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12-11-2021, 06:17 PM | #1 |
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32 Flathead clacking noise
I have a noise in my 32 flathead and I have no idea where it’s coming from. It was noisy enough that I figured the valves needed adjusting, so I replaced the mushroom valves and split guides for the later straight stem valves, one piece guides and adjustable lifters. I adjusted the gaps and re-checked them before installing the head and intake manifold. When I ran the engine, the noise was still there. I checked it with my stethoscope and everything seemed fine, even heard the cam quietly working the valves. The only spot on the engine where I heard the clack, believe it or not, was on the top of the left water pump outlet. I removed the belt and pump, and the pump turned smoothly without any metal to metal contact. I don’t want to run that rare 32 engine until I get this problem solved. The last thing I want is to damage it.
So at this point I’m baffled and have no idea where this metallic clacking is coming from. Any ideas out there? Last edited by jagford; 12-11-2021 at 06:20 PM. Reason: Removed Unnecessary comment |
12-11-2021, 06:27 PM | #2 |
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Re: 32 Flathead clacking noise
When you determined that the noise was coming from the area of the left pump, did you remove the belt and run the engine to see if the noise went away? (you should have)
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12-11-2021, 08:15 PM | #3 |
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Re: 32 Flathead clacking noise
If it is so rare, which it is fairly so, why would you change the entire valve train except the camshaft (presumably)? All my restored '32 engines run just fine with the original '32 mushroom valves, split guides with the lip for the valve springs, big valve springs and spring retainers, and original non-adjustable lifters as they did originally.
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12-12-2021, 12:44 AM | #4 |
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Re: 32 Flathead clacking noise
RG 10 had member with a bump on his pump belt. thump-thump took forever to find it. Newc
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12-12-2021, 03:22 PM | #5 |
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Re: 32 Flathead clacking noise
I ran the engine and the noise didn’t go away after I removed the belt and pump
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12-12-2021, 03:27 PM | #6 |
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Re: 32 Flathead clacking noise
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12-12-2021, 03:33 PM | #7 |
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Re: 32 Flathead clacking noise
Mine did too, for 30,000 miles. When the clacking noise began, I thought it was worn valves. That’s why I decided to change out the valves with adjustable lifters. When I fired it up, the clack was still there. Still puzzled. Any more ideas?
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12-12-2021, 05:25 PM | #8 |
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Re: 32 Flathead clacking noise
Fuel pump push rod??? Or, maybe something going on in the distributor...
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12-13-2021, 05:37 AM | #9 |
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Re: 32 Flathead clacking noise
Is it possible that a distributor hold bolt is too long and just touching the cam gear ? Reason I ask , I just disassembled a 21 stud that I have had since the late 70s and it was obviously rebuilt and not even broken in . It had a mark on the cam gear that Ive never seen , further investigation revealed someone used the incorrect bolt for the distributor. It was hitting the gear . I cant find anything else wrong with the motor and can only assume it was removed due to a noise .
Just a wild guess . |
12-13-2021, 07:43 AM | #10 |
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Re: 32 Flathead clacking noise
Could it be a blown manifold exhaust gasket making that noise?
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12-13-2021, 08:14 AM | #11 |
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Re: 32 Flathead clacking noise
Maybe you can record the sound and if the audio is good enough, post the file on Youtube for us to come and checkout?
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12-13-2021, 12:15 PM | #12 |
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Re: 32 Flathead clacking noise
No rod-Using an electric pump, but thanks for the suggestion
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12-13-2021, 12:16 PM | #13 |
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Re: 32 Flathead clacking noise
I used the correct shoulder boltsAnd there were no marks on the timing gear. But Good suggestion. Thanks
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12-13-2021, 12:19 PM | #14 |
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Re: 32 Flathead clacking noise
The only thing I saw amiss in the engine was a loose oil slinger on the front of the crankshaft, and I didn’t know how to fix it without dropping the pan. But I can’t imagine that little piece of sheet metal making such a loud clack
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12-13-2021, 12:21 PM | #15 |
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Re: 32 Flathead clacking noise
Recording the sound is a good suggestion. I’ll do that, but how do I post it on YouTube so everyone can find it? I don’t use YouTube. Can I post a video on this stream?
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12-15-2021, 01:00 PM | #16 |
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Re: 32 Flathead clacking noise
How does the slinger on the front of the crank get loose? That's supposed to be clamped tight when all assembled.
If the noise comes from the left front, could there be a loose #5 piston? Or the bearing/babbit is worn on #5? |
12-15-2021, 02:24 PM | #17 |
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Re: 32 Flathead clacking noise
Try pulling plug wires one at a time with the engine idling. If it’s a piston making noise, it might stop when you take away the power stroke…..Mark
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12-15-2021, 07:55 PM | #18 |
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Re: 32 Flathead clacking noise
Not sure I know just what a clack sounds like, but just a thought. Wrong location though, but you know how sound travels. See if the tube that extends out of the underside of the fuel pump stand has dropped and is bouncing up and down on the cam I like to have never located that sound wwen mine dropped off/down.
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12-15-2021, 09:45 PM | #19 |
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Re: 32 Flathead clacking noise
Sorry Lawson, in a '32 there is no tube beneath the fuel pump (assuming that he is using an original pump), just the operating push rod. The first of such a tube is the '35 V8.
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