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08-01-2019, 06:53 PM | #1 |
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just aquired 1931 Model A, help diagnosing oil leak
just got my 1931 ford model a and have a oil leak. there is a bolt missing from front of engine, could this be culprit? here are photos.
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08-01-2019, 07:04 PM | #2 |
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Re: just aquired 1931 Model A, help diagnosing oil leak
Your missing the timing pin. It goes in the thread hole. The hole is open to your timing gears and as they are rotating they are throwing oil out the hole.
https://www.snydersantiqueauto.com/P...earchByKeyword Last edited by Y-Blockhead; 08-01-2019 at 07:10 PM. |
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08-01-2019, 07:10 PM | #3 |
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Re: just aquired 1931 Model A, help diagnosing oil leak
If you don't need to time the engine right now, just find a short bolt that fits the threads and insert it. If it seems to be 'hitting' something inside, that would be the timing gear (camshaft gear), and you need a shorter bolt.....
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08-01-2019, 07:16 PM | #4 |
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Re: just aquired 1931 Model A, help diagnosing oil leak
That would make sense, the previous owner said he adjusted the timing just before I bought it. Must of forgot to put it back in!
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08-01-2019, 07:32 PM | #5 | |
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Re: just aquired 1931 Model A, help diagnosing oil leak
Quote:
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08-01-2019, 07:43 PM | #6 |
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Re: just aquired 1931 Model A, help diagnosing oil leak
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Tom L. |
08-01-2019, 07:47 PM | #7 |
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Re: just aquired 1931 Model A, help diagnosing oil leak
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08-01-2019, 07:57 PM | #8 |
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Re: just aquired 1931 Model A, help diagnosing oil leak
Sparta, I ASSume is where you are from?? Sparta where?
Could the oil have gotten on electrical parts and cause the backfiring? |
08-01-2019, 07:58 PM | #9 |
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Re: just aquired 1931 Model A, help diagnosing oil leak
Hey Tom, it backfires when letting off the gas. Doesn’t do it at idle, but when I shut the car off today, it shot like a pistol.
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08-01-2019, 08:15 PM | #10 |
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Re: just aquired 1931 Model A, help diagnosing oil leak
My first guess would be an induction leak. Like the manifold or the carburetor gasket. Or, maybe you are running your mixture control far from normal. Most folks run the mixture control at 1/4 turn out from closed. I have been running mine at anywhere from 1/4 to closed when the engine is warmed up.
Did you adjust your carburetor for idle and mixture? Tom L. |
08-01-2019, 08:48 PM | #11 |
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Re: just aquired 1931 Model A, help diagnosing oil leak
Well here’s a couple other things to know. I’m seeing a puddle of gas leaking from carb every time after driving it, and it also leaks just as it sits. The choke was stuck until about an hour ago, I was able to loosen it. But because of that, the GAV has been turned all the way clockwise every time I’ve driven it
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08-01-2019, 08:48 PM | #12 |
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Re: just aquired 1931 Model A, help diagnosing oil leak
My father's 31 pickup backfires with every shift when it's hot, it's being caused by a small exhaust leak where the pipe meets the manifold.
I had my timing pin fall out, just like you on my 31 Sport Coupe, then it developed a rattle, which sounded suspiciously like a loose bearing. Turns out the cam gear was loose. I don't know if the timing pin/cam gear incidents were related, but now you have been advised. Sent from my E6810 using Tapatalk |
08-02-2019, 06:37 AM | #13 | |
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Re: just aquired 1931 Model A, help diagnosing oil leak
Quote:
John |
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08-02-2019, 06:44 AM | #14 |
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Re: just aquired 1931 Model A, help diagnosing oil leak
Look for the timing pin under the pulley. If the PO forgot to replace it, that's most likely where it is.
As for the backfire, it sounds like you have an intake leak and a rich carb. What carb are you running?
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08-02-2019, 07:21 AM | #15 |
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Re: just aquired 1931 Model A, help diagnosing oil leak
When I shut my 30 down after parking it I fully retard the spark (full up), put throttle lever full up, shut off gas valve and let her run dry.
If the next morning you still find it drips gas from the carb throat your gas tank shut off is probably not totally closing. That's an easy repair or replace issue. This procedure will identify if the shut-off is bad. As advised, adjust the carb. Here is a link to the instruction manual which is full of great information, including proper carb adjusting procedure. Also a post on leaking carb. Enjoy the adventure... Chap http://motormayhem.net/wp-uploads/20...ion-Manual.pdf https://www.fordbarn.com/forum/showp...22&postcount=6 |
08-02-2019, 07:38 AM | #16 |
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Re: just aquired 1931 Model A, help diagnosing oil leak
When my car pops on decel or shifting I open the GAV a little more and it clears right up. Where was your choke stuck?
I would imagine with the problems you're talking about, taking the carb apart, giving it a good cleaning, new gaskets and a float valve will fix you up. If the choke was stuck you don't know where else gunk may be lurking. I just put in new gaskets and a viton tipped float valve. The transformation is amazing. |
08-02-2019, 08:59 AM | #17 |
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Re: just aquired 1931 Model A, help diagnosing oil leak
I am sure to shutoff the valve after driving. I did shutoff clave with car running to see if it would die, and after about a minute it did.
I have a zenith carb and like I said, every time I’ve driven it, because the Choke was stuck, it’s been fully closed. This morning I checked under the car and there was a small puddle of gas again. I haven’t tried adjusting anything in the carb yet, I’m going To see if adjusting the GAV will help at all. If I wanted to buy a rebuilt zenith carb, who is a good supplier?
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08-02-2019, 09:23 AM | #18 |
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Re: just aquired 1931 Model A, help diagnosing oil leak
Here's what you're missing: https://www.snydersantiqueauto.com/P...ngine/hardware
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08-02-2019, 09:46 AM | #19 |
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Re: just aquired 1931 Model A, help diagnosing oil leak
There are a number of good Model 'A' suppliers who have quality parts. Depending on where you live, Arizona Model A, Sammy Guthrie 480-782-0266 or Bratton's, Walt Bratton 800-255-1929. These guys will help you and you will find others as you expand your Model A world. Ernie in Arizona
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08-02-2019, 10:11 AM | #20 | |
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Re: just aquired 1931 Model A, help diagnosing oil leak
Quote:
You seem to have 2 gas leak issues. -Leaking Shutoff valve. It working well enough to make the carb run out of gas, but has a slow leak over time. Brattons replacement are USA made and guaranteed for 3 years. At the same time you replace recommend you install a pencil filter that filters the gas before it goes through the shutoff valve. https://www.brattons.com/fuel-tank-filter-screen.html https://www.brattons.com/fuel-shut-o...-gas-tank.html - Possible leaking Carb Float Valve. To confirm, while it has been leaking stick your finger as far as it will go into the inside bottom of the air intake. If there is gas the float valve is leaking. It is easily replaced, if works is a lot cheaper that a rebuilt carb. https://www.brattons.com/modern-float-valve.html If buying a rebuilt Berts has an excellent reputation, they test drive the carb on an a car before shipping, and will sent you a carb before they receive your old carb/core. They refund the core charge once they receive your old carb. If ordering, ask for lead time, during their busy season can be 4-6 weeks. https://modelastore.com/index.php?ro...&category_id=0 Last edited by 30 Closed Cab PU; 08-02-2019 at 10:21 AM. Reason: Sent before finishing. added info |
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