Whining Gearbox/flywheel

[Links]

Hey everyone.

Just spent the day doing Stage 2 advanced driving course with Ian Luff..

After going on the skidpan and doing some 2nd gear drift/skidpan driving my car suddenly developed a whine in 1/2/3 and prob 5 gear under load..

reving it in neutral causes it to "quietly" whine.. however in 1st and 2nd as soon as you put load on it, the gearbox sounds like i'm running a dog box, very loud and quite noticable..

Some possibilities that people suggested..

"gearbox oil has been cooked"..

"issue with the thrust bearing??"..

maybe something with the flywheel - this has arrisen from it being heard when reving with the clutch out..

car doesnt' do it on deceleration, or when i'm maintaining my speed, tends to be only when the gearbox is under load..

I'm going to take it to my mechanic tomorrow - but what do people suggest, maybe get the gearbox oil changed with some redline - ASAP?

Cheers

links

[kwazza11]

sounds like it could be your mainshaft bearings giving up the ghost.

is it dead quite in 4th?

[Links]

Yeah pretty much doesn't make much noise.. nothing compared to the others..

spoke to some of the guys today at the Dyno day.. seem to have ruled out thrust bearing, and probably the main bearing..

What does it take to fix this? do I need to have the box reconditioned, or can they pull the gearbox down and replace that one bearing???

Thanks heaps for the reply.. i'm a bit worried, as it looks like i'll be paying around $1000 to get it all fixed..

Edited March 11, 2006 by Links

[RB20_ZED]

its your input shaft bearing. they are a common problem with skylines and i dont think its that big of a deal for now. i wouldnt bother replacing it coz its gonna cost a shit load to take the box out and apart. as long as you dont go giving the box a really hard time everyday it will be right. just leave it until it gets worse then get it rebuilt or replace the box. i had that problem and the box lasted fine for a long time and it seems there are lots of others out there who have this problem and drive around for a long long time before doing anything (if they do at all).

hope this helps.

-actually the only thing i would do for now is make sure u have enough oil/replace the oil in the box.

[Links]

I'm getting the oil done on tues.. i'll get some "thickener" put through it or whatever the additive is they use..

it's pretty damn loud.. ..

but I might just need to save my pennies and get it done at a later stage..

would it be better to take it to a "gearbox specialist" to find out how much and if they can isolate the issue further..

cheers Jim though.. i'll take it on board and keep people updated on how it goes..

[kwazza11]

Well i'm not sure whether the r33 boxes have the same weaknesses but i only suggested the main shaft bearing because thats exactly the symptom and cause of my old r32 box, when i stripped it down to repair it the mainshaft bearing had all of 4 balls left in the race...

Edited March 11, 2006 by kwazza11

[kwazza11]

woops double post

Edited March 11, 2006 by kwazza11

[Links]

Sorry.. thought the input shaft and main shaft bearing were the same..

I think kwazza yours sounds like the same issue as mine.. where it whines in all the gears bar 4th..

can someone please explain to me what the whine exactly is?

also - how many bearings are there..

a thrust bearing near the cluth..

an input shafter bearing located ??

a main shaft bearing located i'm guessing on the main drive shaft that the 4th gear is directly fed..

also - kwazza how hard is it to change the main shaft bearing? what breaks in it to cause the whine? ball bearing come out??

[kwazza11]

I wouldnt recommend trying it unless you have the know how as you really need to get all your synchro clearances correct and make sure everything meshes correctly otherwise you'll end up with another screwed box a month down the track..

there are quite a few bearings in a gearbox, theres the main shaft bearings and counter shaft bearings, input shaft one plus a whole collection of needle rollers for each cog.

basically mine let go due to too much lateral forces on the bearing (full load up a hill in third for alittle too long), the bearing basically melted and most of the balls popped out the back of the cage.

the arrow points to where the bearing is that let go.

IF yours has the same problem i had, the whine is caused by too much lash on the gearsets due to the shaft wobbling around.

best to get someone to check it out though, take it to someone who knows thier nissan gearboxes.

[Links]

Cheers mate..

that looks like a fair bit of work to replace that one as it's on the main shaft and dead center in the middle of the gearbox, i'm guessing they have to take almost everything off to get to it..

Next question - does anyone have someone in sydney they recommend???

Well I was doing 2nd gear skid pan work for a fair bit, which would a) generate alot of heat and b) put quite a bit of force on it, if it was letting go already that would be enough i'd say..

i'm guessing I need to get it check sooner rather than later..

[Links]

For anyone interested..

Got my gearbox pulled down today..

Looks like the thrust bearing has infact gone.. grease everywhere in the housing that shouldn't be there..

Not sure why this occured.. maybe some water splashed into it..

Whining appears to have been caused by the lip of the bearing resting on the pressure plate "fingers" and causing it to spin while I accelerate..

Once apply pressure (pushing the clutch in) it seems to go away..

Anyways - getting it all put back together tomorrow.. hopefully everything will be a-ok..

Cheers

Links

[Links]

Well $1000 later my problem is still around..

1) Thrust bearing was screwed..

2) Replaced Clutch - Thrust Bearing with a PBR RPM kit..

3) While getting fixed - a delivery ute backed into the front of my car.. now getting the bonnet redone - f**king son of a..

4) re greased my diff up - I doubt it's that..

5) I still think either a) the input shaft bearing is gone - or b) tailshaft bearing - i'm still going with a..

Anyways.. gonna see how it goes for 500k's.. see if the diff loosens up/quietens down..

anyways - thought i'd provide an update for people..

Edited April 11, 2006 by Links

[kwazza11]

Youch!

i hate hearing dodgy workshop stories like that! better off to cut your losses and go straight to a transmission/gearbox specialist, even if its just to get them to have a quick look at it, should be able to tell straight away.

and the bearings in the box will quiten down when the clutch is in as it takes the load off them and stops the input shaft spinning.

hopefully it fixes itself

Cheers

Karlos

[Links]

Thanks for the support Karlos..

Have to wait and see..

I'll probably take it to a gearbox place in the next couple of weeks after i've done some km's in it to see if it fixes itself..

Chances are I don't think it'll happen.. but we can hope..

[ferni]

How can it be your diff if you can hear it when your not moving? (You said you can hear it when you're in neutral right?)... If so can't be your diff.

When you had the gearbox apart did you notice any wear marks on any of the teeth?

If the noise doesn't happen in 4th, that says to me it has to be something to do with the bottom shaft since 4th is straight thought and doesn't put load on it...

[Links]

Yeah - sorry if I confused you ferni..

Its def not the diff - i'm aware of that.. and hence quite a bit pissed off and will have to take that up with the mechanic..

I still believe this issue is the input shaft bearing as in neutral while revving there is no load really on any of the gears as they aren't engaged.

I'm still weighing up my options - as well as cooling down a bit to re-think what it could be..

Edited April 11, 2006 by Links

[Links]

Video for anyone interested:

http://www.crankroom.com/videos/gearbox_issues_r33.wmv

[ferni]

If its the input shaft bearings, i'm pretty sure you would hear it in 4th as well???

Even if it was something to do with the gears themselves and not the bearings, you'd still hear it in neutral without load, the load of turning the gears is enough to make a noise if somethings not right....

Out of interest - can you feel any vibration through your clutch pedal if you rest your foot on it while in neutral?

Ok just listened to that video.... does sound kinda like a bearing rather than a gear, but i'm no expert and its hard to tell without hearing in person

[Links]

That's cool.. mechanic is pulling the box off again on tuesday - went up and saw him.. he's gonna pull it apart and find what the problem is.. which is schweet!

Might be something has just come out of balance - yeah I can feel a vibration - however that could be the new clutch + machined flywheel as it didnt' do that before..

Hopefully we'll be all sorted next week..

[V-Spec]

sound like front or rear baring, or layshaft float (which i doubt)

couda just got a baring and seal kit and done it

its good that they did the thrust baring as it was f**ked

keep this thread updated