| Shelby67 | -- 11-03-2023 @ 6:24 AM |
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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 | -- 11-03-2023 @ 8:20 AM |
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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 | -- 11-03-2023 @ 10:11 AM |
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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 | -- 11-03-2023 @ 5:28 PM |
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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 | -- 11-04-2023 @ 5:25 AM |
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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 | -- 11-04-2023 @ 8:50 AM |
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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 | -- 11-04-2023 @ 12:40 PM |
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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 | -- 11-04-2023 @ 6:57 PM |
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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 | -- 11-05-2023 @ 5:25 AM |
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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 | -- 11-06-2023 @ 7:17 AM |
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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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| Shelby67 | -- 11-07-2023 @ 3:35 AM |
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Here's the photo from the left side. The breather/filler tube is on the back of the engine, as noted by you and others, and has a trumpet cap (second photo). Thanks for helping. Hal Shelby67
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| Cecil/WV | -- 11-10-2023 @ 12:28 PM |
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Whether the filter is plugged or not has nothing to do with the high pressure, if it had no filter, there would be a pipe plug in the block where the pressure line goes to the filter totaly closing off that flow from the factory! Cecil/WV
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| 37RAGTOPMAN | -- 11-11-2023 @ 2:32 PM |
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a few questions, on high oil pressure, did you try a different oil pressure gauge , and what is the reading, ? it might be that there was a bad gasket on the oil filter, making it leak ? did you check the sending unit, if it the correct. also the oil pump should have a pressure relief valve built in if it is a 80 lb pump it made be stuck or clogged, lets hear how you made out, 37 Ragtopman ,Maine
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| TomO | -- 11-12-2023 @ 4:10 PM |
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The oil pressure reading is most likely from a grounded wire going to the oil pressure sending unit. Tom
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| Shelby67 | -- 11-13-2023 @ 5:24 PM |
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I put in a new filter and gasket but still having oil spilling out around the gasket. After several tries to seat the gasket, I gave up getting a good seal. The next step is going to be draining the oil, removing the feed and return lines and trying to blow them out. Will advise if this works. Does anyone know if there is a special trick/method to get a good seat on the filter gasket? It just doesn't want to stay in place. Thanks.
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| RAK402 | -- 11-13-2023 @ 6:47 PM |
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You can put Permatex or something similar on both sides of the filter gasket. That will help seal it but you will have to do some cleaning when you remove the top to change the cartridge.
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| Shelby67 | -- 11-13-2023 @ 7:17 PM |
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Good call - Thanks.
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| 39 Ken | -- 11-14-2023 @ 4:46 AM |
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Is the oil leaking from the outer edge of canister? If so, double check the canister lid (top) to make sure there is only one gasket there in the outer edge recess. It is easy to mistake the outer edge seal for the inner groove of the lid itself. If you mistakenly install another gasket over the old one, it will leak.
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| Shelby67 | -- 11-26-2023 @ 5:30 AM |
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Thanks again to all who have replied with helpful suggestions. I have learned a lot through this exercise. Finally got time to remove the return line - it was clear. Drained the oil and checked inside the filter cannister for sludge - found plenty. Rodded out the return hole and reconnected the return line, then replaced the oil. New filter and seal installed and finally I'm getting 'normal' pressure readings and no leaks. Pressure now reading 25 - 30 pounds after warmup. The new seal seemed to be a bit thicker than the one I removed - not sure if it was a seal problem all along, but glad to have the "Ramblin' Wreck" back on the road. Hope you all had a great Thanksgiving! Hal
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| JayChicago | -- 11-27-2023 @ 10:10 AM |
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Glad to hear the filter leak got resolved. But I don't see how that had anything to do with the high oil pressure reading. TomO's post seems to make most sense to me. And if there was an intermittent short on the gauge-to-sender wire, you may see it happen again.
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