All Things Mk5 > How to Guides / Troubleshooting

Cylinder Bore Scoring

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rhyseyness:
Evening all,

Long time reader/lurker first time poster.
I recently had my cambelt snap on my mk5 gti while I was driving. Started the teardown process to see how bad the damage was.
I've just got the head off today, and obviously almost all the valves are bent (as expected), but more worryingly, there is some significant scoring on the clyinder bores.
This is the first time I've had the head off since owning the car, so no idea whether this damage was caused by the valves hitting the pistons, of if it was there before this... event.

I'd like to know what people think in terms of the severity and whether there's anything I can do. I know it's hard to tell just from photos.
I suspect I need a new block, but would be very happy to be told otherwise!
Thanks in advance









Note: I had the cambelt changed 15k miles (2 years) ago by a garage, but I'm not convinced they fitted the correct belt from the state it was in when it came out.

coolhandluke:
The right belt should be good for at least 4 years. Keep it as evidence and go back and challenge them.

LC5F:
Cam belt should definitely last longer.
I am sorry to say the scores in the bores don't look good - if you can catch a finger nail in the scratch it is too deep.

With them being bright steel, they look fresh - if they were old I would expect some debris in the scores. actually, looking at the No.1 the score continues under the tide mark at the top of the bore, so it looks like its been there a while.
I experienced a belt fail - the valves just hit the pistons, nothing falls off unless you dropped a valve.

rhyseyness:

--- Quote from: coolhandluke on January 29, 2023, 01:23:20 pm ---The right belt should be good for at least 4 years. Keep it as evidence and go back and challenge them.

--- End quote ---

Do you think even though it's been 2 years since they fitted the belt there'd be any recourse?
I agree the belt should last much longer, but I don't have any evidence that I wasn't just very unlucky and got a defective belt by no fault of theirs.
I don't really see any benefit in going back to them to say "when you fitted this belt 2 years ago, it might have been the wrong one because it's failed early in its life."
Short of "ok thanks for letting us know" I don't know what they'd be able to do. Highly doubt I'd get any money out of them with my distinct lack of evidence outside of a receipt and a snapped unmarked belt!


--- Quote from: LC5F on January 29, 2023, 08:38:11 pm ---Cam belt should definitely last longer.
I am sorry to say the scores in the bores don't look good - if you can catch a finger nail in the scratch it is too deep.

With them being bright steel, they look fresh - if they were old I would expect some debris in the scores. actually, looking at the No.1 the score continues under the tide mark at the top of the bore, so it looks like its been there a while.
I experienced a belt fail - the valves just hit the pistons, nothing falls off unless you dropped a valve.


--- End quote ---

Thanks for the reply!
The scores on 1 and 3 fail the fingernail test miserably unfortunately.
Appreciate you confirming what I already suspected would be the case!


Anyone know of a good shop to supply/fit a new engine for me?
Preferably around SE London with collection options!
I'm assuming that's more cost effective than having this engine re-bored, head repaired and rebuilt.

I've seen a few second hand options on Ebay, but I'm terrified of the condition of any engine I'm going to put in myself, as there wouldn't be a lot I could do if it didn't run, or died after 1000 miles!
Was happy to just have the head reconditioned and new valves fitted to mine, because I'd know the condition of everything at that point (obviously that's no longer an option with the condition of the cylinders).
Ideally would like a garage that can supply and fit a motor (ideally a quality reconditioned one) to give me some peace of mind/warranty!

Any thoughts/input appreciated. Especially if there's a completely different option I haven't considered!

bobby_fodge:
Could break your car to get some money back and get another car?

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