is there any way to test an oil pump before it's installed? and if there is can someone describe the process?
CookieBoy,
You need to spin the shaft while supplying the pump with oil. Where the oil comes out you need to put a pressure gauge. When the pump reaches it's maximum pressure it will begin to bypass internally. This is done with a relief circuit built into the pump consisting of a ball and spring. The more compressed the spring is against the ball the higher the pressure will go before bypassing. And the same in reverse order. I would expect a new oil pump should be putting out about 80 psi.
High_Horse
#226
OK... I guess with the proper knowledge and tools it can be done... have been told it's not possible.
Next question... has anybody done this themselves? and is it a reliable test if you do this yourself?
CookieBoy,
It is possible. Yes,Yes. Are you still having oil pressure problems with that new pump? Or are you trying to get a handle on that other pump that was over-pressuring? Talk to me.
High_Horse
#226
no problems w/the new oil pump... all is good.
I dealing with the ebay seller trying to get the manufacture to pay the bill for the extra labor that was involved due to the failure. I guess they do that sometimes. Not much chance I suppose, already getting told a million excuses about how it must have been the mechanics fault. While I'll admit that anything is possible... well anyway you get the idea...
He was also telling me it's not a Melling pump they sent me as Melling discontinued these pumps "so many years ago" and they substituted a different brand... :wow: The seller then told me the brand I got was a "Prasa" so I dug the pump the mechanic returned to me out of the box and the only name I found on it was "Burman." ::)
anyway... just spinning my wheels getting no place fast is all
well ive did it tonight on an allis chalmers WD tractor but havent tried to on a ford car motor (lots diffrent ) i know one way to do it on a v8 (and possibly a 4cyl) is to pull the dist find out what size the shaft is grab a socket and mount it to a drill (NOTE DUCT TAPE THIS ALL TOGETHER SO IT DONT END UP IN THE BOTTOM END) then spin the drill and have some one watch the guage.
that will tell you also, and would is the way i do it
CookieBoy,
I feel your pain but don't throw that pump away. If it was ballooning your filter then it makes pressure fine it's just not relieving. Just hang on to it and when we know we are going to cross paths bring it with you.
High_Horse
#226
Tude... that sounds like it might work...
HighHorse... I will be sending the pump back... I will be getting a refund on the pump at the very least and seller plans on sending the pump back to the manufacture for testing to determine if they will pay the bill. One of the guys at the auto parts store next door said I have about a 10% chance the manufacture will cover the cost and in cases like this they (all manufactures) usually find a reason to blame the installer.
well after the seller has had the pump for 2 months I sent an email to see what was up and this is the response so far...
"Brian: When the pump arrived, our own engineer purge it and checked it . The pump seemed in good working condition. Other than minor scratches, it worked correctly. However, we did send it to PRASA.
Prasa finished its diagnostic 2 weeks ago. All in all the diagnostic report is resumed in one sentece: The oil pump is reported as working. It has "minor scratches" due to the installation process but it is working. We requested the oil pump back and decided to get another engineer analysis (third party) to check it and diagnose. Once done, they will determine if the pump is in working condition. I will give you a call once that is done. It should be ready before the end of the week."
I still would like to know who PRASA is... I'm thinking they are a rebuilder and not a manufacture. The pump that was bad looks exactly like the origional OEM oil pump that was removed from my origional block right down to part #'s and markings.
Anyone ever heard of PRASA? seller claims they are the manufacture..
Maybe they are PRASA you do not sue them for the engine repair bill??
I purchased a melling pump on Ebay for the rebuild and turns out they substituted a different brand aka prasa. Only reason I found out was because it failed. I'm assuming prasa is a brand name or supplier, they get shipped in from ?mexico? I recall him saying. Anyhow when I still thought it was a melling, the guys at the auto parts store told me to contact melling to return the pump and get reinbursed for the labor to reinstall a new one. I didn't even know that was possible. I got a phone number and talked to a tech, we talked for some time and he agreed the pump was bad. Then I find out it's a Prasa... And on the story goes and almost 3 months later I am just curious if I will get paid back for the extra labor that was involved. I did get billed for it and paid it. not a big deal as we all know stuff happens. I'll never see a dime, well maybe the origional price of the pump.
does this sound right on a 73 ford 2.0...
I say... "The pump does work, to well in fact, and it was producing to much oil pressure and expanding the oil filters. When I still thought it was a melling pump I purchased and received I called melling support and described the problem. the response from the melling tech was something like this... "there is a valve stuck in the pump and it's pushing out 100+ psi, it makes pressure fine it's just not relieving the extra because of the stuck valve and is defective, replacement is required." At that point the melling tech wanted to start the process to cover replacement cost of the pump and labor to fix the problem. It is a known situation that sometimes happens and sounded like a pretty straight forward procedure... until I told him I bought it on Ebay. Later I found out it wasn't a melling I received and I didn't talk to melling tech support again.
and the response was...
Based on your description, two different workshops gave me a diagnosis of the problem.
Both agreed that :
+The check valve for the 2.0 engine is based right next to the oil filter base, not inside the pump. This regulates the flow of oil into the oil filter and to the rest of the engine.
+Any liquid is incompressible, that means that any applied pressure the liquid will find a way out of the engine. That is the reason the check valve is located near the oil filter. If the valve fails, the only thing that gets damage should is the oil filter.
+To replace the oil pump other sections and components need to be removed in order to remove the oil pan and then the oil pump.
Two things could have happened:
a) The check valve was clogged.
b) The oil veins near the oil filter were clogged (Usually with silicone or other gasket material).