the bad journals.....wow!
I agree, that's one UGLY cam. The blue heat marks on the cam means that thing must have been SMOKING something fierce. Someone must have driven many, many miles with earplugs in.
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Old 10-11-2009, 10:08 PM   #4 (permalink)
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JEES!

how the hell could he ignore that noise!
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Old 10-11-2009, 10:26 PM   #5 (permalink)
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looking at the two lobes again......something wasn't lifting. Inspect everything above the lifters! Something wasn't going up and the poor came just kept pounding away. That should have been a hellasious noise and one hell of a rough idle......

Edit: I continue to look at those pics, and is it just me or do the lifters have heat stress also? I'm starting to think that someone put a roller set into something that wasn't made for it....I keep racking my brain trying to think what could cause that kind of damage to a roller set up.....hell any cam!
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Old 10-11-2009, 10:59 PM   #6 (permalink)
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No, this didn't come out of some random motor somebody tried to put a roller cam in, it came out of a 99 PSD. It did not appear the motor had ever been apart, not the long block anyway. Head gaskets appeared to be original. I can see it had had the oil pan off it at some time. Keep in mind, I bought this sitting on a pallet as a core, and was told it had a knock and yes, it appears for some time. I popped off the heads and shelved them, did not dismantle them (didn't notice any valve damage, wasn't looking either).

As far as the pistons, none had any valve damage. I could very well have a stuck valve though, push rods where all pretty straight, no bents ones jumped out. I was thinking the valve train would take a hit before a cam or lifter would, just by the capacity of the metals themselves. I am in no way claiming I know how this failed, I figured if I posted it here, somebody has probably seen this before and would chime in as to what happened. My truck runs fine and I don't need the motor now that I don't have work, I'm just bored and had time to take this apart and was a little shocked when I looked in and saw this!
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Old 10-12-2009, 02:19 PM   #7 (permalink)
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I've seen that before on a Chevy big block that one of our drivers ignored the oil pressure guage untill the engine siezed. I would sure check the lifter bores for galling and to be sure that they are still round. Spend a lot of time cleaning that block as those peaces of cam have to be in there somewhere. I could not believe that the driver didn't notice the noise that had to be coming from that motor.
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