V6Discussion and questions about the base carbureted or MPFI V6's and the rare SFI Turbo V6.
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i have recently swapped an 89 2.8 into my 86 bird and now it has a bad shake to it. im assuming its the flywheel but ive searched for 3 hours and cant get a sure answer... my 86 is a 5speed and the 89 was auto so i couldnt swap the flywheels i have also eliminated the whole smog system so is it possible i didnt "fix" the lines right... also i just wanted to get is started because i completely tore the engine down and wanted to hear it start after 2 weeks of working on it so i have some exhaust leaks and the airfilter to throttle body are just kinda in place so im sure there are some leaks there so i just want to make sure the flywheel is ok but anyother advise would be greatly appreciated
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gotta switch out the automatic flexplate for a flywheel neutral balanced i think. plus the pressure plate won't bolt up to the flexplate. good luck. im sure some one else will chime in if im wrong.
well i have the pressure plate on the flywheel (from the 86) im just not sure if the 86 was externally balanced and the 89 is internally balanced or vise versa or if its all the same ... im going to hook up the air filter set up completly and fix the exhaust leaks im sure it will help
just looked it up the 89 engine is internaly balanced. looks like 86 is externaly balanced. 87 is when they started internaly balanced engines. soo you need an internaly balanced flywheel for 87-89.
i did something quite simmilar but used the same year 89-89 one auto other manual. just swapped over the flywheel from the blown engine which was manual to the auto engine. with no ill effect.
i had the same problem with my 2.8 its your flex plate, is the 2.8 was pulld from an automatic transmission you need a different flex plate and fly wheel or else it will continue shakeing. if you dont fix the shakeing issue you will end up with a god aweful knocking in the engin from a cilinder comeing loose.
I see you're in CT. When I looked a couple of years ago, there were several yards in the Hartford area that had F-bodies. Call around and see if you can get a flywheel (NOT a flexplate... they're 2 different things) for an 87/88-95 F-body 2.8/3.1/3.4 or even an S10 (up to 93 when they stopped using the 2.8 as the V6 engine). I had to get mine shipped from Texas when I did my swap. Just make sure to ask if the wheel will need to be resurfaced first as that will cost extra at a machine shop.
BTW, not only could the main bearings get screwed up, but so could the engine block itself. I've seen it happen. Line boring the block is BIG $$$.
knock the weights off the 86 flywheel, they are all made "net" balanced, then weights were added.
remove weights............
__________________ 86 Pontiac Firebird
[68 Firebird hoodscoops, custom notchback,
custom rear mounted tach, inverted wing.] http://www.thirdgen.org/techboard/v6...-all-over.html
I love my new notch-back. See link for newer pics and above mods.
knock the weights off the 86 flywheel, they are all made "net" balanced, then weights were added.
remove weights............
That's easy enough, but there is a chance it could crack , especially with as old as it is. If it were me, I'd rather just see if maybe I could do a swap at a yard for the right one. You're not going to be using the old one anyways, right?
yea i was figuring that was the issue.. i had called napa earlier to see if the flywheels were different and they claim that its the same part # and they say that the bolts are the difference ... which makes no sense to me but any way i guess im pulling it out tomorrow and seeing if i can knock the weight off because i know none of the parts stores will have the rite one around here and last time i called all the junkyards looking for something i had no luck even finding a car to get parts off of... but thanks for the help you guys
ok pulled it off today and there is no weight it just has holes drilled into it so i guess im buying a flywheel so does anyone have a suggestion on a place to buy one and a part number i dont trust the local places that tell me that they are the same thing
ok pulled it off today and there is no weight it just has holes drilled into it so i guess im buying a flywheel so does anyone have a suggestion on a place to buy one and a part number i dont trust the local places that tell me that they are the same thing
1. From personal experience, the people running the NAPA stores are a bunch of idiots. A few times now I have gotten the wrong parts, a water pump gasket for my 2.8 and a set of brake shoes for another car. And that was just me. A few of my classmates (while I was going to school in East Windsor) got screwed even worse by NAPA.
2. Are you looking at the CRANK side of the flywheel? That's usually where the weight is.
3. Try asking for a flywheel for a 90-92 3.1 or 93-95 3.4. That should work. If I were you, I'd try to nab this one ASAP, as he supposedly only has 3:
well it has what looks like a weight cast into it on the crank side but i dont think its possible to get it off but i might as well just buy a new one now that ive pulled it out ill post pics of the flywheel tomorrow for you guys
here are the pics that weight on the top of the flywheel in the first pic doesnt seem like it can some off easily i do have a plasma cutter and grinding wheel if i need to get it off
You can either spend a few $$$ on some grinding wheels and grind the weight off, or you can send for one from that eBay link I posted above. Should come out to the same price either way, and both are cheaper than new.
Looks cast in, other I have seen were spot weld on, like a brake drums, but they came off easy with a good whack.
__________________ 86 Pontiac Firebird
[68 Firebird hoodscoops, custom notchback,
custom rear mounted tach, inverted wing.] http://www.thirdgen.org/techboard/v6...-all-over.html
I love my new notch-back. See link for newer pics and above mods.
, especially with as old as it is. If it were me, I'd rather just see if maybe I could do a swap at a yard for the right one. You're not going to be using the old one anyways, right? 
