"A nasty garage man put a ball bearing in the engine"
Discussion
J4CKO said:
If we are comparing Piston/foreign body interfaces,
I had a valve head drop off in our Metro. It sucked the debris from the plenum into all but one of the cylinders writing off the whole engine.This story wouldn't be quite so bad if the replacement second-hand engine hadn't cost £23,000...
Ferg said:
J4CKO said:
If we are comparing Piston/foreign body interfaces,
I had a valve head drop off in our Metro. It sucked the debris from the plenum into all but one of the cylinders writing off the whole engine.This story wouldn't be quite so bad if the replacement second-hand engine hadn't cost £23,000...
hairykrishna said:
Why though?
Good question. It's some sort of t
ttery, but I can't think why. Perhaps someone is trying to make it look like someone else's fault?If you put a stainless ballbearing in a cylinder you'd get shotpeening marks all over the head, they'd be shallow indentations. Those marks are man-made, hammer and pointy thing. So someone's trying to hide something.
-Pete- said:
Good question. It's some sort of tttery, but I can't think why. Perhaps someone is trying to make it look like someone else's fault?
If you put a stainless ballbearing in a cylinder you'd get shotpeening marks all over the head, they'd be shallow indentations. Those marks are man-made, hammer and pointy thing. So someone's trying to hide something.
Depends on the compression ratio Shirley? Being a diesel, the piston would be pretty close to the head at TDC.ttery, but I can't think why. Perhaps someone is trying to make it look like someone else's fault?If you put a stainless ballbearing in a cylinder you'd get shotpeening marks all over the head, they'd be shallow indentations. Those marks are man-made, hammer and pointy thing. So someone's trying to hide something.
-Pete- said:
Good question. It's some sort of tttery, but I can't think why. Perhaps someone is trying to make it look like someone else's fault?
If you put a stainless ballbearing in a cylinder you'd get shotpeening marks all over the head, they'd be shallow indentations. Those marks are man-made, hammer and pointy thing. So someone's trying to hide something.
Agreed - not caused as described, even if it is a diesel with high compression ratio. - But interested how they did do it ttery, but I can't think why. Perhaps someone is trying to make it look like someone else's fault?If you put a stainless ballbearing in a cylinder you'd get shotpeening marks all over the head, they'd be shallow indentations. Those marks are man-made, hammer and pointy thing. So someone's trying to hide something.
busta said:
Depends on the compression ratio Shirley? Being a diesel, the piston would be pretty close to the head at TDC.
Don't you Shirley me! 
If the piston was close to the head, the dents in the piston and head would line up. And if not, a ball bearing of that diameter bouncing about in the cylinder wouldn't have the kinetic energy to cause such deep marks. No way Jose...
Edited by -Pete- on Tuesday 13th March 22:28
-Pete- said:
No chance, the waterways wouldn't line up, they're spaced differently. And this ultra-hard ball bearing wouldn't make twice as many dents on the piston crown as it did on the head. That's been done with a pointy thing and a hammer.
Have another look turn it round they line up perfectly you can see the shape of the valve recesses on the pistons and the amount of indentations between the valves matches. And as for the slightly diferent shaped waterways this is normal as it it all sealed by the gasket
The damage looks like it may have been caused by turbo bearing failure and ingestion of more than one ball bearing?.
Edited by cahami on Tuesday 13th March 23:03
Jakg said:
Could it not be the turbo let a ball bearing go?
Was just thinking this - knackered turbo dumps a single ball, at the same time as Mr. Mechanic gets the car taken to him.Can see why you'd get a mechanic to run solid brake lines if they have a) practice and b) the right mandrel tool to get good bends, no point doing it at home.
18:1 compression ratio on a diesel engine means a pretty tight squish, could easily press a ball bearing into the head/pistons.
Edited by Krikkit on Tuesday 13th March 23:31
-Pete- said:
Good question. It's some sort of tttery, but I can't think why. Perhaps someone is trying to make it look like someone else's fault?
If you put a stainless ballbearing in a cylinder you'd get shotpeening marks all over the head, they'd be shallow indentations. Those marks are man-made, hammer and pointy thing. So someone's trying to hide something.
There are marks all over the head though?ttery, but I can't think why. Perhaps someone is trying to make it look like someone else's fault?If you put a stainless ballbearing in a cylinder you'd get shotpeening marks all over the head, they'd be shallow indentations. Those marks are man-made, hammer and pointy thing. So someone's trying to hide something.
as if someone would go to all that effort to make the marks, which are obviously created by a bearing, and then put the engine back together to get it all coked back up!
JAHetfield said:
It does happen. I fitted an engine last year and someone dropped a washer down the inlet manifold and I know for a fact it wasn't me because it was bigger than anything I would have been using. Couldn't figure out why the engine was turning before I put it in but wouldn't afterwards. Lifted the head off and the washer was imbedded between the valves.
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