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10-10-2023, 02:46 AM | #1 |
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1937 model 74 blowing the blues
Hey guys,
Short story, the car I bought has gone from a 10 a day smoker to a couple of packs a day smoker. The last run was for around 100 miles and burnt over a quart of oil. There isn't any real obvious smoke on start up, its when you hit the road there is a fair whack of blue smoke coming out the exhaust. Enough to piss of other drivers and the police. I did a compression test today and got 6 cylinders at 60 psi and 2 cylinders at 85/90 psi. I did realise after putting everything back together that I hadn't held the throttle wide open. Car runs like a top otherwise. EVERYTHING has been reconditioned on this car asides the engine. In my opinion it's pointing to rings. Am I right? Totally new to old cars. |
10-10-2023, 07:59 AM | #2 |
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Re: 1937 model 74 blowing the blues
you do not say which engine you have, 60,21 std 85 or 24 std 100hp. If its the 85 with sleeves, may be rings. 100, wore out bore and rings. 60 stuck rings.
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10-10-2023, 08:47 AM | #3 |
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Re: 1937 model 74 blowing the blues
Time for an engine rebuild as it's not going to get better.
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10-10-2023, 08:59 AM | #4 |
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Re: 1937 model 74 blowing the blues
This summer I put 1200 miles on a '37 tudor with the same issue you have described. Same cylinder psi. That engine started up and ran great. Burnt oil and was low on power. I just replaced it with a fresh 221, 21 stud and wow, what a difference.
Yes, It's time for a rebuild. It will be worth the cost in fun alone. In fact I not only installed a fresh engine, I rebuilt the transmission and 3rd Gen Automotive built me a 3.25 rear end. I did 75 mph recently. |
10-10-2023, 10:08 AM | #5 |
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Re: 1937 model 74 blowing the blues
I purchased a 221 in 1950 - burned oil as you describe. I ran detergent oil and it cleared the problem. I also cleaned 3/4 inch of sludge out of the pan. I could always depend on 86 mph and even hit 92 once. Never replaced rings or bearings.
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10-10-2023, 11:07 AM | #6 |
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Re: 1937 model 74 blowing the blues
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It could have tin sleeves, steel pistons, the sleeves could have worn through the surface hardening |
10-10-2023, 05:33 PM | #7 |
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Re: 1937 model 74 blowing the blues
JimTN, It's the 60hp 21 stud.
Last edited by Dameon Hubbard; 10-10-2023 at 05:46 PM. |
10-10-2023, 05:45 PM | #8 |
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Re: 1937 model 74 blowing the blues
19Fordy, Yeah, I'm totally with you. I've rebuilt everything else, so it makes sense to finish the car and do this engine.
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10-10-2023, 05:49 PM | #9 |
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Re: 1937 model 74 blowing the blues
Seth Swoboda, yip. Rip off the band aid.
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10-10-2023, 05:51 PM | #10 |
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Re: 1937 model 74 blowing the blues
If it has been sitting, sometings the rings get stuck in the lands of the piston. You could try the Bill OH suggestion before you give up on the engine. I would go one step further than Bill and add a quart of marvel mystery oil to the new non detergent oil and a healthy slug of it into the gas in your tank. Then run it hard, but keep your eye on the oil pressure. What has it been showing so far on the oil pressure gauge?
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Owner/Operator of 'Jailbar Ranch' on the side of Mt. Pickett. Current stable consists of 1946 1/2 ton pickup turned woodie wagon with FH V8, 1946 Tonner Pickup with 226 H six, 1979 Toyota landcruiser wagon, now wearing 1947 Ford Jailbar sheet metal. 'Rusty ol' floorboards, hot on their feet' (Alan Jackson) |
10-10-2023, 05:52 PM | #11 | |
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Re: 1937 model 74 blowing the blues
Quote:
I would suggest changing the oil, I use Castrol 20/50 in FL heat, add MMO, 6 oz, and run it a couple hundred miles and do it again. Add MMO (Marvel Mystery Oil), to the gas tank as well, same amount on 10 gals. I did this when I purchased my '35 after sitting for many years and it did clear up. It will and should consume a little oil but not smoke. Good Luck! |
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10-10-2023, 06:05 PM | #12 |
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Re: 1937 model 74 blowing the blues
I stand by Kroil oil in the gas and crankcase to loosen rings and stuck valves.
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10-10-2023, 06:06 PM | #13 |
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Re: 1937 model 74 blowing the blues
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10-10-2023, 08:02 PM | #14 |
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Re: 1937 model 74 blowing the blues
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10-10-2023, 10:33 PM | #15 | |
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Re: 1937 model 74 blowing the blues
Quote:
__________________
Owner/Operator of 'Jailbar Ranch' on the side of Mt. Pickett. Current stable consists of 1946 1/2 ton pickup turned woodie wagon with FH V8, 1946 Tonner Pickup with 226 H six, 1979 Toyota landcruiser wagon, now wearing 1947 Ford Jailbar sheet metal. 'Rusty ol' floorboards, hot on their feet' (Alan Jackson) |
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10-10-2023, 10:38 PM | #16 |
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Re: 1937 model 74 blowing the blues
I have heard nothing but good things about kroil, so I can only imagine it gets where it's needed when taken internally by an engine.
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Owner/Operator of 'Jailbar Ranch' on the side of Mt. Pickett. Current stable consists of 1946 1/2 ton pickup turned woodie wagon with FH V8, 1946 Tonner Pickup with 226 H six, 1979 Toyota landcruiser wagon, now wearing 1947 Ford Jailbar sheet metal. 'Rusty ol' floorboards, hot on their feet' (Alan Jackson) |
10-11-2023, 01:17 AM | #17 | |
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Re: 1937 model 74 blowing the blues
Quote:
When the manifold was taken off we checked for stuck valves and got them all looking good (there were two stuck). Last edited by Dameon Hubbard; 10-11-2023 at 01:25 AM. |
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10-11-2023, 01:43 AM | #18 | |
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Re: 1937 model 74 blowing the blues
Quote:
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10-11-2023, 02:42 AM | #19 |
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Re: 1937 model 74 blowing the blues
Actually, after a bit of research, me buggering that valve has just confirmed that the head and intake are coming off now regardless.
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10-11-2023, 05:19 AM | #20 |
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Re: 1937 model 74 blowing the blues
How did you bend a valve doing a compression test??
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