I remember reading about a layshaft in a box that spins.

 

My prob is on my manual gearbox is that on tickover I have a whining noise that raises in pitch with the revs.

When I press the clutch down it goes totally - this means if im sat at a set of lights or in town I have to keep my clutch down to stop the stares.....

It also whines when driving (more if I throttle off I dont notice it but under load its pretty bad)

 

Im going to replace gearbox oil this weekend (hopefully).

Do you think this will sort it?

Could it be that its low on oil or has old oil that is causing the whine?

 

Cheers

there is a metal guard under the prop. it could just be that rubbing.

Sounds like bearing failure from what you discribe.

i wouldnt think the oil change is gonna help much.

soz

daz

yeah, i was worried bout that.

Cant see it being the metal guard tbh as prop doesnt spin at standstill.

Would the bearings be a gearbox out jobbie?

 

Im soooooo hoping that its just low on oil

That will be the layshaft bearings then.

 

Thicker oil will help things a lot.

 

To change bearings it's a gearbox out job and total stripdown. IMO it's harder to strip a Z gearbox than a Z engine (I've done both in the past).

 

HTH

 

Rob.

thicker oil?

I just got some 75w/90 and some HPLS Wynns transmission treatment - thick enough you reckon?

It is quite rare for gearbox bearings to go without something else being wrong, i.e. low on oil, so I would definitely check the oil level first before taking the box out. From experience, it is usually the main shaft bearings that fail as the layshaft is situated much lower in the gearbox casing and less susceptable to wear through low oil levels. it is also fitted with roller bearings which don't so much as whine but growl when worn.