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EFV-8 Club Forum / General Ford Discussion / 59A Oil Pan Seam

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Discussion Topic: 59A Oil Pan Seam

len47merc

10-10-2025 @ 2:02 PM

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Has anyone ever seen this and if so what quick fix might one recommend? 59A block/pan on a Motor City Flathead (i.e., I know, our site here is for originality but this pan is 'original') and, while not of significance, it very slowly seeps from the seam and of course drips. As you can see from the pics the car is on a 4-post lift and I can wipe it squeaky clean and dry up to the flange on the block and a drip or two will show within 24 hours. The drain plug and sides of the pan up to the block will still be dry. Wiping the seam dry, within an hour or so oil will begin to show in the seam.

Appreciate any thoughts and best case resolve without pulling the pan (which I've done before on my bone stock '47 59AB with the front end still in the car). Also, really do not care to pull the pan and weld the seam but perhaps that is best solution.

The pics show the pan after being wiped clear ~1 hour prior and you can see the reflective line of oil beginning to show. More of an annoyance than a critical issue - engine does not lose a quart between oil changes. I can accept the obligatory rear seal leak as a given, but not the oil pan seam.

Thanks in advance (see pics). Steve

Steve

This message was edited by len47merc on 10-10-25 @ 2:07 PM

carcrazy

10-10-2025 @ 3:55 PM

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When your 59A Engine was rebuilt was the rear of the crankshaft modified (if it was an early 59A) for use of a rope type rear main oil seal? If not, oil will leak past the labyrinth type of rear oil "seal". The oil leaked past the rear main will accumulate in the portion of the oil pan that serves as the bottom of the bell housing. This oil is free to coat the interior surfaces of this rear portion of the oil pan and eventually leak past the seam on the bottom of the pan.

The best way to cure this problem is to remove the oil pan and have a rope type of rear oil seal installed in the engine. Doing this will cure the cause of the problem rather than just masking the symptoms of it.

len47merc

10-11-2025 @ 3:49 AM

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Thanks carcrazy - I do not know how Motor City Flathead (MCF) handled this attribute of their build on this particular engine (likely in or around 20 years ago). My '47 59AB never leaked/dripped in this location, only from the cotter pin, so my suspicion is that as you say a rope seal was not employed assuming that to be the root cause. The drip from this seam far exceeds the 'normal' drip from the cotter pin on other stock flatheads I've owned though those have all been 59ABs. This 59A build has only a bit over 4,000 miles on it from the prior owner and again, the leak is not egregious, but it is annoying as in my mind it 'shouldn't be this way'.

Thanks - S

Steve

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