Author Topic: Name that Vibration (Read 5731 times)

blackdiamond · « **on:** Mar 27, 2008, 08:27:55 PM »

I'm 8 days from driving the bdrunner over 1,000 miles to Moab and I'm trying to get the final bugs worked out. The t-case issues should be corrected, but I'm still looking for the source of a vibration.

Symptioms: drones in pulses from about 35 mph up, it seems to be the worst under load at the lower speeds, it seems to be reduced when not under load, can be felt at times in the steering.

I had a shop do a quick look at everything and reported no problems. I'm assuming that they checked bearings, u-joints bolt tightness etc... I confirmed that they did not check the steering arm torque which I know can cause some strange vibrations. The rear driveshaft has a little play, but nothing significant.

Any ideas?

Saturday evening I'm taking it to a friends house that is a great mechanic for another look so I'm looking for ideas.

lilbuddy · « **Reply #1 on:** Mar 27, 2008, 08:29:37 PM »

Hows the caster/alignment?

gotrocks · « **Reply #2 on:** Mar 27, 2008, 11:35:27 PM »

Check the steering arms. Mines has been fixed with that sometimes when I have a slight vib.

93tonkatoy · « **Reply #3 on:** Mar 28, 2008, 05:27:08 AM »

It all depends on where/how you feel/hear the vibration.

If you feel the vibration in the steering wheel, the problem will most likely be in the front end. If you feel it through the seat the most, then do a careful inspection on the rear. If it is more noise than "feel", I would have a very careful look at the drivelines.

any "play" in the drivelines can cause vibrations. output shaft, u-joints, pinion shaft. Also, how much axle wrap are you getting or what are your pinion angles like? An unbalanced tire will also "pulse" like you describe, and generally starting at that speed. But you will feel that through the steering wheel or the seat(front/ rear).

MiniSimp · « **Reply #4 on:** Mar 28, 2008, 06:20:39 AM »

Tires balanced?

THK Matt · « **Reply #5 on:** Mar 28, 2008, 06:24:32 AM »

not only will a non balanced tire do it.... but so will a inproperly worn tire.... [worn off camber]
man 35s not balanced and worn weird.... shakes the hell outta ya.

blackdiamond · « **Reply #6 on:** Mar 28, 2008, 07:02:42 AM »

I'm planning to get the tires balance before the trip, but I simply have not any time to do much more than work since early Feb. Nothing in the drivetrain has changed since it ran smoothly so it's possible the steering arms are not tight enough or a tire weight came off.

I did an inspection last night and I noticed that the rear mount on the lower radiator hose wasn't mounted up so I corrected that, but I'm sure that was another issue.

ToYocRawleR · « **Reply #7 on:** Mar 28, 2008, 08:13:51 AM »

sounds like a u-joint to me.

KYOTA · « **Reply #8 on:** Mar 28, 2008, 08:40:17 AM »

yokes in phase ?

unclejpl4x4 · « **Reply #9 on:** Mar 28, 2008, 08:57:33 AM »

turn off the seat vibrator

I say u-joint

blackdiamond · « **Reply #10 on:** Mar 28, 2008, 11:38:20 AM »

Quote from: KYOTA on Mar 28, 2008, 08:40:17 AM

yokes in phase ?

CV style

79coyotefrg · « **Reply #11 on:** Mar 29, 2008, 10:02:12 AM »

Quote from: blackdiamond on Mar 28, 2008, 11:38:20 AM

CV style

should still be phased to a extent

i vote bad ujoint, with a toy u joint if you can feel slack in them it needs replaced

blackdiamond · « **Reply #12 on:** Mar 30, 2008, 08:20:56 AM »

There seems to be some play in the transfer case rear output shaft/bearing, how much, if any, is normal? Should there be any play in the cv end of the driveshaft?

http://board.marlincrawler.com/index.php?topic=44075.new#new

fordh8r · « **Reply #13 on:** Mar 30, 2008, 08:38:11 AM »

Quote from: blackdiamond on Mar 30, 2008, 08:20:56 AM

There seems to be some play in the transfer case rear output shaft/bearing, how much, if any, is normal? Should there be any play in the cv end of the driveshaft?

http://board.marlincrawler.com/index.php?topic=44075.new#new

You should have pretty much none. Is the rear seal leaking? Also make sure that, If you haven't had your driveline done to fit your config of drivetrain, You also have plenty of spline engagement on the slipshaft. The less engagement you have the sloppier the driveline becomes and can cause issues. Just ask me how I know...

blackdiamond · « **Reply #14 on:** Mar 30, 2008, 11:42:40 AM »

Quote from: fordh8r on Mar 30, 2008, 08:38:11 AM

You should have pretty much none. Is the rear seal leaking? Also make sure that, If you haven't had your driveline done to fit your config of drivetrain, You also have plenty of spline engagement on the slipshaft. The less engagement you have the sloppier the driveline becomes and can cause issues. Just ask me how I know...

The rear seal seems to be fine, but I can see a slight movement in it. The differential pinion is tight and has no movement. The rear driveshaft is built for the application, but was run prior to the rear differential being rotated to correct the angles. The t-case was run with both a bent shaft for a while and two others (single and double cardan) prior to everything getting lined up properly so I'm sure the bearing has had some stress. The front t-case bearing also seems a bit loose, but it is only run a low speeds and has never been properly aligned even in the black truck so I'm not surprised about that.

blackdiamond · « **Reply #15 on:** Mar 31, 2008, 11:17:49 AM »

I got the tires balanced today and all four were off a bit. It appears that a lot of the vibration is gone, but I'm planning to replace the t-case rear main bearing tomorrow or Wednesday to eliminate all known possibilities. I pulled the drive shaft yesterday and it appears to be tight. It's getting closer...

Big Thanks to BigMike for contacting me yesterday with some information and also Jesse from High Angle for returning my call this morning and being willing to help in any way that he could.

MiniSimp · « **Reply #16 on:** Mar 31, 2008, 11:19:23 AM »

Quote from: blackdiamond on Mar 31, 2008, 11:17:49 AM

I got the tires balanced today and all four were off a bit. It appears that a lot of the vibration is gone, but I'm planning to replace the t-case rear main bearing tomorrow or Wednesday to eliminate all known possibilities. I pulled the drive shaft yesterday and it appears to be tight. It's getting closer...

Big Thanks to BigMike for contacting me yesterday with some information and also Jesse from High Angle for returning my call this morning and being willing to help in any way that he could.

Quote from: MiniSimp on Mar 28, 2008, 06:20:39 AM

Tires balanced?

blackdiamond · « **Reply #17 on:** Mar 31, 2008, 12:32:55 PM »

Quote from: MiniSimp on Mar 31, 2008, 11:19:23 AM

You done good. There is still another aspect of the vibration that still exists that I think the t-case bearing may solve. If it doesn't I'll be feeling good that it will make the trip because everything that could fall off has been checked.

Plekto · « **Reply #18 on:** Mar 31, 2008, 05:23:08 PM »

Yeah mine did that and the guy at the shop pointed out one tire's was separating like a well, like a tire giving birth through its treads.

Moral - vibrations are bad. Fix now before something breaks.

blackdiamond · « **Reply #19 on:** Apr 01, 2008, 09:56:09 PM »

T-case output bearing replaced this am.

I'm getting better with the wrenches. Toyota gave me the wrong bearing so I managed to get the correct one from a local bearing place for under $21 instead of the $68 from Toyota.

gotrocks · « **Reply #20 on:** Apr 07, 2008, 06:09:49 PM »

did it fix the vibration

blackdiamond · « **Reply #21 on:** Apr 08, 2008, 07:13:56 AM »

Yes, and No. The bearing was "loose" again in Idaho but doesn't seem to be any worse in Moab.

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