fc tii rumbling/violent shifter vibration at high engine speeds. NEED HELP!
02-13-11, 11:50 AM
#27
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It's definately NOT bad u-joints. That will be a clanking or vibration at speed, but only above a certain speed.
It has nothing to do with the trans because it still does it when you have the clutch pressed in. The vibration is just being carried through the housing. It's worse in gear because the vibration is then being carried through the trans.
I'd say it's flywheel forawrd. Did you swap the flywheel when you put the engine in?
If you have a lightweight flywheel you could have the wrong counterweight.
Pop your belts off and check the WP as suggested. Start the car and rev it with all the belts off, and the fan off, it should run on just the battery.
Don't let it run for more than a few minuets though, it will be getting no cooling. That will at least let you check a few things off of your list.
It has nothing to do with the trans because it still does it when you have the clutch pressed in. The vibration is just being carried through the housing. It's worse in gear because the vibration is then being carried through the trans.
I'd say it's flywheel forawrd. Did you swap the flywheel when you put the engine in?
If you have a lightweight flywheel you could have the wrong counterweight.
Pop your belts off and check the WP as suggested. Start the car and rev it with all the belts off, and the fan off, it should run on just the battery.
Don't let it run for more than a few minuets though, it will be getting no cooling. That will at least let you check a few things off of your list.
02-13-11, 01:00 PM
#28
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Does this car have a t2 motor with an NA trans? If so someone might have used the NA flywheel on the T2 engine witch wont work and will vibrate. We need more info on the swap. Some say they have a "complete" swap and dont have the complete T2 driveline.
02-13-11, 01:35 PM
#29
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i saw the motor and drivetrain when it was off the car and sold it to someone just recently with the gxl diff. from what i was told was that the motor was recently rebuilt and streetported. i saw the video of it in the donor car before the swap and he rev'd it to redline a couple times and it looked/sounded good. it rev'd smooth all the way with no abnormal sounds and shaking. after the swap then that is when i noticed this problem. maybe something wasn't tightened down? ill have the waterpump checked on monday with all the mounts on the car and the flywheel. i think that would be a good start to diagnose that. ill keep ya posted and let you know what happened
02-13-11, 06:11 PM
#30
i would personally tear everything off the front of the engine, try it with nothing on the front of the crank, if it still shakes, id say something involving the rotating assemby. if no shake, add the pullies, if nothing, add etc......
see what im saying, start eliminating things
Lloyd
see what im saying, start eliminating things
Lloyd
02-13-11, 06:15 PM
#31
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here is the video of me reving in neutral to redline a couple times. (at this time i was still getting the shifter vibration/rumbling from the cockpit. let me know if you can hear or see anything unusual and might be able to know what it is by looking/hearing it. thanks. but i agree i think taking it apart and slowly putting it back together will make the most sense on figuring what the problem is... but the only problem with that is that i am not mechanically skillfull LOL. here is the vid. thanks again
http://www.youtube.com/watch?v=G0Yp-LiHCeQ
http://www.youtube.com/watch?v=G0Yp-LiHCeQ
02-14-11, 12:42 PM
#34
Yes you can see the fan vibrate. take the fan off and free rev it a few times. dont forget to put bolts or nuts back on the pully when you take the fan off. And do not over heat it. Just take the fan off. do what you just did in the vid. and report back.
02-14-11, 01:59 PM
#36
it would be awesome if the video was stationary in one spot and not moving around. My video idea was awesome. But thats cool, like others suggested, try taking off your fan and run it without it to see if it still happens. Just watch your engine temps though so you dont overheat.. If it clears up, then replace it.
02-14-11, 03:58 PM
#38
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coool guys you all have good eyes. ill check that out along with the WP when i get the chance on my day off fri/sat. i hope this is the problem. i will report back as soon as i can
02-16-11, 01:49 PM
#39
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i guess that is where ill start. now planning to be upgrading the rad and waterpump and replacing the fan clutch first. hopefully this fixes the problem. the motor mounts lseem to be working fine since the motor is not moving heavily during high revs and i guess after, if the problem still persists, i can round it down to a flywheel problem since you guys say. but does anyone have an explanation on why the shifter would vibrate like it does with the seized clutch fan or bad waterpump? i havnt ever read up on problems with those parts the cause the symptoms that i have other than overheating the motor(which my car doesnt overheat at this time).....???
02-18-11, 06:44 PM
#42
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sorry i havnt been able to take a look at my car cuz ive been busy working the passed 4 days straight and with the GF alot. well anyways, brought my car to my shop. they are fixing it right now. and you guys were right, it was a bad fan clutch. it would wobble violently at high RPM's causing a chain reaction of vibration down to the drivetrain. the fan clutch had a bad bearing. and the fan would be loose. didnt notice this when motor was cold but when car was warmed up and turned off, the fan was loose when free spun. he is replacing it right now hopefully this fixes the problem. also he said the waterpump looks visually okay. ill keep you guys updated when i get my car back tomorrow
02-18-11, 08:54 PM
#43
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got the good news! the vibration is officially gone. the culprit was the fan clutch as mentioned. thanks to everyone who was concerned and stopped by to put in their 2 cents for me in this thread. you were all very helpful. you guys definitely saved me a lot of money 
Also thanks to J.T.P. for doing the work and just being a darn cool guy. ALWAYS GIVES QUALITY WORK , thanks homie.
Also thanks to J.T.P. for doing the work and just being a darn cool guy. ALWAYS GIVES QUALITY WORK , thanks homie.
