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02-02-2019, 03:12 PM | #1 |
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Join Date: Feb 2014
Location: Sierra Foothills
Posts: 74
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More ?'s about vibration...
I started another thread since my scenario seems a bit different then what I've been reading thus far about shuddering or vibration..
My truck has a vibration after shifting to 3rd gear, at around 25mph and continues up to 35mph, but haven't gone any faster then that yet! This was a running motor that sat for several years, I dis-assembled, checked everything out an reassembled and it started up on first try...the flywheel had been re-surfaced with new pressure plate and disc with a mark for alignment... but I do not know for certain if it was the exact flywheel that had come off the motor, so that is an unknown as far as it being balanced... There is nothing at idle, or up at higher rpms, no knocks from engine, and other gears have no issues...the motor mounts are stock and correctly set, so I am asking if it is possibly the universal, or what else to consider??? I do realize that the unknown flywheel is a major consideration, but would like to know if there is anything else to consider if by chance the flywheel was properly balanced with the crank... Would like to keep this motor running while another is being rebuilt... Suggestions, advice appreciated.... |
02-02-2019, 03:30 PM | #2 |
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Location: Melbourne, Australia
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Re: More ?'s about vibration...
You mentioned that the pressure plate was indexed to the flywheel but was the flywheel indexed to the crank shaft? I assume you checked the weights of reciprocating components for uniformity.
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02-02-2019, 04:03 PM | #3 |
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Join Date: Feb 2014
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Re: More ?'s about vibration...
No, flywheel was not marked nor was there any work done to ensure everything was balanced. This was a running motor that had sat for many years, have asked if in fact flywheel was replacement....
This was not a rebuild, it was assembled using original parts as soon as was possible to make into a driver for an ailing friend to get a ride in before his time is up...A complete, thorough restoration is pending, would just like to keep this motor usable if at all possible |
02-02-2019, 04:33 PM | #4 |
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Location: Lincoln, Nebraska
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Re: More ?'s about vibration...
If you depress the clutch while it is in the speed/vibration range does the vibration change or stop?
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02-02-2019, 05:51 PM | #5 | ||
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Re: More ?'s about vibration...
Quote:
I acquired it about a year ago, went thru it as stated prior, and was able to get it running... Quote:
Yes it does, only happens while in 3rd gear, under power....either depressing clutch or letting off throttle will lessen or eliminate the vibration...and it does seem to be only while under acceleration, not coasting if that is any indication... |
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02-02-2019, 06:11 PM | #6 |
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Location: Alabama
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Re: More ?'s about vibration...
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02-02-2019, 07:33 PM | #7 | |
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Location: Sierra Foothills
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Re: More ?'s about vibration...
Quote:
Dan Partain drove it a while back and we both agreed it felt like something in drivetrain but it wasn't clear from were...haven't gotten back to finding the cause till now... |
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02-02-2019, 11:49 PM | #8 |
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Location: Melbourne, Australia
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Re: More ?'s about vibration...
Maybe the roller bearing that supports the drive shaft? Universal?
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02-04-2019, 12:17 PM | #9 |
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Re: More ?'s about vibration...
Tires?
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02-04-2019, 12:36 PM | #10 | |
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Location: Sierra Foothills
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Re: More ?'s about vibration...
Quote:
Tires may be a factor, however it feels more like it's under my feet or below cab after shifting into 3rd, so the universal and bearing seem most suspect.... Thanks to all for the replies, will update soon as I've had a chance to inspect further... |
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02-04-2019, 02:10 PM | #11 |
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Join Date: May 2010
Posts: 433
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Re: More ?'s about vibration...
Definitely worth getting a knowledgeable person to take a ride with you, and/or let you ride in their car for comparison and diagnosis. There are a lot of things to look for and experienced eyes and ears will get you closer to the problem before you tear things apart. If there's a Model A Club chapter near you, try to reach out to someone. You might get some great insights, and probably make a new friend! Good luck
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02-05-2019, 02:47 AM | #12 |
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Join Date: May 2010
Location: Between Seattle & Tacoma
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Re: More ?'s about vibration...
A loose pinion nut etc can cause vibration. I’m not sure which is which, but one problem vibrates on acceleration and one problem results in vibration on de acceleration.
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02-05-2019, 07:50 PM | #13 |
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Join Date: Nov 2010
Location: Sedro-Woolley, WA
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Re: More ?'s about vibration...
I had the same symptoms with our 1930 AA stake bed. It turned out that the universal joints on the drive shaft were the problem. Replaced them and the problem was gone. The information that indicated the problem is the speed of the truck dictates the intensity of the rumble and not the speed of the motor. also by pressing on the gas, the vibration gets worse at 25 MPH and up. Our AA is the long wheel base 157".
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02-07-2019, 08:42 PM | #14 |
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Join Date: Nov 2017
Location: North mo.
Posts: 106
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Re: More ?'s about vibration...
I had just about the same preoblem in my 29 two door! it ended up being the ujoint on the transmission. you would not beleive how badly worn it was! I don't know how it stayed together! new ujoint fixed my problem!
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04-01-2019, 04:38 PM | #15 |
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Join Date: Feb 2014
Location: Sierra Foothills
Posts: 74
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Re: More ?'s about vibration...
Update
Replaced u-joint several weeks ago, old one was actually just fine...vibration was still there... Yesterday was able to determine rear axle is the issue, although attempts to remove hubs were unsuccessful...we used the correct tools, didn't get around to using any heat however...but with axle safely supported and front wheels chocked, we ran it in 1st & reverse, noise prominent on drivers side, in axle tube, only slight noise at banjo, but a definite vibration with each rotation of wheel... Time for rear axle rebuild!! Thanks for everyone's input, an Dan for your help! Any Info on NorCal shops doing axle work, pls PM me, thanks... |
04-02-2019, 03:42 PM | #16 |
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Location: SW Idaho
Posts: 970
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Re: More ?'s about vibration...
Some of the repo u-joints are out of alignment. I had one that I assembled on the trans with the clamshell and it locked the trans. I made a shaft to fit the ID. of the splines for the front yoke and the rear yoke. It could not fit through the pair, hence not a common centerline Snyders replaces it, after using my gauge to test alignment.
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04-03-2019, 09:44 AM | #17 | |
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Re: More ?'s about vibration...
Quote:
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