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08-10-2021, 09:54 PM | #1 |
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Valve timing on a '35 engine
Hi all,
Quick question regarding the valve timing on a '35 engine. Years ago I had the engine rebuilt in my Grandfathers '34. It's never run quite right since it came back. My father and I brought (drove) it back to the shop that did the engine to have him look (listen) to it. He thinks that the timing between the camshaft and crankshaft are off. I know I checked the marks on both pulleys and they were correct, but what are the chances that the gear is pressed on incorrectly? I did a search regarding timing gears, but didn't come across any photos of how they are supposed to look. What is the valve timing for these engines? The plan is to take a degree wheel to the crank and see where the valves are opening and closing. Thank you. Red |
08-10-2021, 11:04 PM | #2 |
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Re: Valve timing on a '35 engine
quick and easy check is to have in and ex valves both off their seats same amount with piston at TDC
yes, I have experienced the camgear slipping on the camshaft with these engines. Now, after verifying correct valve timing, I drill and tap and fit a grubscrew [scotch key] on the seam between these two components to prevent gear ever moving.
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Unfortunately, two half wits don't make a whole wit! Last edited by Brian; 08-10-2021 at 11:09 PM. |
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08-11-2021, 07:37 AM | #3 |
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Re: Valve timing on a '35 engine
Brian,
In my search of cam gear and valve timing, I remember seeing the post you made on the grub screw. Thank you. Red |
08-11-2021, 06:21 PM | #4 |
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Re: Valve timing on a '35 engine
This is a picture of the index marks on the cam gear and cam shaft on my 1935 Phaeton. Not easy to see if you don't know what you are looking for. I learned the hard way. My engine rebuilder had an apprentice reassemble the engine and he totally screwed up the cam gear cam shaft assembly. Of course the engine did not run. Not easy to fix either!
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08-12-2021, 01:11 PM | #5 |
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Re: Valve timing on a '35 engine
Has anyone heard of the timing marks not being in the correct location? My engine guy wants to degree the camshaft to make sure everything is copacetic, but I haven't found much for the actual valve timing BTDC.
Thanks guys. Red |
08-12-2021, 01:21 PM | #6 |
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Re: Valve timing on a '35 engine
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Has your 'engine guy' verified timing using the split overlap method I mentioned in my first reply?
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08-12-2021, 02:32 PM | #7 |
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Re: Valve timing on a '35 engine
Brian,
I should be able to get a few photos in the next few days. I just reread your first post, I will mention that to the engine guy. I still have to take the engine out of the truck, but I'm hoping I can do that tomorrow. Thanks again. Red |
08-13-2021, 07:55 PM | #8 |
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Re: Valve timing on a '35 engine
These good people have a bunch of camshaft information including the numbers for a stock 32-36 cam:
https://www.tildentechnologies.com/Cams/CamHistory.html |
08-13-2021, 08:11 PM | #9 |
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Re: Valve timing on a '35 engine
38 Coupe,
Very good information there Sir, thank you. Red |
08-13-2021, 09:32 PM | #10 | |
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Re: Valve timing on a '35 engine
Quote:
Bill. |
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08-14-2021, 01:38 PM | #11 |
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Re: Valve timing on a '35 engine
The camshaft, valve timing on 1936 and earlier engines, is:
In 9.5/54.5 Ex 57.5/6.5
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Frank '35 Ford Model 51 '48 Ford F3 '54 Ford Tudor Mainline |
08-14-2021, 02:28 PM | #12 |
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Re: Valve timing on a '35 engine
I believe the above numbers pertain to pre 34 engines with steel camshafts. In 1935 Ford introduced cast iron camshafts and 'detuned' them somewhat to suit the bigger, heavier bodies.
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08-15-2021, 12:47 AM | #13 |
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Re: Valve timing on a '35 engine
Brian, where does your info come from? Can you cite it?
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Frank '35 Ford Model 51 '48 Ford F3 '54 Ford Tudor Mainline |
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