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#Post#: 55092--------------------------------------------------
piston rings
DIR By: divie
Date: March 21, 2013, 3:35 pm
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I picked up a set of +0.030" pistons for my 3 bearing 2.25
diesel today.
The original pistons had a scraper ring at the bottom which is
not fitted to the new ones although there is a groove for it.
Is this ring now left off? I can not locate it on parts lists at
my usual supplier and would have put the old rings from the
originals on but one is broken from when a hot spot broke up and
damaged the engine. I am also in the same situation as Nuggett
posted last week with excessive ring gaps ( could only get
britpart piston Grrr)
Any comments on this apprecieated.
#Post#: 55097--------------------------------------------------
Re: piston rings
DIR By: Redwinch
Date: March 21, 2013, 3:47 pm
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The bottom groove is for excessivly worn bores to try and
prevent oil passage up to the combustion chamber, DO NOT fit a
scraper ring in the bottom groove in an engine with rebored or
good cylinder walls, if you do it has a possibility of seizeing,
I found this out in the 70's on my 3 bearing diesel
#Post#: 55100--------------------------------------------------
Re: piston rings
DIR By: divie
Date: March 21, 2013, 4:03 pm
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Thanks Redwinch. I have put the glaze breaker down the bores and
they dont look to bad and only measure a couple of thou big. I
may get + 0.040" rings and file em down to reduce the end gaps I
am getting 0.022"/0.025".
My thoughts are that the ring gaps are like that to make them
safe for todays modern mechanic who opens the box and fits what
is in there.
#Post#: 55113--------------------------------------------------
Re: piston rings
DIR By: espacekiller
Date: March 21, 2013, 7:23 pm
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--- Quote from: divie link ---
>
> Thanks Redwinch. I have put the glaze breaker down the bores
and they dont look to bad and only measure a couple of thou big.
I may get + 0.040" rings and file em down to reduce the end gaps
I am getting 0.022"/0.025".
> My thoughts are that the ring gaps are like that to make them
safe for todays modern mechanic who opens the box and fits what
is in there.
>
--- End Quote ---
Your right, this is the way performance engine builders do it
you can get the gap exactly the size you want.
#Post#: 55149--------------------------------------------------
Re: piston rings
DIR By: NUGGETT
Date: March 22, 2013, 12:49 pm
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I'd try and work out how much an oversize ring is going to close
the gap by, 'cos you really don't want to be filing alot off
rings. If nothing else, its a ball ache unless you have a proper
ring grinder tool and even then it's fairly time consuming.
PS. If you still fancy some filing, i'd get a diamond file.
Knock the handle off it and clamp in a vice then you can file
both sides of the 'gap' whilst holding the ring against the jaws
of the vice rather than the other way around. That should keep
it square ( ish) ;D (it helps to have two bits of soft alli
angle in the vice too, helps to protect the file face and the
ring as you run it along)
#Post#: 55158--------------------------------------------------
Re: piston rings
DIR By: divie
Date: March 22, 2013, 1:54 pm
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If my maths are right the circumfrence of a + 0.040" ring
compared to a + 0.030" is an extra ).035" and i am looking to
close the gap about 0.010" so around 0.025" to file off.
I am willing to try one and file it to suit. I will pick up just
one piston set to play around with and get the rest if it works
out.
This is not going to be a quick engine rebuild !
Does anyone have thoughts on rear crank seals to stop them
leaking? I did mine and it only lasted about a year.
#Post#: 55164--------------------------------------------------
Re: piston rings
DIR By: NUGGETT
Date: March 22, 2013, 2:44 pm
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--- Quote from: divie link ---
>
> If my maths are right the circumfrence of a + 0.040" ring
compared to a + 0.030" is an extra ).035" and i am looking to
close the gap about 0.010" so around 0.025" to file off.
> I am willing to try one and file it to suit. I will pick up
just one piston set to play around with and get the rest if it
works out.
> This is not going to be a quick engine rebuild !
>
> If you've got the time then it'll be a good learning exercise.
8)
>
>
> Does anyone have thoughts on rear crank seals to stop them
leaking? I did mine and it only lasted about a year.
>
>
> First time i did mine I did it by the book and it leaked like
a sieve before i even got it out of the barn; in the
neighbouring barn was a landy servicing/+ firm and I was
advised to fit the flywheel housng first then the seal. It
worked.
>
--- End Quote ---
IMHO
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