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Old 03-29-2012, 09:58 AM   #1
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I am getn bad vibrations from 4 to 5 thousand rpmhave checked everything in drivetrain bur it even does it in neutral any ideas would be appreciated. A few people have said harmonic balancer. Never heard of one going bad ?
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Old 03-29-2012, 02:21 PM   #2
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I would say check
Motor mounts
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Old 03-29-2012, 02:53 PM   #3
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Re: 89 saleen

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I am getn bad vibrations from 4 to 5 thousand rpmhave checked everything in drivetrain bur it even does it in neutral any ideas would be appreciated. A few people have said harmonic balancer. Never heard of one going bad ?
Harmonic balancers can and do go bad. I have had several to fail over the years, the worst one vibrated so hard it actually cracked the snout that slides onto the crankshaft.
The inertia ring usually separates from the rubber holding it and slips which throws the balance off.


Also flywheels will sometimes crack around the mounting holes which makes them wobble and vibrate. However this issue is more prevalent on automatic transmission cars.
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Old 03-29-2012, 03:36 PM   #4
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Thanks i appreciate. It has actualy ruined a transmition from the vibration
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Old 03-29-2012, 03:41 PM   #5
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Re: 89 saleen

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Thanks i appreciate. It has actualy ruined a transmition from the vibration
What transmission auto or manual?
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Old 03-29-2012, 05:14 PM   #6
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Manual

---------- Post added at 05:14 PM ---------- Previous post was at 05:10 PM ----------

The rubber in harmonic balancer looks to b pretty bad gonna replace it tonight
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Old 03-30-2012, 01:40 AM   #7
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So put new harmonic balancer and still the same. I feal it mostly in the shifter itself Car drives good just between rhose high rpm shifter vibrates like crazy. Im wondering could the shifter itself be worn out and just vibrateing
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Old 03-30-2012, 01:57 AM   #8
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Re: 89 saleen

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So put new harmonic balancer and still the same. I feal it mostly in the shifter itself Car drives good just between rhose high rpm shifter vibrates like crazy. Im wondering could the shifter itself be worn out and just vibrateing
How does the clutch feel?
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Old 03-30-2012, 09:39 AM   #9
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The clutch feels good when i took trans out the clutch looked good replaced pilot and throwout bearing the flywheel looked good but i didnt remove it
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Old 03-30-2012, 10:42 AM   #10
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Do you have the factory driveshaft? If so they're known to vibrate at higher rpms. Is it a really bad vibration? Did u always have it or did it just start?
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Old 03-30-2012, 11:14 AM   #11
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Re: 89 saleen

I hate to say this but from what you have said:

1) Happens at 4-5 thousand
2) Even in Neutral (This actually takes everything after the flywheel out)
3) Replaced the harmonic balancer (Did not fix it)

It sounds like something in the motor or on the front. I would check the following:

1) All my Acc on the front of the motor
2) Distibutor
3) Oil pump

These are the things that would be affected while the motor is in neutral. Good luck though. I will talk to a few friends and see if I get any other ideas.
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Old 03-30-2012, 11:34 AM   #12
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It is factory driveline. Its done it sence i bought the car about a year ago It had a bad trans in when i bought when i put a new used tranny in after 6 mounths the bolt threw the side of trans back out and shift forks fell off so got another tranny and have been tryn to figure out were vibration is coming from all new brakes rotars and wheel bearings pilot and through out bearings new stearing rack ball joints and tyrods all poly urethan mounts. Have tryed a couple dif drivelines. All used factory ones tough. Dont understand. Car runs great pulls hard Im wanting to put my supercharger back on but not till i can fig out this prob. I dont feel it in pedals or anything just feels like shifter is gonna come apart at high rpms. Thank so much for all the help

---------- Post added at 11:34 AM ---------- Previous post was at 11:33 AM ----------

Also have great oil presure
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Old 03-30-2012, 12:02 PM   #13
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Was there ever internal work done to motor such as rotating assembly? Maybe it wasn't balanced right?
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Old 03-30-2012, 12:08 PM   #14
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Re: 89 saleen

What kind of Harmonic Balancer do you have? My 87 did that for a while and it was an engine balance issue. It sounds like something in the motor that is translating through the input shaft on the trans and comes out the handle. You could try something like a Fluid Dampner balancer and see if that works. Since you have tried numerous transmissions, new wheels and tires, brakes, and ball joints, that only really leaves the motor itself. I would not recomend adding the blower until you get that fixed. Try to take off the main belt and crank the car. If it still does it then all the acc are fine. Does it do it riding down the road and sitting still?
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Old 03-30-2012, 12:57 PM   #15
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No it only does it when i put my foot in it Othern than that it drive fine i can ride down the freeway at about 3 thousand rpm and rides totaly smooth. No motor work Its actualy amotor out of a 93. Do u think u could b the flywheel itself. Only thing i havent touched far as trans assembly goes

---------- Post added at 12:57 PM ---------- Previous post was at 12:56 PM ----------

I just used a stock harmonic balancer from napa auto
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Old 03-30-2012, 01:02 PM   #16
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Re: 89 saleen

Pretty sure it is not the flywheel. I would try getting a Fluid Dampner balancer first and see how that helps. Did you say that it only does it while driving it or will it do that while sitting still and in neutral?
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Old 03-30-2012, 01:05 PM   #17
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U can feel it in neutral to
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Old 03-30-2012, 01:18 PM   #18
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Re: 89 saleen

If it happens in neutral while sitting still then I would say you can cut out from the flywheel back. I would look at the front of the engine and get rid of that POS stock balancer. After you do that then let us know if it still does it. Oh yea don't forget to try taking the belt off and see if it still does it. This will eliminate all the other rotating things on the front of the motor. I would do this at home in the driveway first. It is free and easy. Just don't run the car too long like that, because the water pump is not running and that thing will get hot fast.
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Old 03-30-2012, 01:24 PM   #19
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Thanks so much
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Old 03-30-2012, 02:04 PM   #20
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Quote:
Originally Posted by onefst87
If it happens in neutral while sitting still then I would say you can cut out from the flywheel back. I would look at the front of the engine and get rid of that POS stock balancer. After you do that then let us know if it still does it. Oh yea don't forget to try taking the belt off and see if it still does it. This will eliminate all the other rotating things on the front of the motor. I would do this at home in the driveway first. It is free and easy. Just don't run the car too long like that, because the water pump is not running and that thing will get hot fast.
That's good advice,but I don't think you can totally rule out the fly wheel.if the flywheel has a crack in it it very well could make a vibration noise at high rpms.
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Old 03-30-2012, 02:34 PM   #21
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Re: 89 saleen

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That's good advice,but I don't think you can totally rule out the fly wheel.if the flywheel has a crack in it it very well could make a vibration noise at high rpms.
+1
Or if it is an aftermarket that has a bolt on weight, the weight may have came off.

A severely worn out pilot bearing could also cause vibration in the input shaft of the transmission.
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Old 03-30-2012, 02:42 PM   #22
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Re: 89 saleen

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+1
Or if it is an aftermarket that has a bolt on weight, the weight may have came off.

A severely worn out pilot bearing could also cause vibration in the input shaft of the transmission.
He said he looked at the flywheel and it did not look cracked. but that could still be a problem. I like the pilot bearing theory. If he changes the flywheel he might as well change that too. I would still start at the front since you ahve already been going through most of the back. Then I would pull the flywheel and replace it with a good one. While that is off you might as well replace the pilot bearing. You will be there anyway. This should give you engough for at least a weekend.
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Old 03-30-2012, 03:20 PM   #23
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Re: 89 saleen

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He said he looked at the flywheel and it did not look cracked. but that could still be a problem. I like the pilot bearing theory. If he changes the flywheel he might as well change that too. I would still start at the front since you ahve already been going through most of the back. Then I would pull the flywheel and replace it with a good one. While that is off you might as well replace the pilot bearing. You will be there anyway. This should give you engough for at least a weekend.
Since he has replaced the balancer and he still has the issue, it almost has to be something in the clutch area. Were it internal, something would have surely let go by now.


I also have to wonder if that engine hasn't been replaced and it has the wrong balancer and flywheel on it.
Maybe it has 28 oz imbalance internals instead of the 50 oz imbalance?
I know for a fact that will shake the crap out of them.
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Old 03-30-2012, 04:56 PM   #24
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Mine does the same thing. The shifter vibrates at high rpms. But it just does it when i'm driving.but my pinion bearing is bad in the rear.
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Old 04-01-2012, 01:19 AM   #25
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Someone had said something about marking the driveline when u remove so it doesent go back on outa time. Never heard of this
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Old 04-01-2012, 10:24 AM   #26
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Re: 89 saleen

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Someone had said something about marking the driveline when u remove so it doesent go back on outa time. Never heard of this
Yes, that is true.
If you do not and it gets installed "out of time" it will vibrate.
The cure is to remove it and turn it 180 degrees then reinstall it.
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Old 04-01-2012, 11:25 AM   #27
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Thanks again. I have only asked a few things but the answers to my ? Have all been more than answerd thanks so much for your time and input this forum kicks ***
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Old 04-01-2012, 12:03 PM   #28
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Re: 89 saleen

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Thanks again. I have only asked a few things but the answers to my ? Have all been more than answerd thanks so much for your time and input this forum kicks ***
You are welcome.
We do our best to help when we can.
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Old 04-01-2012, 10:23 PM   #29
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Ok. So i have tried everything suggested. Only thing i havent done is the flywheel so gonna pull trans and get a brand new flywheel i realy hope this does it i am so frustated
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Old 04-02-2012, 04:29 AM   #30
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Re: 89 saleen

I've put a 28oz flywheel on with 50oz upfront to see what would happen an it shaked all the time I've seen a car with a problem that at 4000 rpm can't hang on to shifter an it the bolts on pressure plate were missing an different sizes all our bolts an washers need to be same size an there
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Old 05-07-2012, 11:41 AM   #31
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So finaly got around to swaping out flywheel problem solved. Thanks for all the help
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Old 05-07-2012, 12:01 PM   #32
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Re: 89 saleen

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So finaly got around to swaping out flywheel problem solved. Thanks for all the help
Glad you got it taken care of.
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Old 05-07-2012, 12:03 PM   #33
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Awsome !!!!!!!!!
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Old 05-07-2012, 01:17 PM   #34
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Nice job working through it!
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Old 05-09-2012, 12:21 PM   #35
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Now can finaly move on to getn the blower back on
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