Terrible Vibration

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Apr 14, 2010 | 04:48 PM

cowmilker08

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From: Avilla, IN

Terrible Vibration

Mt truck started vibrating bad under acceleration.
When maintaining speed for a few seconds or deccelerating it goes away.
Put your foot back in it, and it starts vibrating again.

It is in the whole truck, not just the steering wheel.
I thaught that it might be the DMF, but apparently according to Talyn auto trucks have flexplates. Which according to him are wanna-be flywheels.

So will a failing flexplate cause this vibration?
How does a flexplate work?
And what can I do to check if it is bad?

Apr 14, 2010 | 06:16 PM

RRranch

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It's probably a miss, not the flexplate. Those usually make a hell of a noise when they break that doesn't go away. Usually.
I would guess one of the top injector o rings letting go under higher pressures.

Apr 14, 2010 | 07:12 PM

cowmilker08

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From: Avilla, IN

Anyone else agree or disagree?

EDIT: I discovered some play in the rear u-joint, but i can't see that causing this bad of a vibration.
I'll fix it and see where I stand then.

Apr 14, 2010 | 07:43 PM

427 fordman

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I doubt its your flexplate. I would fix the ujoint and check the rest real close for sure. You might be surprised, that could very well be it. I would almost bet it is

Apr 14, 2010 | 08:26 PM

cowmilker08

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From: Avilla, IN

Last spring when I changed the filter and it was BLACK, plus I've been having some blue smoke on start-up, so yeah, at the least it sounds good. And hey hopefully I won't have to pull the engine.
My fiance is never going to let me forget that I swore up and down it was the DMF! LOL

Apr 15, 2010 | 12:16 PM

rideracelivemx7

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screw it, yank er out and go big or go home! LOL

Apr 15, 2010 | 12:23 PM

cowmilker08

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From: Avilla, IN

If only I had the money. LOL. School just takes too much away from me to do all the fun stuff I wish I could.

Will these work:Motorcraft Injector O-Ring Kit (set of 8) 7.3 Power Stroke DI Turbo Diesel '95-'03?
Or are there cheaper places to get Ford Motorcraft o-rings?
Are there aftermarket options that are superior to Motorcraft?

Oh and what's this I here about copper seals or o-rings or something like that?

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Apr 15, 2010 | 04:16 PM

RRranch

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From: West Texas

Check the pinion for play when you do the u joint. That could do it too. A bad u joint there can cause the pinion bearings to go out.

Apr 16, 2010 | 09:32 AM

#10

cowmilker08

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From: Avilla, IN

Quote:

Originally Posted by rideracelivemx7

Alright thanks for the help!
Also I noticed yesterday that it gets worse as the truck warms up.

Quote:

Originally Posted by RRranch

Check the pinion for play when you do the u joint. That could do it too. A bad u joint there can cause the pinion bearings to go out.

Ok. The u-joint has only been out for a couple weeks. last time I checked there was no play in it. Its not very bad. At least not as bad as the superduty that drove by my gf's house last summer that was dragging the rear driveshaft! haha, clanking down the road! He musta had the truck in 4x4.

It finally stopped raining, out to do truck work now!

Apr 16, 2010 | 08:36 PM

#11

fordpride

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From: Livoina,La

this is the orings i used from clay at least i know they are new i just don't like eBay but that me Riffraff Diesel: Alliant Injector O-rings

Apr 17, 2010 | 08:57 AM

#12

bad12jr

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From: Maysville, Kentucky

Does it do it in all gears or only when u lug it?

My IDI did something similar. I figured it out when i was going through town at about 40mph when it vibrated really bad, heard bang and saw the drive shaft rolling down the road. One of the bearings come apart on the ujoint.

Apr 17, 2010 | 09:46 PM

#13

cowmilker08

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From: Avilla, IN

Well upon replacing the u-joint yesterday (which i must add went flawlessly [didn't even scratch a knuckle] until i went to close the garage door, at which point all hell broke loose. When the pieces were done flying only three wheels held the door on the track.) the vibration ceased. So yay on that.
This is strange to me because i've had u-joints go out on the back of the driveshaft on both of my old 1987's, and they didn't vibrate like this.

But I will still be doing the o-rings soon, but nowe they can wait until i'm out of school and the crops are in the ground.

(Also some of you were concerned a few months ago that my front bumper was out of wack. So today I got her fixed up. A few hits with a sledgehammer and it looks like factory new.)