Piston rings issues
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Piston rings issues
Engine rebuild in progress. Feeling a little like a fish out of water. I've just inspected all the piston rings, They all look in fine shape apart from the top one on one cylinder, which has about 8-10mm snapped off. Is this amount of imperfection worth worrying about, or do I have no option really but to buy a whole new set of piston rings for all 4 cylinders? Can you buy rings individually? Also, there is 2007 stamped into the top of the piston - does that mean the piston was manufactured in 2007? If I do end up having to buy a new set of rings, there are about half a dozen different sizes for the 1098 engine from ESM, how can I discover which will fit mine? Many thanks in advance.
Russ
Russ
Re: Piston rings issues
Hmm - where did the 8/10mm go ???? Did it snap when you were removing the piston - or cleaning the ring grooves. It's a LOT to consider a full new set - maybe someone will have a spare ring they could give you.
Re: Piston rings issues
no 8 to 10mm missing from a ring is a definite no go , you need at least a set of rings but what are the cylinder bores like , i guess there a ridge at the top indicating bore wear ,
Re: Piston rings issues
The little bit of the ring just fell out as the piston was removed. There doesn't seem to be any scoring or marking of the cylinder, although I must confess I haven't examined it closely as yet - that's a job for next weekend. How do I determine if my piston rings are 'standard'. Is it just a case of measuring the bore diameter?
Re: Piston rings issues
Yes - the pistons may be marked STD - otherwise the absence of any other marking such as 020/030/040 etc. Your '2007' is slightly odd - maybe it indicates a 20 thou oversize........
Re: Piston rings issues
Well, there goes that plan. I was planning on re-using the rings, but then SNAP! . . . . I guess I'll have to get a new set now.
As far as I can tell, they are standard sized rings, insofar as there isn't any markings saying otherwise. The pic below shows the markings on the piston, does anyone in the know have any idea if these tell me a size change from standard?
The bore size according to my 'christmas cracker' calipers is 64.55(ish), so I guess I'm looking at a standard diameter bore. Just need confirmation that I'm not missing something.
Thanks in advance
Russ[frame][/frame]
As far as I can tell, they are standard sized rings, insofar as there isn't any markings saying otherwise. The pic below shows the markings on the piston, does anyone in the know have any idea if these tell me a size change from standard?
The bore size according to my 'christmas cracker' calipers is 64.55(ish), so I guess I'm looking at a standard diameter bore. Just need confirmation that I'm not missing something.
Thanks in advance
Russ[frame][/frame]
Re: Piston rings issues
Standard original pistons - 'Grade' 2 - but that's not significant now. Are the ring grooves and bores worthy of new rings ?
Re: Piston rings issues
The bores look OK to me. Pic below which may tell you otherwise. I wouldn't say there's no lip at the top of the stroke, but I don't think it's significant.[frame][/frame]
Re: Piston rings issues
The ring grooves are something I haven't considered - I'll try and take a pic of them when I get a mo. What is the Alternative to new rings if the grooves aren't up to scratch?
Re: Piston rings issues
New pistons...in which case - may as well get a rebore. But these bores look fine..... Still no offers of a few spare rings?
Re: Piston rings issues
Afraid not. I feel stupid asking this, but if a ring has broken why can't it be reused? Will the area where it has snapped become deformed?
I should add that I don't intend to use a broken ring - I was just curious.
Here's the grooves pic[frame][/frame]
I should add that I don't intend to use a broken ring - I was just curious.
Here's the grooves pic[frame][/frame]
Last edited by swampy42 on Thu Sep 18, 2014 1:13 pm, edited 1 time in total.
Re: Piston rings issues
Grooves look fine. The ring is springy and gently leans on the bore... If snapped in two - obviously no 'spring' - just flapping about... I found some oil rings from a 998 Mini engine (same bore) - but not what you need I guess.
Re: Piston rings issues
Sadly not. I need the top two rings. If it ends up that I have to buy a new set, do I have to do anything to the bore to accept the new set? I seem to remember reading something about a glaze busting tool?
Re: Piston rings issues
You should indeed glaze bust - but rough paper on a stick moved up and down on a 45 degree swirly pattern will do the job perfectly well. I amazed no-one has an old/spare piston /rings for you.....
Re: Piston rings issues
Would emery paper be OK, or is that too rough?
I'll put another post into the wanted section for the rings I think - last one must have been overlooked.
I'll put another post into the wanted section for the rings I think - last one must have been overlooked.
Re: Piston rings issues
Hi
I have a couple of spare rings, STD. diam, 1.6mm or .062" thick. Where are you???
You can have them if they are any use to you, PM me with your address, and I will post to you.
Regards Win
I have a couple of spare rings, STD. diam, 1.6mm or .062" thick. Where are you???
You can have them if they are any use to you, PM me with your address, and I will post to you.
Regards Win
South Yorkshire
Re: Piston rings issues
WIn
PM sent. That's really good of you - many thanks indeed. The rebuild's back on . . .
Cheers
Russ
PM sent. That's really good of you - many thanks indeed. The rebuild's back on . . .
Cheers
Russ
Re: Piston rings issues
There you go! What a great forum!!! Now - do you know how to fit them without snapping them....?