Help understanding the relationship between flywheels and engine vibrations - Mustang Evolution

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Old 12-20-2012, 12:07 AM   #1
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Help understanding the relationship between flywheels and engine vibrations

Hello everyone- could use some input from any folks who can spare a minute.

I’ve posted on my car before, and have a new set of questions. The background is, I used to have a 2000 GT, automatic transmission, bought it new. "USED to have" because my son totaled it. Yes, he’s still alive (meaning the accident didn’t kill him, nor did I)…

Not having money for a new car, and not wanting to buy something used that I don’t know the history of, I decided to take the engine out of it and swap it into something else (engine is tip top, I’m anal retentive about maintenance. Have a ’01 Explorer with 250K and a ’96 Ranger with 320K).

I found a solid ride to work with, another 2000 GT, cherry front to rear. Engine was seized (140K), but everything else was stellar. When we took it apart, we found that one of the timing chain tensioners busted, thus the reason for engine seizure.

So, here’s the deal… I’m ok with basics, but I’m not too experienced with more “advanced” concepts- namely, flywheel balancing (which I *think* may be the issue here). The “new” GT is a manual. I wasn’t sure what shape the clutch would be in, so got one ahead of time (just a regular stock). We pulled out the seized engine, swapped in my engine from the automatic, used the new stock clutch and pressure plate I bought, and kept his flywheel and tranny (just stating the obvious). Everything went in fine, we were as careful as can be, and once done car runs like a champ. Except for the vibration. It’s pretty noticeable. Can hear it and feel it and man it feels like crap. So here’s where my inexperience comes in.

A couple of friends suggested that the flywheel may have been balanced with the original engine. I know this may be some basic knowledge for you more steeped folks, it’s just something I never realized the importance of- I’ve only really owned automatics (well, my Ranger is a manual, but hell I’ve never had to do anything with the clutch/tranny). Is this a possibility, and thus a potential cause for the shakes I have now?

If it truly is a case of the flywheel not being in synch with my engine, do I have any options in trying to fix the issue? With a son now in college and Christmas here, I am absolutely too broke to be able to buy another vehicle right now. Plus, I absolutely love this car, it came with lots of nifty aftermarket bolt ons, and I know my engine is in tip top shape.

I’m really dreading the answer that may come out of this. Any advice you can offer would be greatly appreciated.

Phoo
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Old 12-20-2012, 12:15 AM   #2
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I believe the 4.6 is internally balanced where the sbf is balanced with the flywheel, when is the vibration happening?
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Old 12-20-2012, 12:44 AM   #3
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When does it vibrate?
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Old 12-20-2012, 12:48 AM   #4
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Yep
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Old 12-20-2012, 06:18 PM   #5
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Thanks Guys for taking the time to respond.

Feels like shakes at every state- at idle, taking off and definitely when I’m down the road- at certain speeds I can hear a metallic shimmy sound that comes and goes (wish I could explain it better). The first thing I thought when I heard it was the muffler pipes weren’t secure, but they indeed are. The other noise I have is the ever present Ford tob, but it’s exceptionally chattery in this vehicle (I say ever present, as my Ranger has always had tob chatter, and I’ve read Ford seems pretty notorious with it). But, this tob noise in particular may be a further sign of bad install.
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Old 01-03-2013, 03:12 PM   #6
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Thanks everyone for the advice. Since you were kind enough to take the time to respond, then I should do the same in return (even if I feel a bit sheepish in doing so).

So, finally got a chance to get under with a friend, drop the tranny and check out the clutch, etc. As I said before, I hadn’t machined the fly wheel the first install, wasn’t aware just how important that could be- lesson learned. I took the wheel down and had it resurfaced. Another thing I noticed, the TOB was dry. I know we greased it originally, but obviously not near enough. Pilot bearing was fine (yes, we did remember to install that originally, so got something right).

The pressure plate was scored/marked a bit, so I carefully sanded down. Got it pretty cleared up. Installed everything back up, new TOB with healthy amount of grease, shiny resurfaced fly wheel, cleaned up pressure plate, tranny back up and took her for a ride last night.

Difference was night…and…day… My gosh, clutch was a smooth as butter and shifted perfectly, no vibrations, no engine shaking, and not a peep from the TOB. I definitely learned my lessons on this. Really appreciate everyone’s input.
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Old 01-03-2013, 03:27 PM   #7
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Great to hear
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Old 01-03-2013, 03:43 PM   #8
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Nice job man always have to resurface or replace the flywheel with a new clutch or it will be no good I have a stage one and ford racing flywheel waiting to go in and I can't wait hearing that it made such a big difference for you
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