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Author Topic: Bore damage. Game over for BMW?  (Read 12672 times)

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X30XE

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Re: Bore damage. Game over for BMW?
« Reply #45 on: 11 March 2017, 09:32:24 »
Quote from: JamesV6CDX on 11 March 2017, 02:15:39
Are we SURE this happened with it running, and not since I took it apart?

Reason for asking:

I found this (below) photo, taken a few weeks ago, from after I took the head off, but, before I spun the crank far enough today, to fully lower the no4 piston (the one in question).

The wall looked like this:



So you can see in this picture, immediately after taking the head off, the marks DONT appear to go all the way down, and only stop at where the piston had been sat? Or am I mistaken?

Would this not imply, that whatever is in there, caused the marks to go all the way down there today, when I turned it by hand?

Looks like the marks go down to the top of the piston to me squire  ???

As mark says... polish it out and re-spin it and you'll know.
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Doctor Gollum

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Re: Bore damage. Game over for BMW?
« Reply #46 on: 11 March 2017, 10:01:44 »
It isn't isolated to that one cylinder... ergo, unlikely to be debris related ::)
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STEMO

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Re: Bore damage. Game over for BMW?
« Reply #47 on: 11 March 2017, 10:45:35 »
Quote from: tunnie on 11 March 2017, 08:12:31
Quote from: STEMO on 11 March 2017, 06:56:24
You start your thread with 'bore damage'. I can't see any damage, just a slight marking (not scoring). You have your way of doing things and other people theirs. Personally, I'd put that back together and run it.

Well, what you waiting for? Pop over and put to back together for him. Sure you'd have it done in what, 20 mins?  :D
How old are you? 30? I was stripping engines before you were born, lad, you're still shitting yellow.  ;D
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Sir Tigger KC

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Re: Bore damage. Game over for BMW?
« Reply #48 on: 11 March 2017, 10:50:30 »
Quote from: STEMO on 11 March 2017, 06:56:24
You start your thread with 'bore damage'. I can't see any damage, just a slight marking (not scoring). You have your way of doing things and other people theirs. Personally, I'd put that back together and run it.

This!  :y
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Re: Bore damage. Game over for BMW?
« Reply #49 on: 11 March 2017, 11:54:22 »
Quote from: STEMO on 11 March 2017, 10:45:35
Quote from: tunnie on 11 March 2017, 08:12:31
Quote from: STEMO on 11 March 2017, 06:56:24
You start your thread with 'bore damage'. I can't see any damage, just a slight marking (not scoring). You have your way of doing things and other people theirs. Personally, I'd put that back together and run it.

Well, what you waiting for? Pop over and put to back together for him. Sure you'd have it done in what, 20 mins?  :D
How old are you? 30? I was stripping engines before you were born, lad, you're still shitting yellow.  ;D

You must be known all over the world for your scouse charm. :)
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STEMO

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Re: Bore damage. Game over for BMW?
« Reply #50 on: 11 March 2017, 12:05:30 »
Quote from: Doctor Opti on 11 March 2017, 11:54:22
Quote from: STEMO on 11 March 2017, 10:45:35
Quote from: tunnie on 11 March 2017, 08:12:31
Quote from: STEMO on 11 March 2017, 06:56:24
You start your thread with 'bore damage'. I can't see any damage, just a slight marking (not scoring). You have your way of doing things and other people theirs. Personally, I'd put that back together and run it.

Well, what you waiting for? Pop over and put to back together for him. Sure you'd have it done in what, 20 mins?  :D
How old are you? 30? I was stripping engines before you were born, lad, you're still shitting yellow.  ;D

You must be known all over the world for your scouse charm. :)
Thank you  :)
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GastronomicKleptomaniac

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Re: Bore damage. Game over for BMW?
« Reply #51 on: 11 March 2017, 12:21:09 »
Quote from: STEMO on 11 March 2017, 12:05:30
Quote from: Doctor Opti on 11 March 2017, 11:54:22
Quote from: STEMO on 11 March 2017, 10:45:35
Quote from: tunnie on 11 March 2017, 08:12:31
Quote from: STEMO on 11 March 2017, 06:56:24
You start your thread with 'bore damage'. I can't see any damage, just a slight marking (not scoring). You have your way of doing things and other people theirs. Personally, I'd put that back together and run it.

Well, what you waiting for? Pop over and put to back together for him. Sure you'd have it done in what, 20 mins?  :D
How old are you? 30? I was stripping engines before you were born, lad, you're still shitting yellow.  ;D

You must be known all over the world for your scouse charm. :)
Thank you  :)

Its guaranteed if Crimestoppers is shown abroad...
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Re: Bore damage. Game over for BMW?
« Reply #52 on: 11 March 2017, 20:30:49 »
Have stripped and rebuilt loads of engines in my time - my advice if you can't feel scoring with your finger/fingernail, touch of wet 'n dry, and put it back together.  :y
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Re: Bore damage. Game over for BMW?
« Reply #53 on: 11 March 2017, 20:37:17 »
Silly question, but could it be carbon from a build-up of burned oil in the gudgeon pin end-hole (not a very technical term, sorry) as a result of the turbo failure? If that is a possibilty, wipe it off and continue the rebuld, forgetting all about it..... 8)

Ron.
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Re: Bore damage. Game over for BMW?
« Reply #54 on: 11 March 2017, 22:04:00 »
Just to reiterate...

THIS 'WEAR' IS CLEARLY VISIBLE IN AT LEAST ONE OTHER CYLINDER BORE...

Whatever caused it is present across the engine, not confined to one cylinder.

Apologies for yelling, but everything thus far seems to be stuck on one bore.
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Andy H

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Re: Bore damage. Game over for BMW?
« Reply #55 on: 11 March 2017, 22:10:08 »
Quote from: Doctor Gollum on 11 March 2017, 22:04:00
Just to reiterate...

THIS 'WEAR' IS CLEARLY VISIBLE IN AT LEAST ONE OTHER CYLINDER BORE...

Whatever caused it is present across the engine, not confined to one cylinder.

Apologies for yelling, but everything thus far seems to be stuck on one bore.
I think you must be looking at a different picture to the one I can see :-\
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Doctor Gollum

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Re: Bore damage. Game over for BMW?
« Reply #56 on: 11 March 2017, 22:22:49 »
Picture in reply #40 same vertical markings on bore 6...
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JamesV6CDX

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Re: Bore damage. Game over for BMW?
« Reply #57 on: 11 March 2017, 22:41:40 »
Quote from: Doctor Gollum on 11 March 2017, 22:22:49
Picture in reply #40 same vertical markings on bore 6...

Sorry for lack of update had a bereavement today. Old and expected but still sad  :(

Having cleaned no6 with just a rag it doesn't have the same marks, although the pic Al suggests does look that way

No4 almost polished out and isn't overly coming back with cranking

I will post pics as soon as I'm in a position

Big thanks to you all.

:y
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Re: Bore damage. Game over for BMW?
« Reply #58 on: 11 March 2017, 22:57:41 »
Sorry to hear that. Never a good time, however anticipated.

Markings may simply be a side effect of cranking the engine dry without causing any lasting damage :-\
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JamesV6CDX

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Re: Bore damage. Game over for BMW?
« Reply #59 on: 11 March 2017, 23:02:56 »
Quote from: Doctor Gollum on 11 March 2017, 22:57:41
Sorry to hear that. Never a good time, however anticipated.

Markings may simply be a side effect of cranking the engine dry without causing any lasting damage :-\

Cheers mate. And I really hope so :y
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