gardia55
1951 studebaker pickup , 340 mopar
old school 56 caddy air cleaner and yes lightly blows out the mesh and covers intake in residue see the pic
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340 motor pumping excess oil on right side
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View attachment 1715429041
Phreakish
Well-Known Member
Light oil doesn't seem enough to be plug fouling. Is it sucking more when connected to air cleaner?
I'd try a different air cleaner if you have one. Or at least a new air filter first. I've seen some cars suck oil if the breather goes to the inside of the filtered area and the filter is old or has been wet or is plugged or is just a cheap element.
I'd try a different air cleaner if you have one. Or at least a new air filter first. I've seen some cars suck oil if the breather goes to the inside of the filtered area and the filter is old or has been wet or is plugged or is just a cheap element.
yellow rose
Overnight Sensation
Don't hook the other valve cover up to the air cleaner.
Just put a breather on the other valve cover.
Just put a breather on the other valve cover.
gardia55
1951 studebaker pickup , 340 mopar
its brand new just installed it the problem is not the vacuum ( sucking) its pumping too much oil inside rt cover ,thinking of extending the baffle to se if it helps ? thnx
gardia55
1951 studebaker pickup , 340 mopar
agree tried that still drips out of the breather , going to extend inner cover baffle to see if it helps ,thnx
Phreakish
Well-Known Member
If there's too much oil, it's not a baffle issue. It would do it at both sides because those valve covers are the same, no?
I'd try starting it without the valve covers and be ready for a mess... See if one side is definitely getting more than the other.
Have you checked the rocker shaft hold down bolts? One bolt goes into the oil feed for the shaft. If loose, I'm sure it could move oil places it usually wouldn't go. Longshot, but hey..
Don't overtighten them though. If they're past snug, they're not the issue.
I'd try starting it without the valve covers and be ready for a mess... See if one side is definitely getting more than the other.
Have you checked the rocker shaft hold down bolts? One bolt goes into the oil feed for the shaft. If loose, I'm sure it could move oil places it usually wouldn't go. Longshot, but hey..
Don't overtighten them though. If they're past snug, they're not the issue.
yellow rose
Overnight Sensation
Hold on. You can only make the baffle "so" big. You either have a **** PCV valve, or you have junk ring seal.
Neither of which a baffle will fix.
Did you go to the ME Wagner web site and read that tech stuff? If not, STOP and go read it. It's free.
You may need to spend some money and buy a real PCV valve. That junk you buy at the parts store is junk.
The OEM's spent big $$$$$$$ to design and engineer the PCV valve for specific applications. It's wasn't a one size fits all like it is now.
The fact is the aftermarket has killed as many part numbers as possible and then uses a generic, one size fits as many engines as possible.
So before you re-engineer something that doesn't need it, do some study.
gardia55
1951 studebaker pickup , 340 mopar
yes I have checked both sides the left is fine ,checked the shafts thoroughly look fine , the push rods m not sure if they are flow through didnt check them yet ,and I will crank it and see where the excess is coming from ,
yellow rose
Overnight Sensation
You are making the assumption there is too much oil there. How do you know that? You're guessing.
There is no way there is "too much" oil in the rocker box.
Again, it's either a ring seal issue or your PCV valve isn't up to the job.
yellow rose
Overnight Sensation
That's what I'm asking...how do you know there is "too much" oil on that side?
It's frustrating trying to understand what your looking at that makes you think it's an excess oil issue to one side only?
Want to test that? It's easy. Put the PCV valve in the other cover and out the breather on the side it's not on now and see what happens?
I say it will be the same thing, different side.
But I could be wrong too.
gardia55
1951 studebaker pickup , 340 mopar
when I remove the breather i see oil flowing over the baffle it also drips out of the breather so not like high oil levels but definetly high volume only 4 quarts in the motor reads fine on the dip stick
gardia55
1951 studebaker pickup , 340 mopar
when I put the pcv in the right side it instantly soaks the plugs in oil and wont start
gardia55
1951 studebaker pickup , 340 mopar
i agree the warner pcv is a good mod to make either way
yellow rose
Overnight Sensation
Are both valve covers baffled like the one pictured in post 6? If so, that's a pretty efficient baffle.
I'm just spit balling here...if you have an old valve cover you can cut the top away (I used to have a couple of those laying around but I 86'd them a few years ago or I'd just send you one) and then bolt it on and actually look at how much oil is up there and where it's coming from.
I'm at a loss to think of a way to explain how there is excess oil getting to one side only. Unless you have a rocker shaft with a split in it or something (that's another spit ball right there) or the rocker stand where the oil is fed to the shaft is fractured or something oddball like that.
The Chrysler oiling system for the rockers is self limiting for the most part and I'm at a loss to think of what's going on on that side.
The other option is just pull the distributor and drive gear and put your priming tool back in there and spin the pump up and see what you get.
Don't forget you need to turn the crank over until you get the oil holes lined up.
And of course, I can't remember exactly where the crank has to be to get oil up to that side but someone here will remember.
That's about all I got. For now. I'm sure I'll wake up at about 3 AM with some other corn ball ideas.
AJ/FormS
68 Formua-S fastback clone 367/A833/GVod/3.55s
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You know that as rpm and load goes up that the factory PCV cannot keep up getting rid of blowby, and so the excess has to go out the breather backwards and up to the aircleaner,..... right?.......and this is normal. If it didn't work this way, the engine would blow out the weakest links,usually the dipstick, the grommets, the distributor seals,or the valvecovers.
Blowby can be measured on a running engine, as can crankcase pressure.
You can redirect the breather outlet, down to within 8 or so inches of the road and make something that works like what was once called, a road-draft tube. On mine I just looped the hose up and over then down onto the exposed portion of the shock stud. The breathing still happens but the oil runs back into the VC, It's been that way for more than 10 years, maybe 15;badaboom.
It seems curious to me tho, that this seems to have started after the intake swap.
Blowby can be measured on a running engine, as can crankcase pressure.
You can redirect the breather outlet, down to within 8 or so inches of the road and make something that works like what was once called, a road-draft tube. On mine I just looped the hose up and over then down onto the exposed portion of the shock stud. The breathing still happens but the oil runs back into the VC, It's been that way for more than 10 years, maybe 15;badaboom.
It seems curious to me tho, that this seems to have started after the intake swap.
gardia55
1951 studebaker pickup , 340 mopar
yes im wondering if the airgap 7576 is overkill with the 750 dp holley , or perhaps not enough pcv vacuum to keep blowby under control ,I will try the turn down tube for now , thnx
yellow rose
Overnight Sensation
You should be ok with the stuff you have. I don't believe in overkill...but that's just me.
Ok going to ask a question and I don't want you to take it as offensive, because that's not the way it is. Here goes...
I know this dumbass, and he was fighting PCV issues. He wasn't having all the issues you are, but he was going nuts trying to sort it out.
Turns out the guy had a spider, or some other creature like a wasp or something had built a large family dwelling in the hose from the carb to the PCV valve. Once he blew that out of the hose it was game on and everything went back to normal.
The moral of the story is verify the line from the back of the carb to the PCV is fully open.
I also seen some Holley base plates that get crap and whatnot built up in the groove that feed vacuum to the port. That will definitely put you in a world of poo.
Wanna make any guesses who the dumbass was??
gardia55
1951 studebaker pickup , 340 mopar
removed valve cover turned over no sign of pumping oil ,also has strong compression 150 across , thinking it has to be a vacuum leak with the intake manifold install
AJ/FormS
68 Formua-S fastback clone 367/A833/GVod/3.55s
- Joined
- Jan 19, 2014
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- 24,952
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See, but ,you said it was not smoking blue; I assume you meant out the tailpipes. which if you had a valley leak, it would be pouring smoke.
But there is an easy test for this. Just pop the PCV out of the grommet,flip it out of the way, then plug the hole. Make sure the dipstick is seated. Remove the breather and put your hand, or thumb if it's big enough, over the hole in the VC, to seal it. Rev the engine up to about 1200 to 1500.
Wait a few seconds and if the valley is leaking, it will suck your hand onto the breather hole.
On the other hand if you have pressure there at 1200 to 1500, depending on the severity, you could be having a mechanical problem; new test required.
Another thing you can do is put a vacuum gauge on the dipstick tube, and plug both breather holes; but if you have pressure there, do not let it rise above 4psi, or it might blow a seal out, and it would really suck if the rear cam plug popped out......... better make it 3psi max, cuz I didn't install that plug.
As for the 750DP and AirGap, I run that on my 360/4-speed, and it is definitely not too big. I can idle that sucker down to 550 rpm @5* advance,with a [email protected] cam, and she will pull herself around the flat,hard level, parking lot at 4 mph (3.09x3.55=10.97 starter gear). And she'll power away with no hiccups.
Edit; sorry; may not be a fair comparison, as I have about 180psi cranking cylinder pressure.
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MiradaMegaCab
Well-Known Member
Are you missing any “shop rags”? Lol
Not being a smart *** but it’s been done before....
That wouldn’t let the oil drain back down to the pan efficiently.....
yellow rose
Overnight Sensation
That very same thing destroyed an engine I built. To many guys working on something none of them had any reason to be anywhere near a race car with the hood off.
gardia55
1951 studebaker pickup , 340 mopar
ouch thats ugly
gardia55
1951 studebaker pickup , 340 mopar
if I connect the breather tube to air cleaner it sucks the oil instantly fouling the plugs to no start if it did start it would definetly be very blue
Have you checked the rocker arm shaft for a crack. There has to be something not right in the valvetrain.
Quit guessing, it's time to pull the rocker shaft apart and inspect it.
Nothing here makes any sense if assembled correct and the parts are serviceable
Quit guessing, it's time to pull the rocker shaft apart and inspect it.
Nothing here makes any sense if assembled correct and the parts are serviceable
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