Saturday Night Racer - Oil loss out breather.

Ensign3 LMR Senior Offline My heart says Latemodel, my wallet says Ministock. Posts: 297 Nipomo	Oil loss out breather. 07/14/09 at 10:09am What would cause a big oil loss out breather on a 4 banger. The 33 car had to leave the race after the lights came back on at SMS. Never had a problem losing oil before. He lost about 1 1/2 quarts. Came on all of a sudden about lap 15. Any ideas?
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W1CK3D R4C1NG

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Re: Oil loss out breather.
Reply #1 - 07/14/09 at 10:35am

i was having a simular problume with my old S/S... it was building up so much pressure in the motor that it kept blowing all the oil out thru the breathers... i ended up stuffing rags in the valve cover breathers to get it to stop... but i was told that the pressure was building up becuase the rings were going bad... so i guess i should of rebuilt the bottom end instead of stuffing rags in it... that motor ended up blowing up...lol...

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Dietzsch_Racing25

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Re: Oil loss out breather.
Reply #2 - 07/14/09 at 10:36am

I had problems with lots of oil coming out of the breathers on the valve cover (not a quart and a half though). My problem turned out to be broken top compression rings in a couple of cylinders. The second compression rings and oil control rings were fine.

it never smoked out of the exhaust and ran okay as long as I could keep the oil from getting on the air cleaner.

Hope that helps.

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Ensign3 LMR Senior Offline My heart says Latemodel, my wallet says Ministock. Posts: 297 Nipomo	Re: Oil loss out breather. Reply #3 - 07/14/09 at 10:45am Good suggestions. I'll let Rob know to check thoes rings.
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lwiseracing LMR God Offline what else would i do on sat. night Posts: 614	Re: Oil loss out breather. Reply #4 - 07/14/09 at 1:07pm do a leak down test
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Andrew LMR God Offline 2006 SMS M.S. champion... more of a PB these days Posts: 1359 Camarillo	Re: Oil loss out breather. Reply #5 - 07/14/09 at 3:50pm Definitely lower end.
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ministocker56 LMR God Offline Dirt Late Models Rule! Posts: 1478	Re: Oil loss out breather. Reply #6 - 07/14/09 at 6:38pm i've had it happen before is was a broken ring
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benstrans LMR God Offline I love YaBB 1G - SP1! Posts: 1548	Re: Oil loss out breather. Reply #7 - 07/15/09 at 10:08am Compression leaking into the oil pan. Last time it happened to me it was a hole in a piston. Blew the dipstick out and covered the engine with oil VERY quickly.
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smartguy LMR God Offline Popularity breeds contempt Posts: 2288 North Bay	Re: Oil loss out breather. Reply #8 - 07/18/09 at 3:25am will bad rings cause oil to go out the dip stick tube also in a daily driver?
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Andrew LMR God Offline 2006 SMS M.S. champion... more of a PB these days Posts: 1359 Camarillo	Re: Oil loss out breather. Reply #9 - 07/18/09 at 6:39am Yep
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18racr LMR God Offline We have a Fraud in the White House. Posts: 2848	Re: Oil loss out breather. Reply #10 - 07/19/09 at 8:17am smartguy wrote on 07/18/09 at 3:25am: will bad rings cause oil to go out the dip stick tube also in a daily driver? A bad pcv valve will also cause it on a daily driver
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Andrew LMR God Offline 2006 SMS M.S. champion... more of a PB these days Posts: 1359 Camarillo	Re: Oil loss out breather. Reply #11 - 07/19/09 at 10:47am If there is already substantial blow by already, you're right. It's still related to a worn out lower end.
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smartguy

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Re: Oil loss out breather.
Reply #12 - 07/19/09 at 10:40pm

inline 6 (200 cid) out of a 65 anchero, put a new gasket set on it because it had been leaking oil for a while and had been neglected. put it back in took it for a drive and got back and it had been blowing oil out the dip stick tube. didnt do it before it was reassembled, so i dont know for sure? i was thinking though it was probably cause of compression leaking past the rings into the crankcase?

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imracin68j

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Re: Oil loss out breather.
Reply #13 - 07/24/09 at 10:12am

The only way to know is with a leak down but it is undoubtedly worn out rings. I get alot of oil coming out of mine from time to time. Sometimes you just need to raise the breather up a little. Is smoke pouring out of the breather? I wouldn't worry about it unless your seeing lots of oil on the plugs. If that's the case you need to worry about the oil detinating the engine which can cause breakage.

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smartguy

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Re: Oil loss out breather.
Reply #14 - 08/14/09 at 2:30am

woullda done a compression testt but couldnt find the right adaptor, and as a result couldnt do a leak down test. drove it around anyway, and it hasnt done it since. got to thinkin (which is sometimes dangerous LOL Roll Eyes

) that one of the passage ways to let the crankcase breathe was partially clogged with carbon & i hope thats all it was Huh

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