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Flathead project 2 Attachment(s)
This is a flathead motor I bought to tinker around with, I want to learn more about these motors. I believe it's a 39 to 41.
Attachment 118519 Attachment 118523 Will attach more pics as I brake the motor down.. |
Re: Flathead project Side view shows the '39-40 bulges, it seems to have the long crank so not 1938.
Next--pop a head and we can tell for sure whether 221 or 239 originally. It has pulley setup for big truck, and many of those came with 239. |
Re: Flathead project It was out of a big truck or a stationary engine. It had a generator fan. Sounds like a worth while project. G.M.
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Re: Flathead project if it was out of a big truck try and find a set of heads from a car, truck heads are low compression
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Re: Flathead project Weren't the bell housings attached to the block up until 1948 or 49? After that they could be split off, I think..???
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Re: Flathead project I think you need to get it off that motor stand ASAP. You may find it in the floor, if not now its a good chance when you start swinging a wrench on it. The rear of the blocks on the 48 and back cant stand the pressure.
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Re: Flathead project From here I'd call it a 42. It will pass the pencil test and I cain't see any bluges in the pan rail for any core plugs. See if the intake manafold gasket surface is raised up a little from the block. Walt
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Re: Flathead project Hey Walt, I stopped by your place in my 39 P/U in 2006 on my way to Nova Scotia. I had a shrould and a 6 bladed fan on the generator if you recall. G.M.
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Re: Flathead project Quote:
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Re: Flathead project I took the oil pan off, there is four freeze plugs. Does that make it a 39 to 41? The person I bought it from said it came out of a truck. The water pumps also had double pulleys......
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Re: Flathead project 2 Attachment(s)
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Re: Flathead project The motor is stuck, I will be soaking it in oil....
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Re: Flathead project The water pumps are truck. Scrape around the top of the cyl and see if you can see a sign of sleeves in the cyl. The 40-1 had sleeves, I don't think the 39 had sleeves. Walt
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Re: Flathead project It's hard to tell from the photo, but it does not look full of rust and crud in the bores, they look quite clean. So if stuck, it may not have been stuck for long. Again, hard to tell from the pic, but it looks like it may be relieved. My relieved blocks are sort of machined out with a parallel sided cut. That looks like it is shaped to the gasket, ie hand done.
I may be imagining the relief, hard to tell from the pics. I'd be pulling the starter and pumps, manifold and distributor. Anything to take weight off it. You have already been told about the dangers of supporting on the early bellhousing. If you pull the sump you can lever against the ring gear teeth to try and turn it. Be very careful though, it's easy to overdo it, an engine on a stand is very top-heavy. Mart. Edit: Ignore my ramblings re the relief, the gasket is still on, isn't it? Oh yeah, measured the bore yet? A rough measurement should be good enough to tell the original size. |
Re: Flathead project Pull the front cover and the cam gear. The valves are probably stuck. If you pry on it too hard you could ruin a good cam and some lifters. Harley
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Re: Flathead project is the passenger side exhaust manifold rusted out??...otherwise, bores, etc. do look clean....under intake??...keep on having fun....Mike
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Re: Flathead project Marvel mystery oil is a good oil to soak the engine in--ive used it on several...good luck. gump
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Re: Flathead project Thanks for all of the advise, Marvel mystery oil, OK will do. The cylinders mic out at 3.06 dia. Will keep you all posted on my progress. Mart I will figure out a better way to prop the motor. For now was thinking of supporting the end opposite the stand with a saw horse???
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Re: Flathead project 3.06? sounds like a 221 cu in motor at 3-1/16" on a standard bore. Plenty more meat in that one if you want to go bigger. Early days yet, most important thing to be looking for is cracks. Check all around the head faces and around the bottom of the block on the sump face and inside and outside the block around the sump face.
Can't recommend anything re extra support as I can't guarantee what will work. (But anything is better than nothing) Mart. |
Re: Flathead project Quote:
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Re: Flathead project Heads off...freeze plug bulges confirmed...'39-40 221
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Re: Flathead project 2 Attachment(s)
Distributor, water pumps, oil pan removed, yuk!!!! what a mess in side the block...sludge city!!! LOL!!! So far I can't see any cracks.
Attachment 119133 Attachment 119134 |
Re: Flathead project Took the head gaskets off yet?
Mart. |
Re: Flathead project 2 Attachment(s)
Mart,
I left the head gaskets on for now, to protect the mating surface from being damaged while taking the motor apart. Attachment 119389 Attachment 119390 |
Re: Flathead project 1 Attachment(s)
I think this motor has had work done to it in the past, found one of the tappets to be slotted, the rest are the non slotted type..
Attachment 119392 |
Re: Flathead project 5 Attachment(s)
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Re: Flathead project 2 Attachment(s)
And more, Almost ready to bring the block to the machine shop for claeaning and a mag test for cracks. If all OK then a pressure test...I desided that I will bring the block to Eastwoods Auto Machine...
Attachment 119991 Attachment 119992 |
Re: Flathead project The last "Flathead" I tore down and got to this point, pulling the pan was painfull. It had the dreaded pan rail cracks on both side:(
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Re: Flathead project Hey Phil, up here in Me. the salt water is alot cooler than it is in Florida. the clams have to bury in the mud the keep warm. LOL Walt
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Re: Flathead project I don't see any sign of the steel sleeves in the bottom end pic. If it's still 3-1/16 I'd call it a 39 engine. Walt
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Re: Flathead project Walt, there isn't any sleeves, I will call it a 39..No cracks in the block that I can see...
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Re: Flathead project 4 Attachment(s)
The block does not have any cracks in it and it passed the pressure test. More pics...
Attachment 120899 Attachment 120900 Attachment 120901 Attachment 120902 |
Re: Flathead project Looks very nice. Congrats on the crack free status. What process did they use to clean it up?
Mart. |
Re: Flathead project It was dipped in a hot tank about 3 times, 2 days per dip. Mark at Eastwoods auto said it was a dirty block. After the hot dip Mark pressure washed it. He then rough bored the cylinders .030 over.
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Re: Flathead project 2 Attachment(s)
Update, the motor is home from the machine shop, Eastwoods Auto Machine in Somersville CT. Took the advise of quickchange34 and mart and made a bracket to hold the motor from the exhaust ports...see pics...Thanks
Attachment 131922 Attachment 131923 |
Re: Flathead project I keep looking at the intake manifold surface on the block, Of all the pic I still cain't tell if it's a raised intake surface, in some of the pic it looks like it does. But, the engines with a raised surface were late 41-42 and had sleeves, so with no sleeves I'd call it a 39. Walt
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Re: Flathead project Walt, Yes it's a 39. Went to VanPelt sales webpage and I was able to figure it out by there section on how to ID a flathead motor....
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Re: Flathead project I see the head studs have been removed. Did this present any problems? It seems like the hardest problem with the crusty blocks I have worked on.
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Re: Flathead project I did try and remove the head studs myself, but they wouldn't budge. When the block was dipped into the cleaning tank the studs then were able to be removed. I had the machine shop remove them and two of them had to be drilled out.
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Re: Flathead project Just a little warning - don't run a tap down the head stud holes - they are a tight thread and a tap will open them out. Use a thread restorer or an old stud or bolt with a slot cut in it.
If you already knew this I apologise, but it isn't obvious to a novice. Mart. |
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