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Discussion Topic:
High Oil Pressure
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Shelby67 |
11-03-2023 @ 6:24 AM
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Member
Posts: 9
Joined: Nov 2023
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Hello to all - a newby here. I just got a '49 F1 with a 59AB flathead V8. Love the truck but had a big problem yesterday. The oil pressure gauge pegged at 80 pounds, and oil was being forced out of the filter canister at an alarming rate. I have to guess that there is a blockage somewhere in the return line, but have no knowledge of flatheads. I hope someone out there can shed some light on this problem. Thanks for any advice you can offer. The canister is mounted forward on the left head, not at the rear as I have seen in other flatheads. I will try to post a photo.
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carcrazy |
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11-03-2023 @ 8:20 AM
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Senior
Posts: 1996
Joined: Oct 2009
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Several things could be causing your problem. When Ford introduced the partial flow oil filtration system, they incorporated a 0.060" restrictor in the line supplying oil to the filter. If this restrictor is missing, too much oil will be going to the filter.
If you recently replaced the filter cartridge, it may have come with a gasket that is too small to properly fit in the cover to seal the oil filter. Take the top off of the filter canister and check to see if the gasket is making a proper seal. If your seal is too small, take the top of the canister to your local NAPA auto parts store and have the counter person find a gasket that will properly fit into your cover.
Oil pressure of 80 PSI at idle is too high. Your oil pressure relief valve within the engine may be stuck closed or plugged up.
Hope this helps.
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ford38v8 |
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11-03-2023 @ 10:11 AM
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Senior
Posts: 2887
Joined: Oct 2009
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Shelby, as mentioned, your oil filter lines and gaskets may now be compromised, but was not the cause of the high pressure issue. If not mistaken, the 8BA has it’s high oressure relief valve integral with the oil pump itself., which is where the problem lays.
Alan
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pauls39coupe |
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11-03-2023 @ 5:28 PM
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Posts: 248
Joined: Jul 2014
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I guess we need more information. This appears to be a 46-48 engine not the correct 8BA.
Did this just happen?
Did it happen when you changed the oil and/or the filter? if so is the filter correct for a 59AB. There are several different filters out there including ones for Ford tractors.
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Shelby67 |
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11-04-2023 @ 5:25 AM
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Member
Posts: 9
Joined: Nov 2023
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Thanks guys for the help. Further to my earlier post, I did have the filter out the day prior to this happening. I was looking for the filler tube - which seems to be nonexistent - and removed the top of the canister. I took the filter out momentarily then reinstalled the same one after adding about a half quart of oil. I'm thinking that I must have dislodged some sludge which then clogged the return line. Not having any prior knowledge of how the 59AB oil system works, I have tried to find a schematic of the flow to know where to look for the blockage. So far no luck there. Will get back to you once I have had the chance to try blowing out the line.
Thanks again.
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51woodie |
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11-04-2023 @ 8:50 AM
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Senior
Posts: 564
Joined: Jan 2017
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The oil filler on the 59AB in my '46 Coupe, is located at the back of the engine above the fuel pump, between the choke and throttle rods . The picture you posted isn't clear to me, as to what is at the back of your engine. If you have one, turn the cap/vent 1/8 turn counter clockwise then lift.
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kubes40 |
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11-04-2023 @ 12:40 PM
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Senior
Posts: 3583
Joined: Oct 2009
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Shelby, It appears that your filter is mounted in the correct place. If you see one mounted towards the rear, that's just plain incorrect.
Your return line is steel and is easy to remove if you want to satisfy your curiosity in regard to whether or not the line is clogged.
The high oil pressure reading on your gauge may be accurate but then again, it may be inaccurate. I'd suggest you hook up a mechanical gauge momentarily and see if your dash cluster gauge is reading properly.
The leak at the canister lid is most likely due to the gasket not being seated well.
If the oil restrictor is absent, your pressure will drop noticeably. That restrictor must be in place.
Mike "Kube" Kubarth
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pauls39coupe |
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11-04-2023 @ 6:57 PM
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Member
Posts: 248
Joined: Jul 2014
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It looks like you have a 8BA style fuel pump stand on an earlier style block (59AB). Normally there would be a breather/oil fill port above the fuel pump. The 8BA manifolds had a breather/fill tube on the left front about where your oil filter is.
You have kind of a Frankenstein engine there with parts from two different engine families. The oil pressure sending units can be different as can their location. If it is mounted on the filter crud could be plugging the sending unit.
I would try to blow out the return line and make sure the oil filter is clean and correct for a 1946-48 engine.
A photo taken from the left side of the engine may help us help you.
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40 Coupe |
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11-05-2023 @ 5:25 AM
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Senior
Posts: 1806
Joined: Oct 2009
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The 80# of oil pressure on your cold engine is not a problem, It should decrease after the engine warms. Suggest placing a mechanical 100# gauge on the engine to check the pressure is not higher than 80. The top of the oil filter should have two gaskets, one at the top bolt and the second is in the perimeter of the cap which seals against the top edge of the lower part of the filter housing.
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Shelby67 |
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11-06-2023 @ 7:17 AM
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Member
Posts: 9
Joined: Nov 2023
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Thanks again to all who have replied to my cry for help. We have been away the past few days, so nothing has gotten done regarding the truck. I hope to have more to report later today.
Hal (Shelby67)
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