what is causing my shifter to vibrate in my 350z?

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GM 350 Crate Engine Vibration please HELP..

• Thread starter bkhudgins
• Start engagement Jun 10, 2011

• #1

Hey I am building my first motorcar, its a 1979 z28. I am almost set up for the engine, so I bought a truck with a running 350 to utilize that engine. I know it is a GM Goodwrench 350 crate engine but that is all I know right at present, I am trying to notice out more merely not getting very far. I will mail service any new info I get. Hither is my problem.....

I got the truck domicile started information technology upwardly and noticed it has a pretty bad vibration. The timing is a liitle off and has bad exhaust leak on left manifold and so its hard to tell how well it is running. But I dont think that vibration should be there. I want to try everything to help determine what the problem is now before I pull the engine. That way I'll know if it is an internal problem.
What can I do???
The truck is an original 305. Perhaps they used the harmonic balancer from the 305. The 305 balancer may work fine. information technology maybe the same.. I dont know.

Perchance its the Flexplate???????

What else can I await for????

Thank you
Brian

• #2

Both 305 & 350 are internal balanced engines, so that wouldn't exist an issue inside itself. You are talking solely almost an engine vibration - while in neutral? There is a possibility that the ring has slipped on balancer or someone has put an external balanced one on. Could too be something with the flexplate.

Are yous planning on a rebuild?

Also - welcome to NastyZ.

• #three

Thanks for the reply. I have a couple of balancer lying around I think i am going to attempt one and see how information technology does. I may change out the flexplate before I install this in my Z..

I plan on running this engine while I build another engine that I have. I want to have my time and exercise most of the build myself. but I deceit wait to drive my new toy...

Since this is a crate engine I guess I can get the flexplate for a 79 camaro 350 that fashion I can use right starter. I have a complete 71 chevy 350 not sure if information technology runs or not.. only is does have balancer and flexplate and I accept a starter to go with that flexplate.. I may use that one and meet how it runs.
What practise yous think?

Thanks... I accept fallen in beloved with this site..

Brian

• #4

Have you tried taking off the belts and running information technology that style? If it still vibrates, that would rule out the accessories as a source for the vibration. If information technology fixes it, then information technology is something unproblematic, due east.g. water pump.

• #5

Beginning thing you need to do is figure out what "Crate Engine" it is. Early or late manner. A casting number would assist.

64-85 engines are neutral balance on the rear of the cranks. 86 they became a external balance flex plate. Information technology is possible you are running the wrong flexplate. The balancers are all neutral so yous dont have to worry nigh that.

• #half dozen

A dead cylinder would also requite the feeling of a vibration. Take y'all verified that the motor is hit on all 8? You can pull one plug wire at a time while it's running, you volition feel and here the motor act up when you pull wires from a good cylinder and will get no change when you pull wire off a non firing cylinder.

• #7

Thanks for all the suggestions. I have already removed the belts. Here is some more info I establish on the casting and engine code.
casting number is: 10066036
Engine code on correct cylinder caput: 1M1119 0vp

Delight bank check out these links.

http://world wide web.camaros.net/forums/archive/alphabetize.php/t-191934.html
According to this guy's info this engine was fabricated in United mexican states nov-19th of 1990.

Hither is another post that has info on casting number but it is not mention the engine code or year built but does mention it is 71-85 replacement engine.
http://answers.yahoo.com/question/index?qid=20091016123256AAnSD9o

So fifty-fifty though this engine was congenital in 1990 it is used to supervene upon the older pre 86 engines meaning I should have an internal residue flexplate???? Or exercise I need the external balance flexplate?

Could a bad torque converter cause these kind of vibes while in park? The reason i ask is beacause this truck will not pull in any gear. With rear wheels of the ground I can put information technology in gear and the wheels will not plough if I rev upwardly they will turn tiresome and calendar week. This may exist trans not torque converter not certain just idea I would mention it.

Thanks once again for your time.
Brian

• #8

• #nine

Will a post 86 flexplate commodities up to a pre 86 engine??
Anyway to expect at the flexplate and tell if its internal or external balance???

I know some of you have said that if the balancer is for a 305 that it doesn't matter. I am hearing two different things. some say all SBC (except 400) are the same. and some say they look the aforementioned but are non and will cause vibrations if using a 305 balancer on a 350. I accept 2 other balancers one on a 350 and one that was said to come off a 350. They both look the same and measure 6.75" in dia. I did not see any numbers on them to look upwardly. The one on my engine looks to exist a 6". it is a little smaller when I compare it to creepo caster'southward. I can't get a skillful measurement on it right now but Its def looks a niggling smaller.

Thanks
Brian

• #10

Ok. I'm straight on the balancer question. Yous guys were right information technology does not matter they are 0 balance.. I am going to go by a slap my friends for the BS adivse they gave me, and the guy at the parts store that I apply. LOL I'm going to take this block to a shop close to my firm and have him look at it. Maybe flexplate? Peradventure wrong crank?? Maybe a pooty assembly line crate engine non worth my time.. We will run into.

Cheers again for the fourth dimension and your suggestions
Brian

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