A little history, I bought my 31 coupe project about six years ago. It was a basket case of sorts. The engine a 67 327 small block was on an engine stand. Which it had been for at 5 to 8 years before my purchase. The sell told me the engine had a rist pin noise upon start up. Well I did break into the engine and found that it had hardly been run since it had been rebuilt. I also discovered the source of the "rist pin noise". The crank had been ground to 10 under on the mains and 20 under on the rod journals. But all of the bearing were 10 unders. LOL I put the proper bearings in and moved on. I've never run the engine much until resently with getting the car lisensed and on the road.

Here's my problem I have about 60+ psi on the oil pressure. My oil pan gasket front seal first and since I fixed that with a larger aftermarket seal for the aftermarket timing chain cover now the rear seal leaks. I jumped onto the freeway for the first time and when I got home notices that oil had blown out of the oil filler tube, which comes out of the front of the intake. The oil filler tube is the only crankcase ventelation that I know of. Nothing in the valve covers.

I'm thinking I have one of two problems. First because the=is engine set for so long and I didn't replace the rings that maybe blowing pressure by the rings and causing my problem. Or second I don't have this thing properly vented.

Any suggestions on determining what my problem is? And if it is the rings might it correct itself as I run it?

It is normal for a little oil vapor to come out of the tube being that you don`t have a PCV valve. If you are getting alot of oil out of it, I suspect ring seal.
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The "New" and Unimproved edcroozer... Charter D.S.R.A. member

I would think that if the "builder" put the wrong bearings in it, I would have had to replace the rings also. I'm an old Grant cast iron ring type ever since I fought a smoking 327 that had the Duntov 30-30 cam and found out much later that the factory put chrome rings in it and they never "set" allowing oil into the cylinder. It ran like stink (12.20 @ 105)in the quarter for a street car. I did have a PCV valve in it with aftermarket covers but before that, I also had a lot of oil leaking in various places especially out of the filler. The rear gears were 4:11 so RPM was up there a bit...After I sold the Vette, I ended up with my Dads '63 Impala that was a real leaker from too many miles and no TLC. I rebuilt the 283 and used the right bearings and used the Grant rings and it never leaked a drop after that. Been using them ever since. I think "Moly"coated rings are for big dollar race motors!!
About all I can think of is that you have bad rings that are allowing to much blow by and there's not any real place for it to go except to blow past a seal or out the filler.
FredP
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Fred P.

Is the vent tube in place behind the intake manifold on the block? If someone blocked this off with a plug, your engine won't breathe correctly and it will spit oil out the breather in front.
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Lynn
'32 3W

I don't remember a vent tube in the back. Something to check.

Thought all 327's with a stock intake had the filler at the front?? If I'm mistaken, Denise can use a few of her "wet noodles" on my bare backside!!!
" Oh please! don't stop..it feels so good! But no chinese noodles plz..FredP
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Fred P.

Fred Fred Fred...what in the world are we gonna do with ya partner!? Your in rare form today!
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DSRA Earlybird Member / Co-Founder..
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If it dont fit, shoe-horn it!

Grant, ya can,t accuse me of trying to do standup!
Fred(lol)P
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Fred P.

Ok so they may have mad an exeption or two! LOL
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DSRA Earlybird Member / Co-Founder..
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If it dont fit, shoe-horn it!

That would be MADE! Talk about wheres my brain! LOL
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DSRA Earlybird Member / Co-Founder..
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If it dont fit, shoe-horn it!

It's not a stock manifold, but what's your point Fred! I'm just looking for advice to see if maybe I don't have enough ventilation to the crank case. It very well could be the rings and if so I'll just drive it for awhile and see if it cures itself! Hey Fred! ;)

Check the block over from the distributor on the driver's side. The older blocks had a hole in the block slightly smaller than a distributor hole in the manifold. There was a pipe attached that would vent gases from the crankcase. If this has been sealed off with a softplug or something, this could be your problem. These engines had to have a place to take in air and let air out. Someone may have plugged this thinking they were going to add a pcv valve in a valve cover but didn't finish the job. This could be the cause of your problem.
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Lynn
'32 3W

Lynn, we're showing our age.....

Charlie
37 Chevt Rag top

Also known as the blow-by tube!! If it is blocked and no pcv valve it will blow oil out the filler tube!!
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Mike,Charter DRSA Member

also known as a 'road draft tube'.
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phil


It's not a NOMAD, it's a Yeoman!
Not an engineer, but I DO drive a train.

Tsk, Tsk, Tsk!!
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Lynn
'32 3W

On the "old" small blocks, they had the oil filler tube in the intake and the crankcase vent tube in the rear of the engine, behind the intake, This was a metal tube that ran from the top rear of the block to the underside of the engine on the passenger side. It used to mess the starters up with oil and road crud.

I would do a pressure leak down test on the engine to see if it is the rings, see if you can borrow a guage. I borrow a friends and check mine every spring just to see what type of shape I'm in for the season.

Since piston ring seating/sealing was brought up, last Saturday at the local cruise night we were all taking about peculiar things we had heard, and someone brings up this story about someone getting an engine built and it doesn't seem to running as strong as he expected so he goes back to the engine builder and asked him what he thinks. The engine builder asks him how much has he been driving the car and then proceeds to removes the air cleaner and pour baby powder into the engine through the carb, I guess it was suppose to help seat the rings and it worked or so the story goes.

I never heard of this before, and I really coundn't stop laughing but I guess it could work, if it didn't plug anything up in the carb, like the air bleeds. I wouldn't try it, but was wondering if anyone has heard of this before?

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Be different but be yourself.

I have heard of guys using "Bon Ami" cleaner for the same purpose. Never tried it either! Sounds like a crude repair, but I guess if it works, what the heck!
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"We don't build 'em like they used to"
Rick
www.loboys.com

I use to work at a Chrysler dealer in 77 and the slant six engines sometimes didn't seat the rings. A little Comet cleanser mixed with water and poured down the carb at a high idle work! No kidin' Dave
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Life's too short to drive an ughly car!
Massachusetts Safety Inspecter for KKOA
www.geocities.com/stupidbaker57/custom_green

My dad used Bon-Ami on a Studibaker Lark he rebuilt. By advice, if I remember right it created all hell. Bon-Ami and comet are a simular product.

Good news I guess, I do have the vent hole in the back of the block which is blocked off with a soft plug. I really don't want to recreatethe blowby tube, so would breather in the valve covers be the solution and is a pvc valve part of that solution? I have a set of MT aluminum valve covers with knock outs.

I'll still do a compression test, but I think the venting is the problem.

Carl, Go the PCV route. When you create a negetive pressure (vacuume) in the crankcase, You eliminate the oil vapor out of the breather given the rings are healthy.
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The "New" and Unimproved edcroozer... Charter D.S.R.A. member

Thanks Ed.

Just hope it was of some help.
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The "New" and Unimproved edcroozer... Charter D.S.R.A. member

That's funny I never ment to repost that photo. I see it default again. Help, if that does the fix I'll be happy as a clam.

BTW...Nice looking ride.
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The "New" and Unimproved edcroozer... Charter D.S.R.A. member