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Slight engine vibration
#1382824 Fri Oct 30 2020 04:37 PM
Joined: Mar 2017
Posts: 274
LeeD Offline OP
Shop Shark
When I started up this morning I could feel a funny vibration that I had not noticed before. The rpm was up a little as it was still cold, and I could feel a rythmic vibration that would last about 2 seconds, then go away for about 4 seconds. Not sure if this is related, but since I have had the truck, there is a slight vibration that I can feel in the steering wheel that slowly gets worse until at about 40MPH, what sounds like a piece of sheet metal vibrating starts up and then goes away at about 45 MPH. The vibration in the steering wheel continues to increase, and at this speed, I can now feel it in the dash. The generator was overhauled about 2 years ago; the water pump and harmonic balancer are of unknown age. I watched the front of the engine and reved it up and down some and nothing looks loose, and it all sounds good. Right now it is not bad and does not bother me. I spend most of my time at about 40mph anyway, so it is not too noticeable. But if this is a sign of maybe a component on its way out, it would be nice to get it fixed before it fails.
Thanks, Lee.

1956 Chevy 3200, 235 w/3 speed
Re: Slight engine vibration
LeeD #1382832 Fri Oct 30 2020 05:34 PM
Joined: Apr 2005
Posts: 9,291
Grease Monkey, Moderator General Truck Talk & Greasy Spoon
Tire tread separations. I know this doesn’t take into account “sheet metal vibrating” but it could account for vibration at different speeds. Good luck.

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Re: Slight engine vibration
LeeD #1382837 Fri Oct 30 2020 05:51 PM
Joined: Feb 2004
Posts: 21,599
A tire won't cause vibrations on startup. I'd suggest loosening or removing the fan belt on a cold start to see if the shake is internal or external. A slightly bent fan blade can cause some oddball harmonics at various engine and/or vehicle speeds, and some types of tires can develop flat spots when they sit for extended periods of time- - - -the dreaded "nylon thump" that early synthetic cord tires used to have. I've seen those things have teeth-rattling shakes for 5 miles or more on a cold day!

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Re: Slight engine vibration
LeeD #1382856 Fri Oct 30 2020 07:58 PM
Joined: Mar 2017
Posts: 274
LeeD Offline OP
Shop Shark
I’ll try removing the belt next time I run it; that will eliminate the pump, fan, and generator if the vibration is still there. The tires where replaced when I got the truck, so only about 4 years old and not very many miles. Though a bad tire from the factory is still a bad tire.

1956 Chevy 3200, 235 w/3 speed

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