Chev 350 Engine Vibration
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Chev 350 Engine Vibration
Posted: November 30 2003 02:22 PM
 
Tom Dowd (aka TomDowd) [ View ] [ heartbeat39@earthlink.net ] [ Car Ads ] [ Blogs ]
Bothell, Washington
(425) 920-5371
 
I have chasing down an engine vibration for a long time, I noticed today by toucing my altenator that I could feel the vibration is that possible ? It is really prominent at low rpms seems to disapate at higher rpms.Is there any where else to look?Damper?Torque Converter? Any ideas would be helpful.
 
 
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Posted by rodsnhawgs  -  11/27/2003 01:37 PM

As with any rotating mass, harmonics will change with rpm. Without getting too crazy and technical, let's assume this problem is with the car setting still. Think about all the things that are rotating - crank, A/C compressor, water pump, fan, P/S pump, flexplate, torque convertor, etc. Now, I'm assumming you've checked the things you've mentioned so we can eliminate them - correct?



Remove the belt(s) and see if that eliminates the problem - if so, start checking those remaining unchecked components - I've seen water pumps really carry on but not leak. A broken crankshaft would, more than likely, make a noise - but not always - that's unlikely your problem. Improperly charged A/C compressors can make a vibration as the compressions pulse.



If you're talking about a vibration while driving then we need to talk about other possibilities. Let us know which is the case and let us know what you find.
rodsnhawgs [ View ] [ Email ] [ Blogs ] [ Car Ads ] Saint albans, West Virginia Charter Member since August 2001
 
Posted by plwheelie  -  11/30/2003 02:22 PM

A lot of 350 Chevy engines have a slight viberation around 1700 to 2000 rpm. You can usually feel it in the steering wheel while sitting still. According to GM this is normal. If it is bad viberation, When did it start? What has been changed? Is it a internally balanced engine or a 86 and up externally balanced engine? Do you have the correct flex plate or flywheel for the engine? The later ones have a counter weight on the flexplate. Is it driving, at what speed, on accelloration or decelloration? Do you feel it as a boom in your ears or a shake in the st wheel or floor.



Answers to these questions can help in diagnosing the problem.



Paul
plwheelie [ View ] [ Email ] [ Blogs ] [ Car Ads ] Tahlequah, Oklahoma
 
Posted by sass  -  11/27/2003 08:29 AM

Tom , This will be hard for someone to help with without more detail info.Does the engine really shake? Could it be timing, broken motor mount,carb adjustment, bad plug wires,etc I doubt this is any help and you might have already checked some of these out. Good luck. Gene
sass [ View ] [ Email ] [ Blogs ] [ Car Ads ] Clayton, Kansas
 
Posted by Bill33  -  11/29/2003 02:54 AM
This is a long shot, but I had the same sort of thing happen in a Chevy pickup running a plastic bladed clutch fan, and one of the fan blades had broken off.........it vibrated the whole truck at low speed, but wasn't as bad at higher RPM
Bill33 [ View ] [ Email ] [ Blogs ] [ Car Ads ] Victoria, Canada
 
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