PROPELLER SHAFT VIBRATION

**pajerokid** · April 2nd, 2003 11:19 AM

Is it true that if you remove the propeller shaft without noting or making a "mating mark", and then putting it back ng basta-basta lang, would produce vibration?

You see, my paj produces this slightly irritating LRT sound at 80kph and only at that speed. Slower or faster, wala. I would tend to suspect that my bearings are faulty, but i remember that this sound only came up after i had my crossjoints replaced. the mechanic failed to make mating marks, thus, the propeller was not replaced in the original position. I read in Haynes that this could lead to vibration. But as i recall, all propeller shafts are balanced diba?

What my other mechanic suggested was that we remove the shaft, turn it a little, replace it in a different position (with reference to previous spindle position) and then test drive. The whole process would be repeated until said vibration is gone.

comments?

**ARB** · April 2nd, 2003 01:00 PM

as far as i know the cross joint mount should be aligned on each end.

**DY3JRM** · April 2nd, 2003 01:10 PM

Pajerokid,

The answer to your question is YES. It can create vibration and noise if installed improperly. First of all, Check your cross joints if they were greased excessively. Otherwise, faulty fitting of bearing caps and errors in the selection of snap ring may result.

Also check this as stated on my factory service manual.

Front Axle Total Backlash Check
1. If the vehicle vibrates and produces a booming sound due to an imbalance in the drive system, measure the front axle total backlash by the following procedure to see if the differential carrier assembly requires removal .
a) Place the transfer control lever in the "4H" position and drive the vehicle until the 4wd indicator changes from flashing to illuminated.
b) Hold the wheels and place the transfer control lever in the "2H" position.
c) Turn the companion flange clockwise until all play is eliminated, and then align the mating mark on the differential carrier.
d) Turn the companion flange clockwise until all plat is elminated and measure the distance throuch which the mating marks moved.
LIMIT: 11mm (.43in.)

2. If the backlash exceeds the limit, remove the differential carrier assembly and final gear. Then check the differential gear meshing condition and the looseness of the drive shaft or inner splines.

Rear Axle Total Backlash Check

1. If the vehicle vibrates and produces a booming sound due to an imbalance in the drive system, measure the front axle total backlash by the following procedure to see if the differential carrier assembly requires removal .
a) Park the vehicle on a flat , level surface.
b) Place the transmission control & transfer lever to the neutral position. Then pull the parking brake lever and raise the vehicle on a jack.
c) Turn the companion flange clockwise as far as it will go. Make the mating marks on the dust cover of the companion flange and onthe diff. carrier.
d) Turn the companion flange anti-clockwise as far as it will go, and measue the distance through whichthe mating marks moved. If the backlash exceeds the limitremove the differential carrier assembly and adjust the backlash.
LIMIT: 5mm (.20in.)

RIDE ON ... 8)

**pajerokid** · April 2nd, 2003 05:43 PM

ARB::: yup, both x-joints were replaced for the rear propeller:D

DY3JRM,

excellent info man!!! thanks!!! :mrgreen:

**DY3JRM** · April 2nd, 2003 10:23 PM

Pajerokid,

Anytime pare. Basta ba pag-umuwi ako sa july eh makapag jamming tayo.

RIDE ON...

**pajerokid** · April 2nd, 2003 10:59 PM

No Problemo! :mrgreen:

**afrasay** · April 2nd, 2003 11:47 PM

di ba may guide yan? baka hindi mahigpit ang bolt and nuts or some of it.

**pajerokid** · April 4th, 2003 12:03 PM

Walang guide Alfred. The propeller shaft can be mounted onto the diff in two ways. What i did this morning was mark the old position, tapos baklas propeller shaft, then i mounted it 180 degrees (the other way). I noticed a significant reduction in my 80kph vibration problem.

Im just gonna reposition it a spline or two the next few days to totally bring the thing back to spec.

a spline a day keeps the mechanic away!

:mrgreen: :mrgreen: :mrgreen:

**ARB** · April 4th, 2003 07:54 PM

hope you try this already, aligned each end, if i could just draw it.
the c section should be aligned.

diff flange >]==prop shaft===[<trans flange

this is usually the cause of the vibrations in my trucks pag di na align pag balik ng prop shaft.
[/code]

**pajerokid** · April 4th, 2003 09:04 PM

arb:::

Sir, yung sa differential side, 2 positions lang possible. hindi na-expose yung spline nito. Whats the c section? thanks in advance! :D

**ARB** · April 4th, 2003 11:26 PM

the one that looks like a letter c at the end of the prop shaft where the cross joint is attached. they have to be the aligned with the front c which attaches to the transmission.

the C part is equals to ] and [ sa illustration. so it has to look like this if na ka kabit.

]==========[ whereas === is the prop shaft with the spline in the middle.

**ARB** · April 4th, 2003 11:47 PM

hope this link would help. look at the illustraion at the bottom.
http://www.driveshaftshop.com/angle.ivnu

**afrasay** · April 5th, 2003 01:10 AM

just like when splitting the steering rod dapat aligned yun C ng both crossjoint when installing it sa gearbox. effecto ng puyat ito.

**pajerokid** · April 8th, 2003 03:16 PM

Got it! Thanks! :wink:

**jackaroo** · April 15th, 2003 11:04 PM

pajerokid,
Some shafts have alignment marks between trans yoke and sliding joint when changing cross joints.

Had the same vibration problem on a LC100, caused by misalignment of prop shaft assembly upon installation. Check alignment by amount of "exposed shaft" on sliding joint. If too much is exposed then it may be misaligned.

**pajerokid** · April 17th, 2003 08:15 PM

Thanks sir Jackaroo :D

**pajerokid** · May 12th, 2003 11:11 AM

WHEW! Finally solved the 80kmh vibration problem. I replaced the rear propeller shaft's sleeve yoke! That was it! :D Now you have to intently listen for the vibration hum for you to hear it.

**woodfire** · May 12th, 2003 12:43 PM

good feedback! :D

**jackaroo** · May 12th, 2003 12:44 PM

Glad to hear it!
What do you think caused the problem- damaged when they replaced the crossjoints, lack of grease or just wear and tear?

**pajerokid** · May 12th, 2003 03:05 PM

I got my Paj second hand. I guess the former owner used it to pull a trailer. Bagsak kasi springs nito dati. I got the idea while reading Chilton's Mitsu Montero & Pickup repair manual. Actually i dont have a clue kung bakit nag-wear ng ganun. Upon inspection, the old yoke was looks ok, but i suspect malaki na ang kain sa spline :D

Total cost: P2681 for the yoke and 200 for labor :D

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PROPELLER SHAFT VIBRATION

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