big block belt blues
Thread Starter
Le Mans Master
Joined: Jul 2006
Posts: 8,117
Likes: 104
From: charlotte north carolina
big block belt blues
here's the story. big block with all after market brackets for p/s and alternator. short water pump, two groove crank pulley, two groove cast p/s pulley.
here's the problem. aim shows belt closest to engine going between the crank and w/p. no idler shown. how is this belt installed and adjusted?
next. second crank groove lines up with the outer w/p pulley, the inner p/s groove and the alternator. the outer p/s groove is forward of every other groove, but the aim shows that groove going to the alternator. it's as though the p/s pulley is one groove too far forward. do p/s pumps come in long and short as the w/pumps do?
here's the problem. aim shows belt closest to engine going between the crank and w/p. no idler shown. how is this belt installed and adjusted?
next. second crank groove lines up with the outer w/p pulley, the inner p/s groove and the alternator. the outer p/s groove is forward of every other groove, but the aim shows that groove going to the alternator. it's as though the p/s pulley is one groove too far forward. do p/s pumps come in long and short as the w/pumps do?
Le Mans Master
Joined: Oct 2006
Posts: 7,123
Likes: 433
From: Gladstone MO
C3 of Year Finalist (appearance mods) 2019
I'm not 100% on the aftermarket pulley and bracket thing, but my 69 BB (no A/C) is like this.
1. belt between the crank and water pump rear grooves. Removing the fan (easy way) or crank pulley (hard way) is the only way to remove or install that belt. the part number I have for that belt is Dayco 15325
2. Belt from crank to water pump (front grooves) to power steering pump (rear groove) is adjusted the old "move the P/S pump" way. The rear bolt on the p/s pump is a bear to get at with headers. that belt is a Dayco 15445
3. the last belt is from the p/s (front groove) to the alt and is adjusted AFTER the p/s belt. The number I have for that one is NAPA 25-08003
That's the info I have. Your numbers may vary with the differnt pulley/bracket setup..
1. belt between the crank and water pump rear grooves. Removing the fan (easy way) or crank pulley (hard way) is the only way to remove or install that belt. the part number I have for that belt is Dayco 15325
2. Belt from crank to water pump (front grooves) to power steering pump (rear groove) is adjusted the old "move the P/S pump" way. The rear bolt on the p/s pump is a bear to get at with headers. that belt is a Dayco 15445
3. the last belt is from the p/s (front groove) to the alt and is adjusted AFTER the p/s belt. The number I have for that one is NAPA 25-08003
That's the info I have. Your numbers may vary with the differnt pulley/bracket setup..
Race Director
Joined: Nov 2002
Posts: 12,142
Likes: 54
From: Taylor Michigan
All big block Vette engines use only one waterpump and its short. There is a long pump used in passenger cars and light trucks starting rouind 1970-72. I`m not sure what year they changed however. But I know for sure the 73 passenger cars has a long pump. There is a possibility a 1973 454 Chevelle pulley system will work correctly if you insist on using the passenger water pump..That places the alternator on the right side. The Vette alternator is on the left.
..
FORGET the above, I should have read and acknowledged that you have the short pump.Sorry,
..
FORGET the above, I should have read and acknowledged that you have the short pump.Sorry,
Last edited by Ironcross; Jul 11, 2008 at 06:24 PM.
Thread Starter
Le Mans Master
Joined: Jul 2006
Posts: 8,117
Likes: 104
From: charlotte north carolina
thanks for the info, but what concerns me is the apperance that the alt pulley and the forward p/s pulley will not line up. that was my question as to whether or not p/s pumps come in a long and short style.
jeff
jeff
Le Mans Master
Joined: Oct 2006
Posts: 7,123
Likes: 433
From: Gladstone MO
C3 of Year Finalist (appearance mods) 2019
there may be a couple of different p/s pulleys. mine is a cast 3 spoke type pulley. Maybe someone has some pictures. I'm in Italy right now and won't be home for a week
Drifting
Joined: Oct 2005
Posts: 1,528
Likes: 148
From: East London/SW Essex UK
On quite a few big block cars the alignment of the pulleys are poor to the alternator and ps (including my own)
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Verdad Gallardo
Safety Car
Joined: Oct 2007
Posts: 3,729
Likes: 267
From: Austin Texas
Corvette of the Year Winner 2017
2016 C3 of Year Finalist
with aftermarket brackets all pulley alignments may be different,
only way to know is ask the manufacturer.
or now you get to play the pulley aligment game.
BB p/S steering pumps are different only in respect to early and late pumps. (No short or Long)
The early pumps use the cast bolt on, 3 spoke/ 2-belt pulley.
app.1971 ????
they changed the pump to a new diameter(larger)
press on 2 belt stamped pulley.
69 with AC, Ps, PB. belt config. 3 groove pulley on crank and WP.
#1 belt close to block - goes to crank and WP only.
#2 belt in the middle goes to crank, WP, and PS
#3 belt in Front goes to crank, WP, and AC.
#4 belt goes to PS outer groove and to the Alternator.
69VETT
only way to know is ask the manufacturer.
or now you get to play the pulley aligment game.
BB p/S steering pumps are different only in respect to early and late pumps. (No short or Long)
The early pumps use the cast bolt on, 3 spoke/ 2-belt pulley.
app.1971 ????
they changed the pump to a new diameter(larger)
press on 2 belt stamped pulley.
69 with AC, Ps, PB. belt config. 3 groove pulley on crank and WP.
#1 belt close to block - goes to crank and WP only.
#2 belt in the middle goes to crank, WP, and PS
#3 belt in Front goes to crank, WP, and AC.
#4 belt goes to PS outer groove and to the Alternator.
69VETT
Safety Car
Joined: Apr 2000
Posts: 3,802
Likes: 61
From: Wichita KS
On 72 LS5 it goes like this:
#1 belt close to block - goes to crank and WP only w/idler to tighten
#2 belt in the middle goes to crank, WP, and PS
#3 belt in Front goes to WP and AC.
#4 belt goes to PS outer groove and to the Alternator.
cc
#1 belt close to block - goes to crank and WP only w/idler to tighten
#2 belt in the middle goes to crank, WP, and PS
#3 belt in Front goes to WP and AC.
#4 belt goes to PS outer groove and to the Alternator.
cc
Race Director
Joined: Nov 2002
Posts: 12,142
Likes: 54
From: Taylor Michigan
I see your still at it with the pulleys.
This discription is for my L78 1967 Camaro
Alternator is a single pulley, water pump is a double, crank is a three grove pulley, PS is a single cast iron pulley. All brackets are factory by the way. Alternator goes to the inside of the two grove W/P and around the inside crank grove.. P/S belt is on the front of the three grove crank pulley only. Outside W/P and second grove crank goes to the engine which I am not using and some call it a safty belt to keep the W/P turning..
I hope this helps Jeff..
Wally
This discription is for my L78 1967 Camaro
Alternator is a single pulley, water pump is a double, crank is a three grove pulley, PS is a single cast iron pulley. All brackets are factory by the way. Alternator goes to the inside of the two grove W/P and around the inside crank grove.. P/S belt is on the front of the three grove crank pulley only. Outside W/P and second grove crank goes to the engine which I am not using and some call it a safty belt to keep the W/P turning..
I hope this helps Jeff..
Wally
Drifting
Joined: Jul 2006
Posts: 1,871
Likes: 6
From: Sault Ste. Marie Ontario
Thread Starter
Le Mans Master
Joined: Jul 2006
Posts: 8,117
Likes: 104
From: charlotte north carolina
here's what i figured out. the outer(2 groove pulley)w/p, crank(2 groove pulley), and inner p/s grooves line up. the alt pulley is forward of all the other grooves. i believe that if i get a 3 groove w/p pulley, the alt will feed from the third groove, not from the p/s pulley as per the aim. time to call dr rebuild!
jeff
jeff
