340 motor pumping excess oil on right side

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gardia55

gardia55

1951 studebaker pickup , 340 mopar
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Vancouver ,BC
Hi all looking for some expert advice on my 1969 340 motor pumping excess oil on right side , if I run a breather cap and tube to air cleaner port ( holley 750 dp) on 7576 air gap intake , it sucks the oil and fouls plugs to a no start situation , please note the valve covers do have a baffles at breather ports ,does not burn oil blow blue is strong and runs fine if I just cap it with non breather its fine or a mesh breather it will sometime dribble out as well any thoughts ? appreciated thnx
 
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Is there a baffle under the breather tube on the valve cover
 
I'd check the PCV or just replace it. same goes for the breather, they can plug.
 
I agree with all the above. You need to make sure there is a baffle under the breather and the PCV valve and they should NOT be in the same valve cover.

If you are not sure how a PCV system works or don't understand it, you can google ME Wagner PCV valve and read all their tech articles.

Best PCV valve EVER.
 
missing linc said:
PCV should be connected to the left side
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yes pcv is on the left , I did also connect a mopar type breather to air cleaner and thats when I discovered the oil flow was getting sucked into through the carb ,the valve cover has a small baffle

breathers.JPG


inner valve cover baffle.JPG
 
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fishmens67 said:
I'd check the PCV or just replace it. same goes for the breather, they can plug.
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brand new pcv on the left my issue is with the right if i remove the oil cap I can see the oil coming onto top of the inner baffle thus being sucked in if I run a new breather , also I did install a new melling standard oil pump to see if it would help same results
 
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Just a thought..........is oil being trapped up in the valve cover and not draining back down to the pan?
 
Rocker shaft is on wrong. Also it doesn't matter which side the PCV is on. How would the Crank case know. LOL

One other thing to check is were the push rods changed? Did they use oil through push rods by mistake?
 
Oldmanmopar said:
Rocker shaft is on wrong. Also it doesn't matter which side the PCV is on. How would the Crank case know. LOL

One other thing to check is were the push rods changed? Did they use oil through push rods by mistake?
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Exactly. As long as the PCV is on one side and the breather on the other it doesn't matter.

Can't tell you how many times I've seen them on both sides and the idiot who did it would say it doesn't matter. That same idiot could never explain how the PCV system actually worked.
 
gardia55 said:
can you clarify rocker shaft on wrong ,its only on the right side , not sure about the push rods , thnx
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ok pulled off the valve cover I assume this looks correct , but I am concerned about oil deposits on intake as a result running an open mesh filter with no tube to carb , rings ? only on the right side though ? maybe just change covers with more baffling to restrict the oil from flooding the breather tube to carb base

rocker arms b.JPG


rocker arms.JPG


oil cap.JPG
 
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gardia55 said:
Hi all looking for some expert advice on my 1969 340 motor pumping excess oil on right side , if I run a breather cap and tube to carb ( holley 750 dp) on 7576 air gap intake , it sucks the oil and fouls plugs to a no start situation , please note the valve covers do have a baffles at breather ports ,does not burn oil blow blue is strong and runs fine if I just cap it with non breather its fine or a mesh breather it will sometime dribble out as well any thoughts ? appreciated thnx
Click to expand...
I believe you may have something confused here.
You state that you are running " a breather cap and tube to the carb"
- If you are talking about the the large port on the carb base plate this has full manifold vacuum and should be only connected to the PVC.
- The breather/tube in the opposite valve cover of the PVC should be plumbed to the air cleaner.
 
512Stroker said:
I believe you may have something confused here.
You state that you are running " a breather cap and tube to the carb"
- If you are talking about the the large port on the carb base plate this has full manifold vacuum and should be only connected to the PVC.
- The breather/tube in the opposite valve cover of the PVC should be plumbed to the air cleaner.
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correct the large carb port to pcv my breather tube to air cleaner , but sucked a lot of oil ,Im thinking I may need to switch covers with more baffling
 
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gardia55 said:
correct the large carb port to pcv my breather tube to carb base , but sucked a lot of oil ,Im thinking I may need to switch covers with more baffling
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Ok, now I'm lost. There is one big port on the rear of a Holley or the front of a Carter, so how can you hook the PCV up to the "large carb port" and your breather tube "to carb base"?

Did you go to the ME Wagner web site and read all the tech stuff there?

What I would do it hook the PCV valve up to the large port on the carb and put a breather on the other valve cover and skip any other hoses.

Damn, I'm lost.
 
yellow rose said:
Ok, now I'm lost. There is one big port on the rear of a Holley or the front of a Carter, so how can you hook the PCV up to the "large carb port" and your breather tube "to carb base"?

Did you go to the ME Wagner web site and read all the tech stuff there?

What I would do it hook the PCV valve up to the large port on the carb and put a breather on the other valve cover and skip any other hoses.

Damn, I'm lost.
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yes the pcv is connected to the large port on rear of holley , the breather tube was connected to air cleaner underside but was sucking oil and fouling plugs to no start
 
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gardia55 said:
yes the pcv is connected to the large port on rear of holley , the breather tube was connected to air cleaner underside but was sucking oil and fouling plugs to no start
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Is this a new build?
Or is this an older engine that developed the problem after some miles? If so how many miles?
How much oil is in this engine?
Did you verify that you have the correct dipstick?
Something catywampus here, engines dont just suck oil out of the crankcase without a major problem in the lower end blowing compression into the crankcase.
Sorry for all the question, just trying to figure this out.
 
What did you find out about the pushrods? That is a large amount of oil on the top of the rockers...........
 
rocker arms.JPG
stude rt side fnt.JPG
yellow rose said:
Ok, now I'm lost. There is one big port on the rear of a Holley or the front of a Carter, so how can you hook the PCV up to the "large carb port" and your breather tube "to carb base"?

Did you go to the ME Wagner web site and read all the tech stuff there?

What I would do it hook the PCV valve up to the large port on the carb and put a breather on the other valve cover and skip any other hoses.

Damn, I'm lost.
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yes did that but the oily residue is all over my intake
512Stroker said:
Is this a new build?
Or is this an older engine that developed the problem after some miles? If so how many miles?
How much oil is in this engine?
Did you verify that you have the correct dipstick?
Something catywampus here, engines dont just suck oil out of the crankcase without a major problem in the lower end blowing compression into the crankcase.
Sorry for all the question, just trying to figure this out.
Click to expand...
yes correct dip stick , fresh oil change 10w30 ,its an older motor built about 10,000 miles ,I swapped intake to airgap added 750 holley and discoved the issue , never ran it before bought from a buddy who wrecked his dart ran great then , thus the wrecked car LOL

rocker arms.JPG


stude rt side fnt.JPG


inner valve cover baffle.JPG
 
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gardia55 said:
yes did that but the oily residue is all over my intake

yes correct dip stick , fresh oil change 10w30 ,its an older motor built about 10,000 miles ,I swapped intake to airgap added 750 holley and discoved the issue , never ran it before bought from a buddy who wrecked his dart ran great then , thus the wrecked car LOL

View attachment 1715428978

View attachment 1715429019
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First I love the truck, what year?
Have you run a compression check? If so what were the readings?
yellow rose said:
Ok, now I'm lost. There is one big port on the rear of a Holley or the front of a Carter, so how can you hook the PCV up to the "large carb port" and your breather tube "to carb base"?

Did you go to the ME Wagner web site and read all the tech stuff there?

What I would do it hook the PCV valve up to the large port on the carb and put a breather on the other valve cover and skip any other hoses.

Damn, I'm lost.
Click to expand...
YR do those look like the correct rocker arms for a stock 340? I thought the stock oiling system does not oil thru the push rods?
 
512Stroker said:
First I love the truck, what year?
Have you run a compression check? If so what were the readings?

YR do those look like the correct rocker arms for a stock 340? I thought the stock oiling system does not oil thru the push rods?
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1951 they are the same 1949 to 1956,going to do a leakdown test this week ,getting it ready to sell had it 10 years tons of mods full restoration

inner valve cover baffle.JPG
 
What kind of air cleaner are you running? Got a picture?

You say it only sucks oil when you connect the breather to the air cleaner? Does it blow oil out of the mesh breather if you use it instead?
 
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