zetec
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| posted on 17/1/08 at 08:31 AM |
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Piston ring problem...bugger!
Replacing a zetec piston last night I managed to break the middle piston ring  . All the others are fine so don't really want to buy a whole
new set. I do have a spare set for a zetec which are fit the bore perfect and have the same profile...but...they are about 5 thou (inches) thinner and
therefor are slightly looser in the ring groove. I suspect this will make little difference but thought I would seek the wisdom of those more
experienced!
" I only registered to look at the pictures, now I'm stuck with this username for the rest of my life!"
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nitram38
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| posted on 17/1/08 at 08:57 AM |
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Don't risk it, buy another set or you may be able to get one from your local engine re-conditioners.
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JAG
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| posted on 17/1/08 at 09:18 AM |
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I think I would replace the whole set - I'd be really upset if I built it with this 'new' ring and then had trouble with it that
meant I had to strip the engine to replace it later.
I've never bought piston rings (or replaced them myself) but they can't be that expensive or difficult to get hold of can they?
Maybe they are, maybe that's why your thinking of doing this hhmm
Justin
Who is this super hero? Sarge? ...No.
Rosemary, the telephone operator? ...No.
Penry, the mild-mannered janitor? ...Could be!
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zetec
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| posted on 17/1/08 at 09:39 AM |
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New set probably about £70. The issue is that the zetec bore needs to be re honed to allow the rings to bed in properly...If I just change the one I
should be OK as the main and oil control rings are already run in the old bore.
" I only registered to look at the pictures, now I'm stuck with this username for the rest of my life!"
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r1_pete
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| posted on 17/1/08 at 10:15 AM |
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Imagine you build it up and the pot with the rogue ring in is down on compression, all that work for an 'un balanced' engine. Not saying
it will happen, but is it worth the risk, I'd go all out to source a new ring.
Rgds.
Pete.
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pewe
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| posted on 17/1/08 at 10:39 AM |
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You deffo. shouldn't fit a ring that's too narrow as it will chatter in the groove and wreck the piston.
As for a one-off someone must have one kicking about - just make sure it's within tolernace before fitting i.e. place it in the bore and measure
the gap with feeler guages to check - you should be able to obtain that info in the appropriate Haynes manual.
Cheers, Pewe 
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zetec
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| posted on 17/1/08 at 10:56 AM |
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You are all right...Found engine parts supplier who will sell me a single cylinder set, so I'll do the right thing and fit the correct
one...cheers chaps.
" I only registered to look at the pictures, now I'm stuck with this username for the rest of my life!"
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jollygreengiant
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| posted on 17/1/08 at 01:14 PM |
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If you are replacing 'A' piston then the bore would need honing anyway. While you are honing ONE then you might as well do all FOUR and
fit a complete set of rings. At least that way you KNOW that you have done everything RIGHT and it will not need doing again.
Do it right and do it ONCE.
Beware of the Goldfish in the tulip mines. The ONLY defence against them is smoking peanut butter sandwiches.
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