Welcome to the all new Geo Metro Forum. We hope you enjoy your visit.You're currently viewing our forum as a guest. This means you are limited to certain areas of the board and there are features you can't use and images you can't see. Registration is simple, fast, and completely free. If you're already a member please log in to your account to access all of our features: Join our community! |
| What shall I do about these oversized rings? | |
|---|---|
| Tweet Topic Started: Jul 29 2012, 03:48 PM (1,014 Views) | |
| metro_neel | Jul 29 2012, 03:48 PM Post #1 |
|
Member
![]() ![]() ![]() ![]() ![]()
|
Ok I am rebuilding one of my g10's. Center cylinder had broken piston skirt and another cylinder had a cracked piston as well.....bore's were within spec so the block went to the machine shop for hone/deglaze and hot tanked. Bought a standard size piston and ring kit online. Fast forward about 2 months and Im finally getting around to putting the motor back together....go to check ring end gap....and the rings have to overlap to fit in the cylinder....then i look at the box from the rings...74.00mm pistons and 74.50mm rings......damnit, they sent me the wrong rings. Emailed the company (it was last sunday) and didnt hear anything back by tuesday so i called them, guy said he would contact their supplier and see if they could ship me another set of rings.....he called me a couple hours later saying he contacted the supplier and is waiting for a call back, said he would call me back and let me know......well now its sunday and i haven't herd anything, i have a feeling its going to take a while to get the correct ring set.......getting tired of waiting..... Couple guys gave me the idea I had already been thinking about.....just use them as file fit rings....Which would be ok with me because even though I am within spec on the bore size, Im a little on the high side so this would make sure i get a good sea.....but, usually file fit rings are like 0.005" over sized or so and not 0.50mm but it should be really that big of a deal except for an increased amount of cutting/filing/deburing.....well the thing that bothers me is the oil control ring (the wavy, thicker one)...It can not fit square in the bore because the ends come together and bind.....It cant really be filed down....you would have to cut a link off it.....Then I fear that it will be too loose in the bore and cause oil consumption....I set it in the bore with one link overlaped and it it doesnt look like it would fit too bad really if one link was cut off....Is the oil control ring suppose to fit a little loose? I know the two thinner "rings" of the oil ring have a gap spec, but the control ring doesn't seem to actually have a "spec". Thoughts on what to do? Here are some pics..... ![]() *sigh* ![]() first compression ring..... ![]() the oil ring attempting to fit in the bore..... ![]() cutting one link off could be about right....but worried about it being to much and I really dont feel like building this motor twice....better to just wait on the "correct" rings? If they dont get back to me tomorrow and i call them and dont get anywhere im going to file a dispute on ebay and see about getting some/all of my money back....and just buy some on rock auto....im about to just spend the $42 or so and get some on rock auto and sell these ones and maybe another std set if they ever come through...... |
![]() |
|
| datona paul | Jul 29 2012, 05:13 PM Post #2 |
|
Member
![]() ![]() ![]() ![]() ![]()
|
I wouldn't... the oversize ring will not hold to the cylinder wall... Read: more blowby... (sp) with out a fresh straight bore.. multiplying the problem... I hope this helps...
|
![]() |
|
| Old Man | Jul 29 2012, 05:26 PM Post #3 |
![]()
|
Get the correct rings. If the rings are manufactured right they are put in a fixture for final grinding and the outside diameter is ground to the size of the bore. If you force them into a smaller diameter bore even if you file the ends to the correct clearance they will be under abnormal stress because the outside diameter does not fit the bore correctly. They might eventually wear in or they might break because of the added stress |
![]() |
|
| datona paul | Jul 29 2012, 06:29 PM Post #4 |
|
Member
![]() ![]() ![]() ![]() ![]()
|
Wow.... Does The Bore Look To Have Vertical Scratches?? I'm Not Picking metro_neel... Gathering Info Is All.. Pics Wouldn't Load Earlier.. Slow Wifi... |
![]() |
|
| metro_neel | Jul 29 2012, 09:05 PM Post #5 |
|
Member
![]() ![]() ![]() ![]() ![]()
|
yea I was really leaning towards just waiting for the new rings to come in or buying the correct or whatever....I read about people going the next size up on a motor and using the rings as they were file fit rings which I found interesting. I also wondered about them wearing funny...and yea it does look like there is scratches in the cylinder but it has actually been bored and checked out at the machine shop and even though you can see the scratches, you can not feel them in any way shape or form. And "paul" the rule of thumb I have always been taught is if you can catch your finger nail on it, it needs machine work, if you can't catch your finger nail on the scratch then a de-glazing job should suffice for an every day normal engine rebuild. Just my $0.02 on what I've been told. |
![]() |
|
| datona paul | Jul 29 2012, 11:13 PM Post #6 |
|
Member
![]() ![]() ![]() ![]() ![]()
|
All good metro_neel.. I wasn't being an ass.. using the next oversize rings doesn't allow the ring surface to contact the bore on all sides.. at least. I have friends who have ringed engines with a lot of taper using the next oversize rings.. I'm not that way.. in no way am I saying you are. just information. |
![]() |
|
| metro_neel | Jul 30 2012, 04:02 PM Post #7 |
|
Member
![]() ![]() ![]() ![]() ![]()
|
oh i know you weren't lol just giving you my 2 cents when it comes to visible scratches. You are more likely to get a better fit with file fit rings, but like i said in the original post, file fit rings are usually 0.005" over and they are actually made to be filed to the correct tollorance, unlike these rings.....which I think Im going to file a dispute with this company on ebay and just spend the $39.xx on rockauto and get this damn motor together.....this company has had over a week to get something together now and I have not got confirmation that they are doing anything so screw it....looks like some 0.50mm over rings are going to appear in the classifieds..... |
![]() |
|
| 1 user reading this topic (1 Guest and 0 Anonymous) | |
| « Previous Topic · Engine Tech & Diagnostics · Next Topic » |


Welcome to the all new Geo Metro Forum. We hope you enjoy your visit.


![]](http://z3.ifrm.com/static/1/pip_r.png)








9:41 AM Jul 11