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#3011785 - 05/24/13 07:05 AM Oil consumption despite ring job
berniedd Offline


Registered: 03/24/08
Posts: 371
Loc: A Warm place to live in
1998 CRV with 100,000+ on the clock started burning oil 1 quart per 700 miles. I pull the spark plugs and see tops of pistons 1 and 2 wet with oil. #3 and #4 pistons are dry. Also, I don't have a smoke plume from the exhaust pipe after starting the engine after an overnight park nor any smoke when I pull away from a stoplight. Alright, it doesn't look like the valve stem seals, which incidentally were replaced 3 years ago. There are no oil leaks I can see on the engine.

So I had the indie shop change my piston rings with originals from Honda. There was also some wear on the conn rod bearings,so these got changed as well. I myself measured the ring gaps after inserting the new rings squarely into the bores using the pistons to push them in, and they were within spec as per the shop manual. So I assume the bores are not well worn. Cylinder walls were glass smooth. No scratches anywhere. The rings were installed correctly as per the shop manual I had. Shop didn't do a cyl hone, as they thought honing would increase the bores slightly. After the engine was put together with new head gasket and oil pan gasket, she's purring like a kitten. The oil level stayed steady for a few weeks but after 700 miles, the oil consumption has reappeared. Same rate as before - a quart every 700 miles. I changed the PCV with a Honda original but still no dice. Why would the oil be good at the start? If the bores are more worn than I thought, wouldn"t the oil consumption be bad from the start and improve as the rings got seated? Any thoughts on what to look at next?

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#3011790 - 05/24/13 07:09 AM Re: Oil consumption despite ring job [Re: berniedd]
supton Offline


Registered: 11/09/08
Posts: 5081
Loc: NH
Walls were glass smooth--good, but did you still see crosshatch on them? Or where they shiney in some spots with cross hatch in others?

I don't think pushing rings in, and measuring the gap, is the proper way to measure. Actually I've never heard of that method, although it makes some sense... Problem is, I don't think it will register on the low areas of the cylinder wall, where the wear occurs. And it requires tight control over the gap itself. Where did you put the ring gap when you did this? on the major or minor thrust surface? or 90 degrees from that? I'm not sure if it matters, but am curious... Also, did you push the ring down halfway the bore?

How do the plugs look now?

Oh: how long have you run this for, after the re-ring? takes a while for rings to seat.


Edited by supton (05/24/13 07:11 AM)
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#3011793 - 05/24/13 07:17 AM Re: Oil consumption despite ring job [Re: berniedd]
demarpaint Offline


Registered: 07/03/05
Posts: 21557
Loc: NY
It could be a lot of things including a poor job of honing the cylinders, improper installation of the rings, or you're barking up the wrong tree and the valve guides are the problem. Drive it a thousand or so miles and see if consumption tapers off maybe the rings need more time to break in.
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#3011823 - 05/24/13 07:48 AM Re: Oil consumption despite ring job [Re: berniedd]
GreeCguy Offline


Registered: 03/21/05
Posts: 2439
Loc: Elderly County, Florida
I was always told to hone cylinders to "break the glaze," otherwise it would burn oil prodigiously as the rings would not seat. Yes, you are removing metal from your cylinder walls, but this is made up in the honing by the cross hatch pattern which will allow rings to seat and control the oil "slipping" past the rings allowing it to burn in combustion.

As far as measuring the ring gap the way you did, that's the way I was taught.
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#3011825 - 05/24/13 07:49 AM Re: Oil consumption despite ring job [Re: berniedd]
DrDusty86 Offline


Registered: 01/04/11
Posts: 1491
Loc: TX
drive it like you have stolen it to seat the rings.

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#3011836 - 05/24/13 08:00 AM Re: Oil consumption despite ring job [Re: berniedd]
LeakySeals Offline


Registered: 02/18/11
Posts: 5070
Loc: MA
Anything is possible, but rings are generally not the reason for oil consumption on Asian engines. Its usually clogged oil return holes on the piston making the oil control ring non-functional. The piston oil return holes need to be drilled out, removing hardened carbon deposits. Then simply put the old rings back or add new rings. The rings don't really wear unless you have 300k+ Even then, I didn't see anything unusual, crosshatch had little if any streaks on the few honda and toyotas I've been involved in teardown. (we are talking about oil control, not compression which is another discussion.) Worn valve seals are also a common source of oil consumption, Asian all-aluminum engines don't dissipate heat very well, cook rubber seals after a while.
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#3011842 - 05/24/13 08:04 AM Re: Oil consumption despite ring job [Re: berniedd]
supton Offline


Registered: 11/09/08
Posts: 5081
Loc: NH
*slaps head* Ok, I was confusing measuring bore wear with measuring ring gap. Makes perfect sense to measure gap that way. Duh. Sorry for that off-tangent.
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#3011843 - 05/24/13 08:05 AM Re: Oil consumption despite ring job [Re: berniedd]
46Harry Offline


Registered: 01/08/12
Posts: 239
Loc: hawthorne, Ca.
I always push new rings down the bore with the piston to check ring end gap and as far as I know that is the accepted method of checking end gap. Before installing new rings in a used bore, the use of a glaze breaker is critical as installing new rings without deglazing the bores will usually result in the new rings not seating correctly. Cylinders will wear bell shaped from bottom to top so the bores should also be checked for taper and out of round before deciding to install new rings or to rebore the cylinders.

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#3011859 - 05/24/13 08:22 AM Re: Oil consumption despite ring job [Re: berniedd]
Doog Offline


Registered: 10/24/11
Posts: 3502
Loc: Ohio
Originally Posted By: berniedd
Cylinder walls were glass smooth.


No cross hatch visible? That is your problem. I would have measured and honed them.
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#3011873 - 05/24/13 08:34 AM Re: Oil consumption despite ring job [Re: berniedd]
JZiggy Offline


Registered: 10/12/10
Posts: 734
Loc: GA
The 97-8 CRVs also had issues with burnt intake valves from what I have read. Do you know that the head is in good shape?
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#3011891 - 05/24/13 08:49 AM Re: Oil consumption despite ring job [Re: berniedd]
Trav Offline


Registered: 11/20/06
Posts: 10260
Loc: MA, Mittelfranken.de
You did okay with checking the ring end gaps but did you do it at the top, middle and low parts of the bores?

Its a poor mans way of checking bore taper but it works fine. You must break the glaze with a hone so the new rings can seat properly, a flex hone will do it.
The by the book way is measure the piston O.D. and the bore I.D. in 3 places in the bore after busting the glaze then the ring end gaps the way you did it.

As someone posted you might have bad guides or stem seals, did you redo the head?
Did you get enough distance between the ring end gaps on the pistons especially the 3 piece oil control ring?
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#3011916 - 05/24/13 09:09 AM Re: Oil consumption despite ring job [Re: Trav]
Doog Offline


Registered: 10/24/11
Posts: 3502
Loc: Ohio
Originally Posted By: Trav

You must break the glaze with a hone so the new rings can seat properly, a flex hone will do it.
The by the book way is measure the piston O.D. and the bore I.D. in 3 places in the bore after busting the glaze then the ring end gaps the way you did it.


+1 this ^^
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#3011921 - 05/24/13 09:12 AM Re: Oil consumption despite ring job [Re: berniedd]
Quest Offline


Registered: 12/19/04
Posts: 6493
Loc: beaver land EH?
for all re-ring jobs: you must break the glaze with a hone. Glass-smooth means rings aren't seating and sealing properly, and oil will definitely seep past the rings into combustion chamber.

You need to pull the engine apart and redo it.

Q.
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#3011961 - 05/24/13 09:47 AM Re: Oil consumption despite ring job [Re: DrDusty86]
GreeCguy Offline


Registered: 03/21/05
Posts: 2439
Loc: Elderly County, Florida
Originally Posted By: DrDusty86
drive it like you have stolen it to seat the rings.


Definitely worth a shot before tearing the engine apart again. You can do it in a lower gear so as not to risk life and limb and of course, a ticket. Keep an eye on the oil and engine temp so your next post isn't about a blown engine.
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#3011970 - 05/24/13 09:55 AM Re: Oil consumption despite ring job [Re: berniedd]
jrustles Offline


Registered: 02/24/13
Posts: 2035
Loc: Ontario, Canada
+5 or whatever on the braking glaze/glass smooth issue.

There had to have been some crosshatching. It's very rare that I find an engine that has worn out it's iron liners to the point of being totally smooth. I tear down engines with 300+ on the clock and you can still see crosshatching. But even without a rehone it'll be very difficult to get those new rings to properly wear in.
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