Vibration- Ideas please

Includes clutch, transmission, propeller shaft,
universal joints, differential and rear axle.

Moderators: reidy, Blacky

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Harv
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Re: Vibration- Ideas please

Post by Harv »

Long shots:
a) cardboard dampener inside of driveshaft has come loose and is playing around with the balance (shouldn't be, as shafts were balanced).
b) harmonic balancer has excessive runout (that's engine though, shouldn't be as it does it coasting).

Cheers,
Harv
327 Chev EK wagon, original EK ute for Number 1 Daughter, an FB sedan meth monster project and a BB/MD grey motored FED.
62ekute
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Re: Vibration- Ideas please

Post by 62ekute »

my books says ... vibration at a particular speed is usually unis or angles ... if out of balance it increases with speed
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Brett027
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Re: Vibration- Ideas please

Post by Brett027 »

That makes sense, oh wise one😎
Sucker for a rusty bomb
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BILLY BLACKARROW
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Re: Vibration- Ideas please

Post by BILLY BLACKARROW »

This looks like a common problem Trevor -B on the fe/fc forum is having the same problem.
BILLY BLACKARROW
MY Father always said do the hard part first --because when you are OVER IT you only have the easy part left to do THINGS I HAVE TRIED TO LIVE BY
gledge
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Re: Vibration- Ideas please

Post by gledge »

Down load the TREMEC app for your pinion angles mate it is designed for checking all drive shaft angles and easy enough to use


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fraze
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Re: Vibration- Ideas please

Post by fraze »

For those of you who have been following this thread I am happy to say that I have solved the driveline vibrations. It was driveline angles! This morning I took reading of the angles of the gearbox shaft, prop. Shaft and diff pinion. I then slackened off the nuts for the rear spring / shock absorber plates, jacked up the nose of the diff to the same angle as the gearbox shaft, inserted packers (3mm in this case) at the rear side of the plates then retightened the spring plate. My dimensions are pretty crude but I ended up with the diff and gearbox at about 4 deg and the prop shaft at less than 2deg. I used my iPhone as an inclinometer and it only measures degrees, not part degrees. Any way the road test was great - no vibrations at 100 kmh! I do get a little vibration at 110 kmh but I never drive the ute at that speed so I am not bothering to chase that. All in all very satisfying. Tomorrow I will chase the same vibe issue in my FC sedan, then order proper wedges for a permanent fix. Cheers, Fraze
P.s. the guidelines published for drive line angles are: gearbox shaft and diff pinion shaft to be within 0.5 deg of each other and for the drive shaft to be less than 3 deg Angle at normal drive height.
In the Shed
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Re: Vibration- Ideas please

Post by In the Shed »

Happy days Fraze 👍
A day in the shed beats a day at work!
Orange Betty
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Re: Vibration- Ideas please

Post by Orange Betty »

Good one Fraze. These sort of posts are very educational (for me anyway) so thank you for sharing.

Dave
62 EK Sedan in slow progress
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Brett027
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Re: Vibration- Ideas please

Post by Brett027 »

Thanks for sharing the solution Fraze. Important info that helps us all.
Sucker for a rusty bomb
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Errol62
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Re: Vibration- Ideas please

Post by Errol62 »

Yep that is very good to hear Frazer


FB ute fixer upper, EK van on rotisserie
getting my FB ute on the road
EK van on rotisserie
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Harv
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Re: Vibration- Ideas please

Post by Harv »

Interesting. I wonder if all FB/EKs had this drama from the factory? I would have though an older car would have sloppy/flogged out mounts and the angles would change, but with your new mounts that should not be the case.

Cheers,
Harv
327 Chev EK wagon, original EK ute for Number 1 Daughter, an FB sedan meth monster project and a BB/MD grey motored FED.
EJVince
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Re: Vibration- Ideas please

Post by EJVince »

Fascinating topic, enjoyed reading this, glad you solved the vibration issues 👌
EK283
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Re: Vibration- Ideas please

Post by EK283 »

Hooray !!!!

The old girls were probably designed for 80kmh at the best.

Just goes to show that perseverance pays off in the end.

Greg
So many cars so little time!
EJVince
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Re: Vibration- Ideas please

Post by EJVince »

I do wonder how much the angles have changed in my EJ over the years, I really should go through this exercise and check all my angles, I think I will put it on the list, I haven't got excessive vibration but I think there could be more than there once was 🤔
FbSTDwagon
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Re: Vibration- Ideas please

Post by FbSTDwagon »

Maybe I should wedge my diff a few degrees whilst it is still in the build stage ?
Might bypass some future issues.
Drew
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