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View Full Version : SR20DET oil in cumbustion chamber. . .

D1S13
09-09-2007, 10:20 PM
ok so i am upgrading a few items on my sr before i put the transplant in the 14
when i took off the itm i noticed 1st or 4th intake valve chamber was a heck of alot oilier than any other
i did not clean the others, pics are as i pulled the manifold.
wondering what this being only one chamber indicates. . .
is valve not seating properly? what else can it be. . .

any non smart ass ( you should know....) advice is appreciated. thx
http://i85.photobucket.com/albums/k42/rexnaz/Randompics031.jpg
http://i85.photobucket.com/albums/k42/rexnaz/Randompics040.jpg
http://i85.photobucket.com/albums/k42/rexnaz/Randompics039.jpg
BattleRoyale
09-09-2007, 10:49 PM
valve seal maybe
daryl337
09-10-2007, 07:58 AM
yeah, it looks like you probably have a stem seal problem on that cylinder, how does the manifold look?
TheWolf
09-10-2007, 12:41 PM
try a leak down test in #4.. see if you get air blowing out past the valves...
Codrifter
09-10-2007, 01:03 PM
You may have oil getting passed ur piston rings. you may need to replace the piston rings, you also have excessive blow by gasses,
D1S13
09-10-2007, 06:01 PM
yeah, it looks like you probably have a stem seal problem on that cylinder, how does the manifold look?

the manifold is the same, all clean excelpt same location
D1S13
09-10-2007, 06:12 PM
try a leak down test in #4.. see if you get air blowing out past the valves...

i will be removing the head soon and just replacing the valve seals when i do.

just hoping its not the rings also
opponheimer
09-10-2007, 09:59 PM
hmm i would replace more than valve seals on that one cylinder.. unless there is anything noticeably wrong with the 4th cylinder valve seals i would do the rings too..
D1S13
09-10-2007, 10:13 PM
hmm i would replace more than valve seals on that one cylinder.. unless there is anything noticeably wrong with the 4th cylinder valve seals i would do the rings too..

yeah, i will have to wait till i pull the head, just wishful thinking hoping its not the piston also. . . :squint:
fliprayzin240sx
09-11-2007, 12:28 AM
Leak down and compression check before you pull the head.
spdfreek0o
09-11-2007, 10:42 AM
cold compression test won't yield the best results, especially since the motor is pretty much torn down.
steve shadows
09-11-2007, 10:46 AM
could have just been some left over oil from when it was shipped in the container laying on its side or something.


cold compression tests are a reality check btw.

hot is for people in denial
daryl337
09-11-2007, 12:12 PM
**edit** just realized that both valves are dirty, what is the exhaust side looking like? a ring failure would normally reflect on multiple valves as well, perform the leak down and let us know what you come up with.
D1S13
09-11-2007, 03:55 PM
**edit** just realized that both valves are dirty, what is the exhaust side looking like? a ring failure would normally reflect on multiple valves as well, perform the leak down and let us know what you come up with.

will do, also just spoke to the shop i purchased the motor from (which you can't trust shops to the fullest), but they say the motor had 40k and was both leak downed and compression tested and everything was well, but thats their job to sell motors:axe: :ughug:
opponheimer
09-12-2007, 06:44 AM
could have just been some left over oil from when it was shipped in the container laying on its side or something.


cold compression tests are a reality check btw.

hot is for people in denial

and cold compression checks can also show nothing even when the engine does burn oil.. oil rings are independent of compression rings.. (although compression rings are made to scrape most of the oil)


In other words, i had an sr once that smoked bad and comp tested perfect. it had a cracked oil ring
daryl337
09-12-2007, 08:32 AM
we all know the oil rings are undersized in comparison to the compression rings, I too have had a smoking problem with an old SR and the compression checked out fine, I pulled it apart and found that the oil rings had **not cracked**, but had lost a considerable amount of tension in comparison to the new ones I had in stock. Replaced them and the problem was fixed.


However, without knowing whether or not the head is in good condition, and whether the oil residual is reflected on the exhaust side, I won't be able to make a guesstimate as to whether it is a ring or not.

it COULD be left over oil like steve said, it could be an internal failure, or it could be as easy as a couple of shitty stem seals.