alternator pulley too far back
Thread Starter
Instructor
Joined: Jun 2006
Posts: 100
Likes: 0
From: Houston Texas
alternator pulley too far back
trying to finish the 74, have to actually.
had nothing in it when bought, built it all.
have balancer on, and standard 3 groove crank pulley, looked at ones in catalogs for year vette and its the same.
problem is, my alternator sits back where the spacer is on pulley. you know the flange between where it bolts to balancer and first groove?
I have the long arm bracket and base bracket that bolts to head and it looks as if the alternator pulley is in line with the flange, not the first groove.
possiblity the alternator bracket is on wrong? I dont see how? lower bracket bolted to head, brace bolted to top water pump bolt on right side.
also having issues with powersteering pump set up, looks as if it wont adjust, brace goes to motor mount, then cradle it sits in bolts to lower block on right side.
this and a key is what is keeping it from being on the road.
need it done asap and will pay for advice, pictures, whatever. build manual not much help.
anyone in houston who wants to earn some cash helping, contact.
had nothing in it when bought, built it all.
have balancer on, and standard 3 groove crank pulley, looked at ones in catalogs for year vette and its the same.
problem is, my alternator sits back where the spacer is on pulley. you know the flange between where it bolts to balancer and first groove?
I have the long arm bracket and base bracket that bolts to head and it looks as if the alternator pulley is in line with the flange, not the first groove.
possiblity the alternator bracket is on wrong? I dont see how? lower bracket bolted to head, brace bolted to top water pump bolt on right side.
also having issues with powersteering pump set up, looks as if it wont adjust, brace goes to motor mount, then cradle it sits in bolts to lower block on right side.
this and a key is what is keeping it from being on the road.
need it done asap and will pay for advice, pictures, whatever. build manual not much help.
anyone in houston who wants to earn some cash helping, contact.
Safety Car
Joined: Oct 2000
Posts: 3,547
Likes: 12
From: Carbondale Pa.
Dunno if this will help or not but here it is anyway, the top alternator bracket, the one with the slot in it to adjust belt tension, where is it attached to the alt. in front of the "ear" or behind it, it might make a difference for you,,, then again it may not, Good luck. Peace,,,Moosie 
Thread Starter
Instructor
Joined: Jun 2006
Posts: 100
Likes: 0
From: Houston Texas
yeah the balancer is pressed on all the way, its an old style one, like 60's but it should still be the same distance out from crank when flush.
i tried the alternator on front and behind ear. neither makes much difference.
i tried the alternator on front and behind ear. neither makes much difference.
Le Mans Master
Joined: Aug 2006
Posts: 7,427
Likes: 1,560
From: mount holly NC
2025 c3 ('74-'82) of the Year Finalist - Unmodified
2019 C3 of Year Finalist (appearance mods)
Hi juniorbat, On my 74 the alternator bracket is bolted to the front of the left head with 2 bolts. The belt is on the back groove of the crank pulley and turns the water pump and the alternator.
The power steering pump bracket is bolted to the block and the adjustment is on the back of the of the same bracket. The belt goes from the front crank groove to the ps pulley. PG
The power steering pump bracket is bolted to the block and the adjustment is on the back of the of the same bracket. The belt goes from the front crank groove to the ps pulley. PG
Thread Starter
Instructor
Joined: Jun 2006
Posts: 100
Likes: 0
From: Houston Texas
I think i found the problem, I did not know corvette small blocks kept the short water pump until 82 or so. I thought all small blocks changed over in 69.
so it would explain whay my vintage air a/c brackets are for short, and all stuff wasnt lining up.
now i just need someon to sell me some cheap short pump pulleys.
this is right ? short water pump?
so it would explain whay my vintage air a/c brackets are for short, and all stuff wasnt lining up.
now i just need someon to sell me some cheap short pump pulleys.
this is right ? short water pump?
Racer
Joined: Jan 2004
Posts: 273
Likes: 0
Different alt pully
Some applications have different spaced alternator pulleys. I don't know if this applies to your scenario or not but for example, I have a 69 BB with power steering and no AC. I had a really tough time getting stuff to line up. One day, I was browsing through an Ecklers catalog, and there it was, a weird looking pulley listed for my specific application, never occured to me that it existed. Has about a 3/4 inch space between the altenator and the start of the belt groove. Puts the belt 1/16 from the radiator hose but with it in place I removed all my half *** spacers and shims and everything lined up perfectly. There are I believe several different alt pulleys for various applications. Check it out before you start pulling pumps etc as you may find what it is you need without all the headaches.
Hope this helps
-A
Hope this helps
-A
Thread Starter
Instructor
Joined: Jun 2006
Posts: 100
Likes: 0
From: Houston Texas
well if the true case is that chevy used the short pump on vettes to 82, it would make sense. the pulleys i have are off a mid year 70's camaro.
so that would explain the alternator, power steering, and the new brackets from vintage air, all being 1 inch or so too short.
new pump is 40, pulleys around 50 i guess. vintage air has pulleys for long water pump and stuff, but they are 80 a piece.
be easier and cheaper to make it all like it is supposed to be, plus no issues with belt being close to anything or hard to find matching belts.
I just want to make sure before i go get all thsi stuff that I am right, it is supposed to be a short water pump>? I saw that mentioned on a vette history page in Hot Rod archives.
wont take but 20 minutes to replace it all. nothing is on the front of the motor yet.
so that would explain the alternator, power steering, and the new brackets from vintage air, all being 1 inch or so too short.
new pump is 40, pulleys around 50 i guess. vintage air has pulleys for long water pump and stuff, but they are 80 a piece.
be easier and cheaper to make it all like it is supposed to be, plus no issues with belt being close to anything or hard to find matching belts.
I just want to make sure before i go get all thsi stuff that I am right, it is supposed to be a short water pump>? I saw that mentioned on a vette history page in Hot Rod archives.
wont take but 20 minutes to replace it all. nothing is on the front of the motor yet.
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Thread Starter
Instructor
Joined: Jun 2006
Posts: 100
Likes: 0
From: Houston Texas
Well they have one at Oreilys, I put in 74 vette with 5.7 and it came up as replacement. its 26.00. Its not a severe radical motor, so that is fine with me.
is the crank pulley supposed to be 3 or 2 groove? looking at build manual, it looks like only 2 belts are used. power steering, a/c, water pump on the outer one. alternator,crank and waterpump on inner one.
is that right?
sorry for all the questions, but i have learned, nothing is typical on these cars.
i would like to order it all today so i can get it running this week.
is the crank pulley supposed to be 3 or 2 groove? looking at build manual, it looks like only 2 belts are used. power steering, a/c, water pump on the outer one. alternator,crank and waterpump on inner one.
is that right?
sorry for all the questions, but i have learned, nothing is typical on these cars.
i would like to order it all today so i can get it running this week.
Instructor
Joined: May 2006
Posts: 221
Likes: 1
From: Albuquerque New Mexico
On my 73 the crank pulley is a three groove. One groove for water pump and alt. one for water pump and AC one for power steering pump.
There is a difference between the short the long and corvette water pumps.
The link might help you with whats wrong with buying cheep water pumps. http://www.chevyhiperformance.com/te...leys_brackets/
There is a difference between the short the long and corvette water pumps.
The link might help you with whats wrong with buying cheep water pumps. http://www.chevyhiperformance.com/te...leys_brackets/
Thread Starter
Instructor
Joined: Jun 2006
Posts: 100
Likes: 0
From: Houston Texas
will make sure i measure the shaft on the one i get. Can add spacers if need be to align the belts. But the main problem is I was assuming vettes were like most chevys and went to the long pump design. So i got pulleys and a long pump. Being out further explains why all the factory brackets I have dont put accessories in line with everything.
A little pain, but sure makes a hell of a lot more sense than trying to magically move them all forward some.
A little pain, but sure makes a hell of a lot more sense than trying to magically move them all forward some.
