Name that Alternator Pulley - ZR-1 Net Registry Forums

-=Jeff=- · 05-07-2014

So which is which and what are they from/for??

WVZR-1 · 05-07-2014

Actually need dimensions!

Here's a link to "most" CS144 service pulley dimensions. There are others:

http://store.alternatorparts.com/cs1...r-pulleys.aspx

Here's what these people consider a replacement for the GM 10498550 that is used on the LT5. Are the dimensions correct? I've never measured one to confirm. Haven't needed one.

http://store.alternatorparts.com/sea...?find=10498550

WVZR-1 · 05-07-2014

Cliff - Using the link that I supplied the "effective" OD on your suggestion is maybe 5mm oversize and yes would require a washer. If you click on the images in that link it will show you dimensions and from where they're measured. Use any GM number in the search box and it should take you to the "considered" service pulley. Like I mentioned I've never measured since I've not had the need.

-=Jeff=- · 05-07-2014

I know my last alt had the smallest pulley I have pictured.. probably why it failed so early

so I installed an Alt last night ( got one locally) since my rebuild was installed, then a brush broke apart and took out the regulator.. I will get a good regulator for it ad get it swapped..

BUT what forgot was ow the belt goes on.. it seems impossible with the OEM size belt..

any suggestions?

-=Jeff=- · 05-07-2014

still seems next to impossible to get the belt on.. if it was 1/4 to 3/8 longer it would not be such a pain to do

WVZR-1 · 05-07-2014

Quote:

Originally Posted by -=Jeff=-

still seems next to impossible to get the belt on.. if it was 1/4 to 3/8 longer it would not be such a pain to do

That is normally not a "solution" and often can create issues. I would since the dimensions are likely quite accurate from the links I provided check the diameter of the pulley on the service alternator that you bought. Do you know that your belt is OE dimensionally? Is the manufacturers number visible still?

I was actually amazed at how easily the belt was to remove and re-install after removing it to chase a noise. That was 10 years ago so maybe that's just "poor memory" but I thought it relatively simple as compared to some.

Check your dimensions against the 10498550 which would have been an OE from GM. That number is from GMSPO alternator charts and service parts NOT after-market.

-=Jeff=- · 05-07-2014

Quote:

Originally Posted by Dynomite

If you changed alternator pulley diameter you probably need a longer serpentine belt.

I think you misunderstood.. I had a replacement Alt.. with a smaller that OEM pulley, Belt was easy on/off (like my daily drivers) swapped in a fixed replacement with the OEM pulley, belt is OEM size and it is difficult to fit the belt on.. then i remembered it being that way when I got it years ago

-=Jeff=- · 05-07-2014

Quote:

Originally Posted by WVZR-1

That is normally not a "solution" and often can create issues. I would since the dimensions are likely quite accurate from the links I provided check the diameter of the pulley on the service alternator that you bought. Do you know that your belt is OE dimensionally? Is the manufacturers number visible still?

I was actually amazed at how easily the belt was to remove and re-install after removing it to chase a noise. That was 10 years ago so maybe that's just "poor memory" but I thought it relatively simple as compared to some.

Check your dimensions against the 10498550 which would have been an OE from GM. That number is from GMSPO alternator charts and service parts NOT after-market.

number is not readable, but I always compare them when I swap and it was listed as the correct part # when I bought it..

I will check the pulley of my OEM and compare it to :
Dimensions: 21mm Belt x 62mm OD x 17mm Bore and go from there..

WVZR-1 · 05-07-2014

Quote:

Originally Posted by -=Jeff=-

number is not readable, but I always compare them when I swap and it was listed as the correct part # when I bought it..

I will check the pulley of my OEM and compare it to :
Dimensions: 21mm Belt x 62mm OD x 17mm Bore and go from there..

It might be wise since you're checking to confirm the what I call the "rear pitch" dimension from fan face to 1st groove. If that were less than the OE specification it would hint a washer like Cliff's or if it were greater than it needs rethought maybe. Either of those conditions I would think would cause aggravated belt wear.

-=Jeff=- · 05-07-2014

everything seems to be lined up.. car is running and alt has not failed yet.

I suspect the battery needs to be replaced too

05-07-2014	#1
-=Jeff=- Join Date: Jul 2007 Location: Bartlett, IL Posts: 7,169	Name that Alternator Pulley So which is which and what are they from/for?? __________________ 1990 Corvette ZR-1 #1051 Watson Headers (2" Primary) - Flowmaster Cats - Borla Catback Late Model IH - Plenum Coilovers - 4.10s Custom Interior NCM Lifetime Member #978

05-07-2014	#2
WVZR-1 Join Date: Oct 2004 Posts: 1,890	Re: Name that Alternator Pulley Actually need dimensions! Here's a link to "most" CS144 service pulley dimensions. There are others: http://store.alternatorparts.com/cs1...r-pulleys.aspx Here's what these people consider a replacement for the GM 10498550 that is used on the LT5. Are the dimensions correct? I've never measured one to confirm. Haven't needed one. http://store.alternatorparts.com/sea...?find=10498550 Last edited by WVZR-1; 05-07-2014 at 07:32 AM.

05-07-2014	#3
WVZR-1 Join Date: Oct 2004 Posts: 1,890	Re: Name that Alternator Pulley Cliff - Using the link that I supplied the "effective" OD on your suggestion is maybe 5mm oversize and yes would require a washer. If you click on the images in that link it will show you dimensions and from where they're measured. Use any GM number in the search box and it should take you to the "considered" service pulley. Like I mentioned I've never measured since I've not had the need.

05-07-2014	#4
-=Jeff=- Join Date: Jul 2007 Location: Bartlett, IL Posts: 7,169	Re: Name that Alternator Pulley I know my last alt had the smallest pulley I have pictured.. probably why it failed so early so I installed an Alt last night ( got one locally) since my rebuild was installed, then a brush broke apart and took out the regulator.. I will get a good regulator for it ad get it swapped.. BUT what forgot was ow the belt goes on.. it seems impossible with the OEM size belt.. any suggestions? __________________ 1990 Corvette ZR-1 #1051 Watson Headers (2" Primary) - Flowmaster Cats - Borla Catback Late Model IH - Plenum Coilovers - 4.10s Custom Interior NCM Lifetime Member #978

05-07-2014	#5
-=Jeff=- Join Date: Jul 2007 Location: Bartlett, IL Posts: 7,169	Re: Name that Alternator Pulley still seems next to impossible to get the belt on.. if it was 1/4 to 3/8 longer it would not be such a pain to do __________________ 1990 Corvette ZR-1 #1051 Watson Headers (2" Primary) - Flowmaster Cats - Borla Catback Late Model IH - Plenum Coilovers - 4.10s Custom Interior NCM Lifetime Member #978

05-07-2014	#10
-=Jeff=- Join Date: Jul 2007 Location: Bartlett, IL Posts: 7,169	Re: Name that Alternator Pulley everything seems to be lined up.. car is running and alt has not failed yet. I suspect the battery needs to be replaced too __________________ 1990 Corvette ZR-1 #1051 Watson Headers (2" Primary) - Flowmaster Cats - Borla Catback Late Model IH - Plenum Coilovers - 4.10s Custom Interior NCM Lifetime Member #978