Head cam scoring cause?

[slybunda]

have a look at these pics, what could have cause this to happen?

[stevieturbo]

Looks pretty dirty in there for a start.

But in general...a lack of lubrication and/or dirt getting in.

[slybunda]

This was a rebuild engine on startup it had no oil pressure but assembly grease was used so should matter. It was run for a couple of minutes. Lack of oil aside i wouldnt have thought it would be so bad after a short run.
190e 2.5 cosworth head so not easy to come by.

Can it be repaired?

[Zener]

Well all the cam buckets are fked too especially the last pic with what looks like a gouged non rotating bucket I would be measuring and inspecting the camshafts too and like mentioned already contaminated lube and previous wear from old age and use by the looks , I bet the cam bearing caps look horrible to seeing they see loads from the valve springs also

Edited by Zener on Friday 16th July 15:28

[stevieturbo]

slybunda said:

This was a rebuild engine on startup it had no oil pressure but assembly grease was used so should matter. It was run for a couple of minutes. Lack of oil aside i wouldnt have thought it would be so bad after a short run.
190e 2.5 cosworth head so not easy to come by.

Can it be repaired?

oil pressure always matters.

rebuilt when and why ? And do you know 100% those journals were good during the rebuild ?

Are you saying the engine ran for 2 minutes with no oil pressure ?

Yes, most things can be repaired....finding someone to do it, maybe a little more difficult. But that could definitely be welded up and re-machined.

This crowd building a custom new billet A-series engine would certainly have the skills and abilities to repair

As to how much work they do for the general public or prices...is another matter.
https://www.facebook.com/Ascaso-Engineering-111874...

[Evoluzione]

It hasn't been run dry, it's dirt. How about some specific history, rather than us just playing guessing games?
It can be skimmed and line bored, but it's not cheap.

[stevieturbo]

Evoluzione said:

It hasn't been run dry, it's dirt. How about some specific history, rather than us just playing guessing games?
It can be skimmed and line bored, but it's not cheap.

True, as always lack of info does get irritating.

And given the blackness of the engine and damage, it looks like a high mile diesel engine. Doesnt look like anything rebuilt any time recently

[littleredrooster]

Blimey - I've seen starship-mileage Pug diesel engines looking better than that! 'Fairly-well shagged' is the phrase which comes to mind.

I'm struggling to think that it may have been rebuilt at all. Seen something similar when an oil filter element ruptured through neglect and allowed the accumulated filth to wash round the motor.

[Boosted LS1]

As above it's contamination and costly to repair. It'll be interesting to see the crank/rod bearing shells because particles will no doubt be embedded in them. Save your oil filter to. You may want to see if there's swarf in there.

ETA, I 'm also sure the followers weren't rotating properly in their bores.

Edited by Boosted LS1 on Sunday 18th July 09:11

[Penelope Stopit]

Have rebuilt 2 engines that I've neglected, not enough oil and filter changes, all the shells looked good

[NMNeil]

If the cam looks like that, I wonder what the main and big end bearings look like.

[slybunda]

Engine was fine to begin with, it needed to be stripped down and painted new timing chain kit and piston rings etc
From what iv been told when assembled it had assembly grease and oil in it but apparently oil was not flowing to the top end.
From what people are saying on here it doesnt seem to be just a oil issue but more to do with contamination.
Looking like a replacement head from a doner car is the way forwards but even thats looking to be a few grand.

[stevieturbo]

slybunda said:

Engine was fine to begin with, it needed to be stripped down and painted new timing chain kit and piston rings etc
From what iv been told when assembled it had assembly grease and oil in it but apparently oil was not flowing to the top end.
From what people are saying on here it doesnt seem to be just a oil issue but more to do with contamination.
Looking like a replacement head from a doner car is the way forwards but even thats looking to be a few grand.

And find a competent builder who doesn't build engines off the floor after a sandstorm with his eyes closed.

[steveo3002]

looks like more than 2 mins with no oil pressure ...altough if its such a costly engine who was running it 2 mins with the oil light on?

[E-bmw]

slybunda said:

Engine was fine to begin with, it needed to be stripped down and painted new timing chain kit and piston rings etc
From what iv been told when assembled it had assembly grease and oil in it but apparently oil was not flowing to the top end.
From what people are saying on here it doesnt seem to be just a oil issue but more to do with contamination.
Looking like a replacement head from a doner car is the way forwards but even thats looking to be a few grand.

Judging by the state of the top end, I wouldn't trust the bottom end either.

[Zener]

stevieturbo said:

And find a competent builder who doesn't build engines off the floor after a sandstorm with his eyes closed.

This ^ it looks horrible , and like mentioned previously I would not trust the lower end

[LimSlip]

It' should be spotless inside if just rebuilt properly, that looks like the engine has been assembled inside a coal mine.

[steveo3002]

yep thats nothing like clean enough , are you sure its your own parts returned and not a used /scrap part

wheres all the black oil and bit come from on a engine thats ran for 2 mins

[Boosted LS1]

Assembly grease would account for the colour. The 3rd pics interesting. There's been no pickup in line with the oil feed which to me suggests minimal oil flow but still some.

How are the other cam journals oiled?

[slybunda]

engine has gone for repair now will see how it is after.