Corvair DiagramCorvair Photo
Corvair Center
home forum corvairs calendar links Corvair Podcast
California Corvairs
Clarks Corvair
Clarks Corvair
“CORSA"



Chevy Corvair License Plate
Chevy Corvair Chrome Wheel
Corvair Center Forum :  Corvair Center Phorum The fastest message board... ever.
Corvair Center 
Pages: 123Next
Current Page: 1 of 3
Alternator pulley nut
Posted by: American Mel ()
Date: December 22, 2017 06:16PM

Okay, so about an hour ago I decided that 32 degrees outside was cold enough to call it quits and come inside and get some advice.

I am installing my new alternator.
The beautiful picture on the F.L.A.P.S. website showed the correct alternator so I ordered it with a fair amount of confidence.
But as we have grown to expect, it arrived with the wrong pulley and not the pretty one in their picture.
So I am preparing to change that out sometime tomorrow when the temps in my carport climb back above freezing.
But, before I do that, I was wanting to make sure of the nut on there.
It is torqued fairly tight and I just wanted to verify which direction the threads run on that shaft.
I do not want to be tightening it if those things have a reverse thread or something.
I have changed out alternators many times, but have never had to change the pulley.
So, once again I call upon my Corvair brethren for a portion of your knowledge.
Thank-you in advance!

.
-----------------------------------------------
WA. state, 1 mile south of the Canadian border,
I am not at the end of the world, but you can see it from here.
'66 Monza Coupe - 4spd, 140 Daily driver beater
'67 Monza Vert. - PG, 140 Daily driver beater

Options: ReplyQuote
Re: Alternator pulley nut
Posted by: MattNall ()
Date: December 22, 2017 06:20PM

Mel, just look at the threads that are showing!! It is std. R-H threads...

Put an allen wrench in the hex... Clamp Wrench in Vice....

Use Box end wrench....and a cheater bar...





MODERATOR
Sea Mountain, between Charleston Harbor and Coos Bay! SW Oregon Coast
Click HERE for My Website...Click HERE for My TechPages!
..............................110-PG.................................................Webered-Turbo

Options: ReplyQuote
Re: Alternator pulley nut
Posted by: Lane66m ()
Date: December 22, 2017 06:53PM

I used an impactb wrench and used a my hand with a rag to holding the fan tight. It loosened up pretty quick.

Al Lane
Ellabell GA

1966 Monza Coupe, 110 hp, 4 Spd
1968 Camaro SS Coupe 350 CI 295+ HP PG
1964 Greenbrier Deluxe, 6 dr, 80 hp car engine, PG
2015 Chevrolet Malibu 2LT
2018 Chevrolet Silverado LTZ Z71 Centennial Edition
1947 Farmall A tractor 15 hp


Options: ReplyQuote
Re: Alternator pulley nut
Posted by: American Mel ()
Date: December 22, 2017 06:58PM

Thanks Matt.thumbs up
I would have/already tried, to look at the threads.winking smiley
BUT, neither my old one, nor my new one have ANY exposed threads on them.sad smiley
My blue knuckles and Raynauds was telling me that it was time to get to a warmer location anyway so it seemed like a good time to get on the forum.

.
-----------------------------------------------
WA. state, 1 mile south of the Canadian border,
I am not at the end of the world, but you can see it from here.
'66 Monza Coupe - 4spd, 140 Daily driver beater
'67 Monza Vert. - PG, 140 Daily driver beater

Options: ReplyQuote
Re: Alternator pulley nut
Posted by: American Mel ()
Date: December 22, 2017 07:04PM

Not a bad idea Al, unfortunately, I do not own an impact wench.
The single local "auto tech" owes me a favor, but his hours of operation are more unpredictable than a clock made by Lucas.eye rolling smiley

.
-----------------------------------------------
WA. state, 1 mile south of the Canadian border,
I am not at the end of the world, but you can see it from here.
'66 Monza Coupe - 4spd, 140 Daily driver beater
'67 Monza Vert. - PG, 140 Daily driver beater

Options: ReplyQuote
Re: Alternator pulley nut
Posted by: Frank DuVal ()
Date: December 22, 2017 07:20PM

Yes, as far as I have seen, all GM alternators are RH thread.

The last one I tightened I used an Allen socket on a torque wrench, holding the nut with a box end wrench. That held!thumbs up

Here is the video of what happened when I used an impact and didn't tighten it enough. Worked for a month or so...grinning smiley

[www.youtube.com]

Frank DuVal

Fredericksburg, VA

Options: ReplyQuote
Re: Alternator pulley nut
Posted by: American Mel ()
Date: December 22, 2017 07:41PM

Thanks guys!
I wasn't sure and did not want to screw it up.
Someone at work destroyed a circular saw because they just assumed that it was a normal screw and tightened the head right off of it, while trying to change the blade.
When it comes to rotational things, it doesn't hurt to ask.

.
-----------------------------------------------
WA. state, 1 mile south of the Canadian border,
I am not at the end of the world, but you can see it from here.
'66 Monza Coupe - 4spd, 140 Daily driver beater
'67 Monza Vert. - PG, 140 Daily driver beater

Options: ReplyQuote
Re: Alternator pulley nut
Posted by: Lane66m ()
Date: December 22, 2017 08:04PM

Taking off the nut was all I did. I will need to put this refurbished fan on the Greenbrier alternator in the next couple months. It has the wrong fan on it. I will install nut finger tight, then use a crowsfoot on a torque wrench to tighten nut. Shaft will be held by an Allen wrench in a 3/8 drive socket with a breaker bar for holding grip.

Al Lane
Ellabell GA

1966 Monza Coupe, 110 hp, 4 Spd
1968 Camaro SS Coupe 350 CI 295+ HP PG
1964 Greenbrier Deluxe, 6 dr, 80 hp car engine, PG
2015 Chevrolet Malibu 2LT
2018 Chevrolet Silverado LTZ Z71 Centennial Edition
1947 Farmall A tractor 15 hp


Options: ReplyQuote
Re: Alternator pulley nut
Posted by: MattNall ()
Date: December 22, 2017 08:21PM

Al best to use a Boxend..... Open end... even at right angle tends to slip off..





MODERATOR
Sea Mountain, between Charleston Harbor and Coos Bay! SW Oregon Coast
Click HERE for My Website...Click HERE for My TechPages!
..............................110-PG.................................................Webered-Turbo

Options: ReplyQuote
Re: Alternator pulley nut
Posted by: Lane66m ()
Date: December 22, 2017 08:42PM

Have to find a box end crowsfoot to fit that nut to torque it right then.

Al Lane
Ellabell GA

1966 Monza Coupe, 110 hp, 4 Spd
1968 Camaro SS Coupe 350 CI 295+ HP PG
1964 Greenbrier Deluxe, 6 dr, 80 hp car engine, PG
2015 Chevrolet Malibu 2LT
2018 Chevrolet Silverado LTZ Z71 Centennial Edition
1947 Farmall A tractor 15 hp


Options: ReplyQuote
Re: Alternator pulley nut
Posted by: 66vairman ()
Date: December 22, 2017 09:33PM

Lane66m Wrote:
-------------------------------------------------------
> Have to find a box end crowsfoot to fit that nut
> to torque it right then.

While the old Corvair generators used a LHT so they won't come loose with the Corvair reverse rotaion, ALL the alternators used a RHT (clockwise to tighten). If not properly tightened it WILL COME LOOSE. Helped a buddy with that issue last year.

The shop manual specifies a nut torque of 50-60 ft. lbs.!! You won't get that with a short allen wrench. GM had a special tool.

I do what Al does, except I use a leather welders glove to hold the fan and pulley while tightening it with an impact gun.

Options: ReplyQuote
Re: Alternator pulley nut
Posted by: MattNall ()
Date: December 22, 2017 09:46PM

66v you put the Allen wrench in a VICE....





MODERATOR
Sea Mountain, between Charleston Harbor and Coos Bay! SW Oregon Coast
Click HERE for My Website...Click HERE for My TechPages!
..............................110-PG.................................................Webered-Turbo

Options: ReplyQuote
Re: Alternator pulley nut
Posted by: Lane66m ()
Date: December 22, 2017 10:33PM

I am out driving. Anyone know what size the alternator fan nut is?

Al Lane
Ellabell GA

1966 Monza Coupe, 110 hp, 4 Spd
1968 Camaro SS Coupe 350 CI 295+ HP PG
1964 Greenbrier Deluxe, 6 dr, 80 hp car engine, PG
2015 Chevrolet Malibu 2LT
2018 Chevrolet Silverado LTZ Z71 Centennial Edition
1947 Farmall A tractor 15 hp


Options: ReplyQuote
Re: Alternator pulley nut
Posted by: MattNall ()
Date: December 22, 2017 10:37PM

I THINK 1" [ too lazy to go to garage and measure!! gg ]





MODERATOR
Sea Mountain, between Charleston Harbor and Coos Bay! SW Oregon Coast
Click HERE for My Website...Click HERE for My TechPages!
..............................110-PG.................................................Webered-Turbo

Options: ReplyQuote
Re: Alternator pulley nut
Posted by: vairmech ()
Date: December 23, 2017 04:56AM

I want to say the nut is either 15/16 or 7/8.

I always take the nut off with an impact, normal RH threads. I also always put the nut on with an impact and never had one come loose. Do you think the rebuild places torque those nuts? Not likely!

Only the very early generators had a LH thread on them.

Ken Hand
Handy Car Care
248 613 8586

Vairmech@aol.com

Options: ReplyQuote
Re: Alternator pulley nut
Posted by: azdave ()
Date: December 23, 2017 05:27AM

Just checked mine...15/16".

I got several Autozone LM alternators with free shipping to my door for $34 each a few years back. I don't mind swapping the pulleys.


Dave W. / Gilbert Arizona
66 Corsa 140 4-speed w/factory A/C
66 Corsa 140 4-speed w/factory A/C
66 Corsa 140 4-speed
65 Corsa 140 4-speed
66 Corsa 455 Toro V8
65 Monza 455 Toro V8
65 Monza 110 Convertible
65 Monza 4DR 140 PG w/factory A/C
65 Monza 4DR EJ20T w/5-speed







Edited 1 time(s). Last edit at 12/23/2017 05:29AM by azdave.

Options: ReplyQuote
Re: Alternator pulley nut
Posted by: Lane66m ()
Date: December 23, 2017 06:35AM

Thanks, Dave. I just woke up. I will check my friends tools at the hangar to see if he has that size box end or flare nut crows foot. Jus want to do it right.

Al Lane
Ellabell GA

1966 Monza Coupe, 110 hp, 4 Spd
1968 Camaro SS Coupe 350 CI 295+ HP PG
1964 Greenbrier Deluxe, 6 dr, 80 hp car engine, PG
2015 Chevrolet Malibu 2LT
2018 Chevrolet Silverado LTZ Z71 Centennial Edition
1947 Farmall A tractor 15 hp


Options: ReplyQuote
Re: Alternator pulley nut
Posted by: Frank DuVal ()
Date: December 23, 2017 09:13AM

I am real confused as to why one would want to use a crows foot for this operation. You already said you have an Allen socket. Just put that on the torque wrench and hold the 15/16 nut with a box end wrench (either combination or double box).

Why look for more tools to buy/borrow? Wait, never mind, I also buy tools that way....grinning smiley

BTW, one must also calculate the offset torque value now that the length of the torque arm is different than the values listed on the wrench!

"I also always put the nut on with an impact and never had one come loose"

Ken, I could say the same thing, until the last time!eye popping smiley So I guess I am at 95% now...

Frank DuVal

Fredericksburg, VA

Options: ReplyQuote
Re: Alternator pulley nut
Posted by: Lane66m ()
Date: December 23, 2017 09:30AM

Well, It is either buy a Craftsman $30 15/16" box end wrench to hold the nut and use the Craftsman Allen wrench mounted in a 3/8 drive socket I have or find a box end/flare nut crows foot to use to hold the nut.

One wrench $30 for one use now and maybe 3 or 4 times in next 20 years. A crows foot wrench set for one use now and maybe 3 0r 4 times in next 20 years. Oh well, maybe I'll go to HF to see how inexpensive I can get to complete the setup I need to do the task.

Now if I had a 15/16 shallow socket with wrenching flats, a cheap open crows foot would work with a torque recalculation for the 2 inch extension the cross foot puts on the torque wrench.

3 possibilities I can work on. I LOVE options and cheep methods.

Time for a beerdrinking smiley after all this thinking.smileys with beer

Al Lane
Ellabell GA

1966 Monza Coupe, 110 hp, 4 Spd
1968 Camaro SS Coupe 350 CI 295+ HP PG
1964 Greenbrier Deluxe, 6 dr, 80 hp car engine, PG
2015 Chevrolet Malibu 2LT
2018 Chevrolet Silverado LTZ Z71 Centennial Edition
1947 Farmall A tractor 15 hp


Options: ReplyQuote
Re: Alternator pulley nut
Posted by: Richard ()
Date: December 23, 2017 09:41AM

This isn't that critical and I'm surprised the book actually calls for 50-60 ft. lb. As with the other guys that use an impact, I usually just use my 18 Volt Milwaukee battery impact and it zips the nut off.
I reinstall with the same and maybe let it hammer for an extra second.
Good to go.

Options: ReplyQuote
Pages: 123Next
Current Page: 1 of 3


Sorry, only registered users may post in this forum.
This forum powered by Phorum.