Severe Vibrations
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Severe Vibrations
I need some help figuring out what is happening to my truck. I have a 95 Ford F150 4x4 with a 5.0, ZF 5 speed, and a 120,000 miles on the truck. In the past two weeks my water pump pully shaft broke and my viscous clutch shaft broke twice. When they break the fan spins foward and bursts the radiator.
My truck has a horrible vibration that is very prominent at any speed higher then 60 but is noticable at any speed. Looking around the site here I've found some potential problems but am not sure.
I've read that my U-Joints can be bad. I don't suspect these cause they all have been replaced and have less then 40,000 miles on the oldest ones. Plus it just got out of the driveline shop and I know they checked them. The other potential problem area is the harmonic balancer can split? I have not checked this or heard of this. What should I be looking for to check this. The vibration seems to be associated with engine speed and not highway speed.
Any help would be appreciated water pumps, radiators, and viscous clutches are getting expensive! Thanks!
My truck has a horrible vibration that is very prominent at any speed higher then 60 but is noticable at any speed. Looking around the site here I've found some potential problems but am not sure.
I've read that my U-Joints can be bad. I don't suspect these cause they all have been replaced and have less then 40,000 miles on the oldest ones. Plus it just got out of the driveline shop and I know they checked them. The other potential problem area is the harmonic balancer can split? I have not checked this or heard of this. What should I be looking for to check this. The vibration seems to be associated with engine speed and not highway speed.
Any help would be appreciated water pumps, radiators, and viscous clutches are getting expensive! Thanks!
Posting Guru
Joined: Nov 2005
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From: La Grande, OR
Yeah, if those are breaking, theres a lot of vibration, I too have heard of the balancer splitting. Try the guys over on the small block V8 performance forum, lotta guys over there that'll probably be able to help you with that information. If the vibration is associated with engine speed, yet not highway, why does it do it more over 60?
Senior User
Joined: Oct 2004
Posts: 371
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From: Wetaskiwin, Alberta
Clearly you have something that is not spinning true. If your balancer is that far out of whack you should be able to see it wobbling as the motor idles. Check all of your accessory pulleys and look for a worn or loose bearing (alt., PS pump, Water pump, AIR pump if you have one etc.). Something is shaking things up pretty badly - I hope that it is not your crankshaft.
Post back with more info as you make progress.
Cheers!
Mike
Post back with more info as you make progress.
Cheers!
Mike
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Joined: Oct 2003
Posts: 17,799
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From: Ashland City, TN
Good info MLR123.
However.
is the vibration during High rev also? or just under a load while moveing?
dont trust a U-joint just because its fairly new. I lost a drive shaft thanks to thinking.
Jack up the rear end, and block the front tires. crawl under neath and twist wiggle push and pull on the driveshaft and see whats going on.
Sounds like you have the same truck as me. But, you probably have an M5OD not a ZF, but if you do have a ZF. COOL! 302 dosn't produce enough power to wreck a M5OD.
In the end, my vibrations were from U-joints and bad pinion bearings.
start your truck, and have sombody watch the engine while you rev it up, to see how it moves. Or have them rev for you.
Load check it the same way. put it in gear and brake torque it a little to see how much the engine is moveing around.
Watch your pullies and see if they are wobbleing.
However.
is the vibration during High rev also? or just under a load while moveing?
dont trust a U-joint just because its fairly new. I lost a drive shaft thanks to thinking.
Jack up the rear end, and block the front tires. crawl under neath and twist wiggle push and pull on the driveshaft and see whats going on.
Sounds like you have the same truck as me. But, you probably have an M5OD not a ZF, but if you do have a ZF. COOL! 302 dosn't produce enough power to wreck a M5OD.
In the end, my vibrations were from U-joints and bad pinion bearings.
start your truck, and have sombody watch the engine while you rev it up, to see how it moves. Or have them rev for you.
Load check it the same way. put it in gear and brake torque it a little to see how much the engine is moveing around.
Watch your pullies and see if they are wobbleing.
Elder User
Joined: Jun 2006
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Originally Posted by Talyn
COOL! 302 dosn't produce enough power to wreck a M5OD.
I can attribute the destruction to road rage and wheel hop (my own doing) when some little rice burner cuts me off or some broad is doing her make-up and plows into the step bumper with her Volvo. Volvos may be tough, but the rear bumper of an F-150 is apparently tougher. Now, if I can just find the Jaguar driver that ran me off the road in my Taurus ......
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Stupid U Joints
I checked the U joints again and sure enough they are worn. I can't believe they are bad because they were replaced only 3 years ago. I haven't driven that much considering the first set went 7 years. Thanks for the help.
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O one more thing, I do have a ZF5 transmission. The M5OD pooped out several years ago so I picked a ZF up from a junkyard.
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Junior User
Joined: Sep 2006
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From: Longmont, Colorado
If the vibration lessens but does not go away, you may want to check your throwout bearing. Mine was bad and caused the slave cylinder to go out. I had some other issues to though.
<a href="https://www.ford-trucks.com/forums/587799-heck-of-a-weekend.html">Click Here</a> To see what happened to mine.
<a href="https://www.ford-trucks.com/forums/587799-heck-of-a-weekend.html">Click Here</a> To see what happened to mine.