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10-06-2015, 08:11 PM | #21 |
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Join Date: May 2010
Posts: 468
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Re: Oil pressure on start-up
A known good (Stewart Warner) mechanical gauge fitted directly to the engine and a good ,fully charged Optima 6 volt battery will spin it like crazy and you should see oil pressure within 20 to 30 seconds. Pull the plugs to allow faster rotation. Otherwise something has gone wrong.
My opinion |
10-06-2015, 08:23 PM | #22 |
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Join Date: May 2010
Location: Florida and Penna.
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Re: Oil pressure on start-up
You can NOT tell if the oil pump is good by putting the pickup screen in oil and
turning the pump by hand. Even a bad pump will put out a big stream of oil. As soon as you block the output slightly like the restrictions from bearings etc a bad pump will stop flowing. This could be from worn gears, end play in the ends of gears to bottom cover or the bypass valve on the pump. I described on this forum 4 or 5 times how to build a simple plastic sleave and run the pump with a 1/2" drill. This way you can shim the spring to get whatever preesure you want. These pumps early and later style will all put out close to 100 lbs. Look up in past posts how to build the test unit. G.M.
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www.fordcollector.com Last edited by G.M.; 10-06-2015 at 08:32 PM. |
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10-06-2015, 10:53 PM | #23 |
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Join Date: Dec 2013
Location: Minnesota, Florida Keys
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Re: Oil pressure on start-up
G.M.
Thanks for posting this. I have searched the site (including the archives), but can't find what you are referring to. I think I see how it works, but I have a question. Is the hose coming out of the fitting behind the gauge to direct the oil from the pump back to container in which the pump is run? Does it have a restriction in it to simulate the resistance of the bearings, etc. If it is, I think I understand it. Tubman |
10-07-2015, 12:33 AM | #24 |
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Location: Sweden
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Re: Oil pressure on start-up
You need an adjustable valve on the return hose.
What you want to see is that the pump can put out X amount of gallons/minute at your desired pressure. |
10-07-2015, 05:44 AM | #25 |
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Location: Minnesota, Florida Keys
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Re: Oil pressure on start-up
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10-07-2015, 07:05 AM | #26 |
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Re: Oil pressure on start-up
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If i dig i should have a spec from Melling somewhere...but its probably lost in the book keeping |
10-07-2015, 08:05 AM | #27 | |
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Location: Florida and Penna.
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Re: Oil pressure on start-up
Quote:
the OD's of the pump and pushed on the pump. This confines the output of oil in the sleeve. A fitting is drilled and tapped into the sleeve but can not extend inside or the sleeve won't push on. A "T" with gauge and a flexible plastic hose for returning the oil into the oil supply for the pump pickup. The hose is bent to slow or stop the return flow. When almost closed you will see close to 100 lbs. The bypass valve on the pump is adjusted pressure you to what want at 40 MPH. Older pumps do not have the bypass valve, the pressure is adjusted by the valve in the front of the valve valley. The pump gear is removed and the pump is powered by a 1/2" drill. The CW rotation of the drill is the way the pump runs. Even bad pumps will pump a good supply just by turning the pump a few turns by hand but as soon as you bend the tube there is no pressure and the oil just slips in the pump. G.M.
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www.fordcollector.com Last edited by G.M.; 10-07-2015 at 08:15 AM. |
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10-07-2015, 08:45 AM | #28 |
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Join Date: Jan 2011
Location: Central Ohio
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Re: Oil pressure on start-up
Just so everybody is thinking the same . . . 2000 RPM at the pump is 4000 engine RPM - it runs at 1/2 speed (via the cam).
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10-07-2015, 09:06 AM | #29 |
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Location: Sweden
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Re: Oil pressure on start-up
That was engine rpm something like cruise speed.
Heres some specs on melling pumps. M-19 (Std vol. Pump) Idle 16 psi.- flow 2.12 gpm. Cruse 52 psi. (no flow info.) M-15 ( HV Vol. Pump) Idle 23 Psi.- flow 2.25 gpm. Cruse 56psi. (no flow info) |
10-08-2015, 08:04 AM | #30 |
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Location: Central Ohio
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Re: Oil pressure on start-up
I wonder what weight oil and if up to temperature? Probably straight 30 weight and the engine warm.
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04-30-2016, 05:19 PM | #31 |
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Join Date: Dec 2013
Location: Minnesota, Florida Keys
Posts: 10,319
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Re: Oil pressure on start-up
An old thread I know, but I'm back in Minnesota for the summer and am back on this engine. I was going to put this Mercury engine in my '51 Ford if it ran good. Well, it had over 100 lbs of compression on all cylinders. This is when I ran into the oil pressure problem. Since I got back. I have pulled the pan off the Mercury and plasti-gaged a couple of rod bearings. Both were at .002 and looked good. Since the Mercury pan and pickup won't work in the Ford, I swapped the oil pump. pickup and pan from the Ford onto the Mercury engine. I did this because the Ford engine always had good oil pressure (it was getting low on compression).
Anyway after all of this. I bolted it back on my test stand and hooked up the 6 volt Optima. After about 15 seconds of cranking, it showed a little over 10 lbs of oil pressure on a new mechanical gauge. I think this is enough that I can attempt to start the engine next week. The Mercury pump is withing spec on end clearance (the only figure I can find in the manual). but it's going in the "Questionable Pile" anyway. I may really luck out on this engine. Now, I'm going to have a beer and celebrate. Last edited by tubman; 05-01-2016 at 06:58 AM. |
05-01-2016, 06:37 AM | #32 |
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Location: Central Ohio
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Re: Oil pressure on start-up
Always celebrate - early and often . . . beats the alternative!
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05-01-2016, 08:53 AM | #33 | |
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Join Date: Nov 2012
Location: Wichita KS
Posts: 16,132
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Re: Oil pressure on start-up
Quote:
"The stock Flathead oil pump is a positive displacement gear type, capable of circulating about 15 quarts per minute under ideal conditions when the engine is spinning at 2,000 rpm (the high-volume version pumps approximately 20 percent more). A recent test at Roadrunner Engineering demonstrated that a stock ’46-53 oil filter with restrictor flows about a quart and a half of oil per minute through a clean filter under meaningful conditions of oil pressure (55 psi), temperature (180 degrees F), and viscosity (15W-40). This means that about 10 percent of the oil pumped by the stock pump goes through the filter under these conditions and the rest goes unfiltered to the engine. Therefore, under these same conditions, I estimate that all the oil in a 5- or 6-quart system is filtered in less than five minutes at highway speeds. Not bad and certainly worthwhile!" |
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05-02-2016, 06:45 AM | #34 |
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Join Date: May 2010
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Re: Oil pressure on start-up
I can remember using a pre=oil tank where you put oil in the container then add air pressure with the connect hose or tubing connected to the oil pressure sender fitting, At this point turn on the valve and look at the gage. With the pressure showing turn the engine over by hand which should lubricate all pressure points. ON the chevys you can drive the oil pump through the dizzy hole with a piece of rod attached to a drill ! kx
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