Toyota Yaris Alternator nut

Channel Hopper

Suffering fools, so you don't have to.
Staff member
Joined
Jan 1, 2000
Messages
35,765
Reaction score
8,640
Points
113
Age
60
Website
www.sat-elite.uk
My Satellite Setup
A little less analogue, and a lot more crap.
My Location
UK
The other half's car came to a stop on Wednesday after the alternator (serpent) belt shed itself into the engine bay.

The cause appears to have been the alternator pulley nut unscrewing and dropping onto the road, disappearing forever. It's a T reg with airconditioning and 1 litre non-VVTi engine.

I think this is all that is needed but does anyone know what nut I should order ? Th thread looks to be about 12mm diameter, pitch unknown. There is about 14mm of thread in total and so I'm not sure whether the nut is held with a locking washer, or is one of those nylock jobbies.

I'm hoping alternators are generic and so the shaft size/composition is similar to others.

Thanks in advance
 

pgh13

Specialist Contributor
Joined
Apr 5, 2005
Messages
1,688
Reaction score
414
Points
83
Age
72
My Satellite Setup
XTrend ET8000, Dr HD 15, PC/twinhan combination. 80cm dish. GBPVR with 2 DTTV cards +hauppauge Media MVP +Raspberry Pi running XBMC
My Location
Midlands UK
I wouldn't have thought it mattered; nyloc plus plain washer or lock washer and plain nut. Is it a simple pulley or multi V type? It's a while since I had cause to get my hands dirty there, but, should there also be a woodruff key to couple the pulley to the shaft? If you have an auto electrician anywhere close he may liberate one from a scrapper for a few beer tokens
 

Captain Jack

Retired human
Joined
Oct 21, 2006
Messages
11,826
Reaction score
8,014
Points
113
My Satellite Setup
See signature
My Location
North Somerset
Is the pulley still in place/available? If so, then I'd just go with a nylock type nut with thread locking compound. If not... hmm... probably easier to buy a new alternator. Also, some alternator pulleys are clutch pulleys - means they are free to spin one way on the alternator shaft but "grabbing" it when going the other way. This is used for reducing alternator belt vibrations.
 

Channel Hopper

Suffering fools, so you don't have to.
Staff member
Joined
Jan 1, 2000
Messages
35,765
Reaction score
8,640
Points
113
Age
60
Website
www.sat-elite.uk
My Satellite Setup
A little less analogue, and a lot more crap.
My Location
UK
The pulley is there (though it was a close call), no woodruff key that I can see, just from the nut to hold her on the shaft.
 

Channel Hopper

Suffering fools, so you don't have to.
Staff member
Joined
Jan 1, 2000
Messages
35,765
Reaction score
8,640
Points
113
Age
60
Website
www.sat-elite.uk
My Satellite Setup
A little less analogue, and a lot more crap.
My Location
UK
Found a nut that fits, but only after an hour of non access (the Yaris alternator is at the rear of the engine) I found it was the wrong diameter thread.

I found another in the parts bin earlier tonight, but it took about three hours to fit, one hour to check/clean/reassemble the serpentine through the right path of the pulleys, an hour to screw in the nut on the alternator and tighten (using a drill key to lock the alternator whilst tightening the 22mm nut, then finally adding a 10mm spanner on the shaft when it became visible) and an hour to scrub off the grease.

It is probably the only nut of its type on the car and the other half managed to lose it a few hundred yards from home.
 

Channel Hopper

Suffering fools, so you don't have to.
Staff member
Joined
Jan 1, 2000
Messages
35,765
Reaction score
8,640
Points
113
Age
60
Website
www.sat-elite.uk
My Satellite Setup
A little less analogue, and a lot more crap.
My Location
UK
Back again

The nut is still on the shaft, but what happened six months ago was probably a precursor to total failure of the alternator, as its seized solid. Thenut is still on the shaft, but the pulley has been working its way around until it has worn a groove in the shaft. The other half did notice the noise but decided not to do anything about it until the battery went flat.

I've managed to get the alternator off the engine mounting points and disconnected the wiring, but I cannot fathom how to get it out from under the bonnet without disconnecting a lot of other pipes or the drive shaft on the offside, there is no cavity it can come through.

Any ideas ?
 

hairybadger

Bricoleur
Joined
Jul 20, 2012
Messages
1,412
Reaction score
784
Points
113
Location
46.1N 6.4E
My Satellite Setup
see sig
My Location
near Geneva, Haute-Savoie, France
The nut is still on the shaft, but what happened six months ago was probably a precursor to total failure of the alternator, as its seized solid. Thenut is still on the shaft, but the pulley has been working its way around until it has worn a groove in the shaft. The other half did notice the noise but decided not to do anything about it until the battery went flat.

I've managed to get the alternator off the engine mounting points and disconnected the wiring, but I cannot fathom how to get it out from under the bonnet without disconnecting a lot of other pipes or the drive shaft on the offside, there is no cavity it can come through.
I've had a bit of success recently with how-to vids on youtube (removing and cleaning EGR valve in Clio II, replacing air filter of Scenic II). Sometimes the audio is in languages I can't speak but when all you need is the pictures this isn't really a problem.

In the distant past have resorted to Haynes manuals :)
 

Channel Hopper

Suffering fools, so you don't have to.
Staff member
Joined
Jan 1, 2000
Messages
35,765
Reaction score
8,640
Points
113
Age
60
Website
www.sat-elite.uk
My Satellite Setup
A little less analogue, and a lot more crap.
My Location
UK

Channel Hopper

Suffering fools, so you don't have to.
Staff member
Joined
Jan 1, 2000
Messages
35,765
Reaction score
8,640
Points
113
Age
60
Website
www.sat-elite.uk
My Satellite Setup
A little less analogue, and a lot more crap.
My Location
UK
And, off, without taking the exhaust apart.

I'll have a go at freeing it off first as the exchange ones start at over 100 pounds.
 

Channel Hopper

Suffering fools, so you don't have to.
Staff member
Joined
Jan 1, 2000
Messages
35,765
Reaction score
8,640
Points
113
Age
60
Website
www.sat-elite.uk
My Satellite Setup
A little less analogue, and a lot more crap.
My Location
UK
Oh dear, the nut I put on the shaft last time has got so hot it has more or less welded itself onto the shaft. The pulley has been loosened underneath but has been spinning for a while (the battery in the car is virtually flat), meaning the shaft is a good couple of mm less in diameter on one section. Even if I freed off the nut there would be virtually no chance of centralising the pulley before retightening.
 

Channel Hopper

Suffering fools, so you don't have to.
Staff member
Joined
Jan 1, 2000
Messages
35,765
Reaction score
8,640
Points
113
Age
60
Website
www.sat-elite.uk
My Satellite Setup
A little less analogue, and a lot more crap.
My Location
UK
Ebayd an alternator from a dealer ooop north, arrived and fitted

About forty pounds lighter, but at least the wife is no longer ordering taxi's to the supermarket.

(squeals a bit on starting, but I'm good at ignoring her when in that sort of mood......)
 
Top