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Jul 21st, 2025 | | | | Joined: Aug 2017 Posts: 1 Moderated | | Moderated Joined: Aug 2017 Posts: 1 | My GMC 270 has what appears to be a 7/8" pulley on the crank and on the water pump. The ac delco generator has another sized pulley. As a result I am shredding belts. I am struggling to find a pulley for the generator. Any advice, contacts, links etc. would be appreciated.
| | | | | Joined: Apr 2005 Posts: 396 Shop Shark | | Shop Shark Joined: Apr 2005 Posts: 396 | 7/8 inch? That seems a bit large. Chevy's of those years have a 5/8 inch pulley at crank, water pump and generator.
Last edited by 1951Chevy1Ton; 08/10/2017 9:54 PM. Reason: spell
Jerry
| | | | | Joined: Sep 2001 Posts: 29,262 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,262 | 7/8" on my 54/55 GMC 270
I think I found one, somehow, on Rockauto.com. Someone on oldGMCtrucks.com gave me a brand and part number, I think.
That person alo suggested using a 3/4" belt as a fall-back.
I'll see if I can find that info. | | | | | Joined: Sep 2001 Posts: 29,262 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,262 | Here is the info: MPB the belt p/n is 2190637 = Napa p/n NBH2528437 $29.99, specs outside circumferenece 44.3", top width .875" With 55 amp generator p/n 2135530 = Napa p/n NBH2530467 $33.99, specs outside circumference 47.28", top width.9375. Gates TR28437 (7/8 X 44 1/4)(22mm X 1125mm) - NAPA had it Here it tis - check for it locally - Rockauto's shipping/taxes might be beatable Here are other sources. | | | | | Joined: Jun 2011 Posts: 5,096 Crusing in the Passing Lane | | Crusing in the Passing Lane Joined: Jun 2011 Posts: 5,096 | '54 GMC has 7/8 belts. Search at alternator/gen. shop for the correct pulley.
Ed
'37 GMC T-18 w/ DD 4-53T, RTO-610, 6231 aux., '95 GMC running gear, full disc brakes, power steering, 22.5 wheels and tires.
'47 GMC 1 ton w/ 302, NP-540, 4wd, full width Blazer front axle.
'54 GMC 630 w/ 503 gasser, 5 speed, ex fire truck, shortened WB 4', install 8' bed.
'55 GMC 370 w/270, 420 4 speed, grain, dump bed truck from ND. Works OK.
| | | | | Joined: Sep 2001 Posts: 29,262 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,262 | '54 GMC has 7/8 belts. Search at alternator/gen. shop for the correct pulley.
Ed belts - multiple belts? Does the correct pulley have two grooves? | | | | | Joined: Apr 2010 Posts: 232 'Bolter | | 'Bolter Joined: Apr 2010 Posts: 232 | Tom, I tried to send you a pm, but apparently you are over your topic limit.
I have a complete generator with a 7/8 pulley off a '54 302. Hasn't been tested, but looks and feels runnable. Certainly rebuildable.
6 volt I'm assuming. $50+$14 shipping. Let me know.
Roger Z.
. | | | | | Joined: Sep 2001 Posts: 29,262 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,262 | This is not the Swap Meet.
That poster has only been here once - the time he made that one post.
For good reason, he connot use the Sawp Meet until he has made a few more posts.
He could have put his email address in his profile. | | | | | Joined: Jun 2011 Posts: 5,096 Crusing in the Passing Lane | | Crusing in the Passing Lane Joined: Jun 2011 Posts: 5,096 | If one does not need them, not have to use all belts.
Ed
'37 GMC T-18 w/ DD 4-53T, RTO-610, 6231 aux., '95 GMC running gear, full disc brakes, power steering, 22.5 wheels and tires.
'47 GMC 1 ton w/ 302, NP-540, 4wd, full width Blazer front axle.
'54 GMC 630 w/ 503 gasser, 5 speed, ex fire truck, shortened WB 4', install 8' bed.
'55 GMC 370 w/270, 420 4 speed, grain, dump bed truck from ND. Works OK.
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