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Discussion Starter #1
I really need some help here. I've recently bought a 66 Stang that the PO put an 84 302 in. It's a C4 tranny. Here's the problem. The thing has a terrible vibration at about 2000 rpm in park. I've read all the threads about 28 vs 50 oz balancers and flexplates. The previous owner put a new balancer Ford part number E1TE-B3A. The flexplate he said he had made by this guy who is supposed to be a Ford Specialist. I looked at the flywheel thru the inspection cover slot and can see that a different weight has been welded on the flexplate.

I had the "Ford Specialist" guy come over and look at the car and he's baffled. He say's it's definitely an imbalance somewhere. He says maybe the PO swapped the crank in the engine, but the PO says he didn't.
I've run the engine with both the E1TE-B3A balancer and a 1968 302 balancer and the vibration appears to be the same. I hate to have to swap out the flexplate and find the vibration still there. Is there any way to find out what crank is in the motor without pulling the pan? Do you think it's possible that this guys balanced flexplate isn't really balanced right.

Unfortunately I have a tight budget so I have to figure this out myself. And I hate the thought of renting equipment multiple times to no avail.

I'll listen to any suggestions/comments at this point.
Thanks fellow VMFr's
 
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Discussion Starter #2
Forgot to ask. Is there enough room to just unbolt the tranny and slide it back and have enough access to remove the flexplate bolts and flexplate? Or do I have to drop the tranny all the way out?

Thanks
 

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The 50oz cranks (5.0L) won't interchange with the earlier cranks because of the rear main configuration so I don't think you need to be concerned with this being swapped out.

The first thing I would do would be a carefull and definitive ID of the engine. Did the PO just THINK it was a 5.0 or did he KNOW, and can you trust that to be correct? Was he thinking "a 5.0 is 302 ci so I have a 5.0). Get the numbers off of the engine that are stamped on the block above the starter and find out for sure.

Once you do that you can buy a stock and correct flexplate for whatever it turns out to be and install it. I don't see any cost savings, given the oppertunity for error, from re-ballancing a flexplate unless you are building a custom ballanced engine, and then all the parts should go to the ballancer tech at the same time and be ballanced as an assembly.

As far as the ford "expert", he may be a great guy, but I'm afraid he didn't do anyboy any favors.

Hal
Love hard, drive fast, wear your seat belt.

PS, that's my 'bird...... My Mustang is too ugly to take pictures of yet........*G*.

http://www.teleport.com/~cosa/bird2.jpg
 
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Discussion Starter #4
The PO said he pulled the engine out of a 84 Mercury Capri. IS there anyway to identify the block other than pulling the starter and looking under there? Any Physical differences that can be seen from on top? I'm not lazy just don't have the facilities at the time to tear it apart.

Also I thought I read that you can't use a 50oz 1984 flexplate cause of the teeth count. Any info?
 

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I had to buy a special flexplate that B&M makes for the 86 5.0 block I'm using to work with my C4. You need a 50 oz, 10.5" Bolt pattern, 157 tooth flexplate. B&M part #50239. Cost me $107 from Summit.

Black primer 66 coupe, bench seat, 68 302-2V, C-4, 3.55 TSD
879 posts as "66 bench-coupe" on old VMF
robert94928 on Yahoo Messenger
 

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BTW: the flexplate that came in the Capri was a 164 tooth, 11.4" bolt pattern. Here's the B&M link: http://www.bmracing.com/noflash/index.html
I pasted this from their Ford flexplate page:
40232 '69-'80 C6 - 302, 351C, 351W with 164 tooth ring gear, 11-7/16" b.c.

50236 '68-'76 C4 - 289, 302 with 157 tooth ring gear, 10-1/2"b.c., 28.2 in. oz balance weight

50237 '77-'82 C4 - 289, 302, 351 with 164 tooth ring gear, 11.4" b.c. 28.2in. oz balance weight

50238 '82-'95 AOD - 302 with 164 tooth ring gear, 11.4" b.c. 50in. oz balance weight

50239 '82-'95 C4 - 302 with 157 tooth ring gear, 10.5" b.c. 50in. oz balance weight (special app.)

50246 Small block C4 with 157 tooth ring gear, 10.5" b.c. (for internally balanced engines).


Black primer 66 coupe, bench seat, 68 302-2V, C-4, 3.55 TSD
879 posts as "66 bench-coupe" on old VMF
robert94928 on Yahoo Messenger
 
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Discussion Starter #7
Thanks for the info 66. Did you find out the hard way like me and did you have a vibration or did you plan ahead. Anyone know if I can get the trans back far enough to get to the flexplate mtg bolts without dropping the transmission?
 

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Nope, not the hard way, I hope. . . The drivetrain isn't in the car yet. I just researched it. Too bad your PO didn't do the same thing. Hopefully my new motor and trans will be in by the end of this week! My 5.0 block is from an 86 and I'm mating it up to my freshly rebuilt C4. I bought a 50 oz. stock style dampener from NPD so I could use the stock pulleys. The whole rotating assembly is getting balanced so I shouldn't have any vibration problems. Knock on wood. . .

Black primer 66 coupe, bench seat, 68 302-2V, C-4, 3.55 TSD
879 posts as "66 bench-coupe" on old VMF
robert94928 on Yahoo Messenger
 

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Getting those flexplate bolts off will be a PIA without pulling the trans or the motor. Maybe someone else has some experience here. It might be a good idea to go ahead and pull the motor and have it gone through. I'm sure those vibrations have affected your bearings. Good luck!

Black primer 66 coupe, bench seat, 68 302-2V, C-4, 3.55 TSD
879 posts as "66 bench-coupe" on old VMF
robert94928 on Yahoo Messenger <P ID="edit"><FONT SIZE=-1>Edited by 66benchcoupe on 04/07/01 09:24 AM (server time).</FONT></P>
 
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