What he said ^^^^^^^
No oil to sendint unit when priming mystery
- Thread starter mbaird
- Start date
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Another thing to consider is, when oil gets to the shafts, there is a huge pressure drop because of the big volume of the insides of the shafts, so it will take a little while to fill the shafts even with the camshaft gallys aligned with the holes in the camshaft bearings.
MacDogma
Member
I doubt this is your issue, but...
The first 340 that I built (40 years ago) did not make oil pressure after assembly. It ended up that the block I bought had oversized lifter bores from the factory. At that time you could buy oversized hydraulic lifters directly from Mopar. Of course, the guy I bought the block from likely knew about the issue. I later found out that the block was stamped with some marking indicating that it had that issue. I don't remember what the marking was, a diamond shape maybe.
The first 340 that I built (40 years ago) did not make oil pressure after assembly. It ended up that the block I bought had oversized lifter bores from the factory. At that time you could buy oversized hydraulic lifters directly from Mopar. Of course, the guy I bought the block from likely knew about the issue. I later found out that the block was stamped with some marking indicating that it had that issue. I don't remember what the marking was, a diamond shape maybe.
No shafts ….these are EQ Magnum heads .
I didn’t think about the lifters draining back . I would think the check valve would prevent them from draining. But it does make sense that they would not have to face the feed holes .
PRH
Well-Known Member
I’d put a mechanical gauge on it to verify you’re building good pressure.
Then if you’re still not getting oil to the rockers, pull a rocker and pushrod and see if there’s oil coming up through the lifter.
Then if you’re still not getting oil to the rockers, pull a rocker and pushrod and see if there’s oil coming up through the lifter.
Well I definitely installed the lifters 180* off . So much for trying to be smart …. Will pull the intake and rotate them 180. Then install my pressure gauge and retry .
Learn something new every day !
Learn something new every day !
mopowers
Well-Known Member
And some lifter have the holes on the front/rear sides. Go firgure...
Pull the filter and put a pan down there. It should take between zero and 1 second to prime the pump and have oil out of the filter mount. Pulling the filter removes head restriction from the pump
Is the pump new? dry? You can also try overfilling the pan temporarily.
How about the pan to pump fit? There are issues with pumps being damaged/ crack the casting at the mount due to pan interference.
Try loosening the filter to see if it will pump the air out when you prime it. I've run into that a time or three.
....and you are 100% SURE the galley plug next to the intermediate shaft is installed? 100%. Not 99.9%. Remember, there are TWO plugs in line with each other there. The one inside the block and the one in the bellhousing area. A lot of people assume the one in the bellhousing area is it. It's not. Leaving that inner plug out will result in zero oil pressure at idle or with the drill trying to prime. If you pull the intake, I'd sure as HECK double check that.
Did you screw with the oil pump pressure relief spring and valve?
A couple of questions. Do you have oil through pushrods? Is this an LA short block?
Ok… pulled the intake , pan and oil pump . Filled pump with oil . Installed pressure gauge , filled pan back up . Now I have oil !
40 lbs but the gauge was pouring out oil from the braided line fitting . Will worry about that later .
Never had a pump cavitate before even when installing a new one .
Live and learn ….
Now I am thinking about ordering a Kevko M302 6 qt pan and pick up . My Melling HV pump can really move some oil !
That extra quart might come in handy while going 85-90 across Idaho . And still getting passed ..urgh…
I have one on the 408 in the Swinger and am happy with the quality . Love the baffles and scraper .
40 lbs but the gauge was pouring out oil from the braided line fitting . Will worry about that later .
Never had a pump cavitate before even when installing a new one .
Live and learn ….
Now I am thinking about ordering a Kevko M302 6 qt pan and pick up . My Melling HV pump can really move some oil !
That extra quart might come in handy while going 85-90 across Idaho . And still getting passed ..urgh…
I have one on the 408 in the Swinger and am happy with the quality . Love the baffles and scraper .
I think it would have eventually picked up on startup, but aho on Earth wants to take that chance? Glad you got it. What braided line fitting?
I ran that drill for over 1 minute and still no oil. Hope I didn’t hurt the pump ? I spent some time blueprinting it for the stock stroke engine .
I'm sure it's fine. They're a lot tougher than that.
It would have been one hell of a lot easier to just overfill the pan than to tear it all down. ARE YOU SURE there is no air leak at the pump mount, AKA damage from the pan hitting the pump
True…
I never saw you answer what the braided line was. If you left it open and it is part of the oil system, that might be why it was sucking air and not oil.
The gauge I was using came with braided hose and an fittings vs tubing . The gauge fitting was leaking .
abodyjoe
Well-Known Member
you have to spin the engine slowly. its super easy to go right past the holes that supply the rockers.
This is a magnum based engine.
No holes to line up . Rockers are fed thru the pushrods .
Gotchya. I wouldn't think a small leak could affect it, but any leak is a bad thing when trying to prime, because the pump will pump the easiest thing first and we all know that's air. lol Glad you got it sorted out, though.
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