Horrible vibrations from new Solid Flywheel

[Ryno91]

Hey guys, just had a new Exedy HD clutch and solid flywheel put in, and it drives fine up until you reach 80km/h or more... then it feels like you're driving over an earthquake.. horrible vibrations right through the cabin, through the steering wheel and the seats.

Anyone else had this issue?? I'm 100% that it is coming from the flywheel because it happened the day I got it back from the mechanic.

 

[RustyNav09]

May not be balanced properly. No reason it should be anythjng else. As the driveshaft is balanced use welds. Maybe have a chat to whoever fit and see if they can tst drive and sus it out

 

[flashum1]

Flywheel vibration won't be speed related, only at certain rpm. I'd be looking at front end somewhere, but definitely something that would have been disturbed during gearbox removal. They may have loosened engine mounts to get an easier angle to remove gearbox if job was done on a hoist, that wouldn't cause such a vibration though. My thoughts would be loose front driveshaft bolts. Mine has vibration after smf but it is only under load at around 1700 rpm.

 

[tweak'e]

not sure with d40 but a thing to watch on most drive lines is the drive shafts. if they are the ones that you can slide out into two pieces, if they pull them apart and not get them back in the exact same way you can end up with horrid vibrations at certain speeds.

also check gearbox mounts.

 

[flashum1]

Tweake's on the money I reckon, out of phase front drive shaft. Used to see it on trucks after they were towed after breakdown, tow truck drivers have to remove drive shaft when trucks towed front hook to prevent any drive line damage, commonly the spline doesn't get marked and when the two pieces are put back together they can be off spline causing vibration. D40 front shaft was a prick too, bolts are hard to get to so mechanic probably split the 2 halves of the shaft thinking it'd make his job easier.

 

[Ryno91]

I am taking it back to the shop tomorrow and told them to test drive it on the motorway because it's only noticeable at higher speeds.

I get what you mean about not being speed related, but I can accelerate hard past 3k revs and not get the vibrations.. but as soon as I hit 80 km/h no matter what revs I'm doing I get the bad vibrations. It smooths out slightly as I hit 100km/h in 5th or 6th gear, but this is only a small window in which I can't notice it as much, otherwise highway driving is pretty much horrendous

 

[flashum1]

Yup drive line. Once going faster its spinning too fast to whip out from being unbalanced. Let us know what they tell you it is.

 

[Old.Tony]

Given the symptoms, I'd say driveline too. Anything from the transfer case down to the wheels (poorly balanced wheels can do the same thing).

 

[flashum1]

Heard of shock absorbers causing similar symptoms too but no reason apart from sheer coincidence here.

 

[Ryno91]

Here's an update fellas..

Mechanic tested the uni joint in the tailshaft for play, it didn't have opposing movement but it did have up and down movement, so he put a new uni joint in and went for a drive... still have the vibrations

He said he is going to drive it without the front tailshaft in to see if it that is the problem... other than that he's going to investigate it further. I'm interested to see what they come up with

 

[Ryno91]

Another update.. mechanic found the uni joint at the rear of the front tailshaft was buggered, replaced that and now the vibration has all but dissapeared!! Happy to have a properly working car before heading to Fraser this weekend

 

[flashum1]

Strange it only happened after they worked on it? Did they charge you for labour and unis?

 

[Ryno91]

Strange it only happened after they worked on it? Did they charge you for labour and unis?

Last time I take it to UltraTune, he charged me half labour but still cost me $200, he may have been covering up his mistake I don't know..

 

[Old.Tony]

It's possible that they caused the damage - to change the flywheel, you need to separate engine from gearbox and unless they pulled the engine out, they would have removed the rear drive shaft and SHOULD HAVE removed the front drive shaft. It's possible that they removed the rear, forgot that it was a 4WD, and the front drive shaft fell out and when it hit the ground, they remembered that it isn't a Toyota Corolla.

You could look on the front drive shaft for dings, but $10 says that even if he hasn't covered them up and they're there, he could find a reasonable excuse for them.

I guess that's a good reason for taking the vehicle to someone that realises that 4WD vehicles drive both ends of the car? Naturally this guy would KNOW it (especially now!) but a 4WD specialist (while they might charge you a little more) would have not made a mistake like that, and you would more safely assume that the uni failure was a coincidence rather than a mistake that's being covered up.

Of course, there's going to be 4WD specialists that make mistakes as well, I'm just betting that there's less of them than the other guys.

 

[kevvyp]

Another update.. mechanic found the uni joint at the rear of the front tailshaft was buggered, replaced that and now the vibration has all but dissapeared!! Happy to have a properly working car before heading to Fraser this weekend

Does the front drive shaft turn when in 2WD?

 

[bods]

Does the front drive shaft turn when in 2WD?

In d40s they do, the front hubs are permanently engaged, it turns the front driveshaft over all the time.

Does the d40 have a 2 piece front driveshaft or just a single one? If its a 2 piece I'd say they obviously didn't mark the alignment before removing it so when they put it back together the balance was out...


So much for road testing after changing a major drive line component...

 

[sparra04]

I would have thought the front driveshaft(from transfer case to front diff) would only turn when 4wd is selected

 

[Old.Tony]

Not in the D40s. Everything remains connected except the gearing in the transfer case. Less to break, but more effort required to turn it over.

 

[kevvyp]

In d40s they do, the front hubs are permanently engaged, it turns the front driveshaft over all the time.

Does the d40 have a 2 piece front driveshaft or just a single one? If its a 2 piece I'd say they obviously didn't mark the alignment before removing it so when they put it back together the balance was out...


So much for road testing after changing a major drive line component...

Yes of course, forgot about the fixed hubs.

 

[kwilko]

OK - I've just posted this - http://www.navara.asia/showthread.php?t=25330&highlight=vibration%2C

Vibration issue. I seem to have very similar symptoms to the OP.

now I have a language problem - what is the "front tails haft"? - Is that from transfer box to front diff?
My lot think it is the half shaft(s) which seems unlikely to me