Pulley alignment problem
Thread Starter
Burning Brakes
Joined: Mar 2008
Posts: 815
Likes: 15
From: Palm City Florida
Pulley alignment problem
I'm putting an L79 together and the pulleys are not lining up. I bought the water pump and both sets of pulleys from the same vendor. They have triple checked the parts and say I have the right ones. The triple pulley on the balancer appears to be about 3/16 of an inch closer to the motor than the water pump double pulley. The balancer seems to be on correctly. From the dimensions it looks like the correct balancer. It has the number 3817173 on it. Here's the other numbers:
Inner balancer pulley: 3744043
Outer balancer pulley (add on): 3751232
Water pump pulley: 3790356CH
Water pump : 3859326
The reason for this pulley set up is to eventually have AC and PS. Are there any spacers available to line things up? Any thoughts or insight would be appreciated.
Inner balancer pulley: 3744043
Outer balancer pulley (add on): 3751232
Water pump pulley: 3790356CH
Water pump : 3859326
The reason for this pulley set up is to eventually have AC and PS. Are there any spacers available to line things up? Any thoughts or insight would be appreciated.
Le Mans Master
Joined: Jan 2005
Posts: 8,226
Likes: 2
From: Lake Wylie SC
Le Mans Master
Joined: Apr 2005
Posts: 6,350
Likes: 423
From: Seattle Area WA
Is that 3790356CH a deep, two groove water pump pulley? If its a 2 groove, it may be the problem.
The #3770245 W/P pulley is listed in my GM parts manual as applying to 63-68 327's with special high performance engines (L-79), including those with fuel injection. It is a 7-1/8" O.D., 2-deep groove pulley.
Are you sure that you have the correct balancer pulley too? I show it as being a deep, double groove pulley, p/n 3858533, but the "232" add on pulley does not work with the '533' pulley, and it isn't needed for power steering anyway. I believe the L-79 P/S pulley should be a three spoke cast iron pulley, p/n 3834720.
The #3770245 W/P pulley is listed in my GM parts manual as applying to 63-68 327's with special high performance engines (L-79), including those with fuel injection. It is a 7-1/8" O.D., 2-deep groove pulley.
Are you sure that you have the correct balancer pulley too? I show it as being a deep, double groove pulley, p/n 3858533, but the "232" add on pulley does not work with the '533' pulley, and it isn't needed for power steering anyway. I believe the L-79 P/S pulley should be a three spoke cast iron pulley, p/n 3834720.
Last edited by Scott Marzahl; Jan 7, 2009 at 12:01 PM.
Thread Starter
Burning Brakes
Joined: Mar 2008
Posts: 815
Likes: 15
From: Palm City Florida
Le Mans Master
Joined: Apr 2005
Posts: 6,350
Likes: 423
From: Seattle Area WA
If you have correct pulleys, there is no need for bubba spacers.
The guys at Long Island Corvette are pretty good when it comes to putting together a set of pulleys when you are trying to add these kind of options, give them a call and compare notes with what you have.
The guys at Long Island Corvette are pretty good when it comes to putting together a set of pulleys when you are trying to add these kind of options, give them a call and compare notes with what you have.
Last edited by Scott Marzahl; Jan 7, 2009 at 12:55 PM.
Le Mans Master
Joined: Jul 2003
Posts: 6,808
Likes: 24
From: Westport CT
I'm putting an L79 together and the pulleys are not lining up. I bought the water pump and both sets of pulleys from the same vendor. They have triple checked the parts and say I have the right ones. The triple pulley on the balancer appears to be about 3/16 of an inch closer to the motor than the water pump double pulley. The balancer seems to be on correctly. From the dimensions it looks like the correct balancer. It has the number 3817173 on it. Here's the other numbers:
Inner balancer pulley: 3744043
Outer balancer pulley (add on): 3751232
Water pump pulley: 3790356CH
Water pump : 3859326
The reason for this pulley set up is to eventually have AC and PS. Are there any spacers available to line things up? Any thoughts or insight would be appreciated.
Inner balancer pulley: 3744043
Outer balancer pulley (add on): 3751232
Water pump pulley: 3790356CH
Water pump : 3859326
The reason for this pulley set up is to eventually have AC and PS. Are there any spacers available to line things up? Any thoughts or insight would be appreciated.
STRONGLY suggest you search for a post by CF member "subfixer" on the proper mix of parts for an SHP (the L76 and L79) with PS and AC. It's very easy to get it wrong and end up with pulley misalignment issues.
Le Mans Master
Joined: Apr 2005
Posts: 6,350
Likes: 423
From: Seattle Area WA
Saved you some time, here is the post:
Yes, the water pump pulley is very close to the pump casing.
Here are the correct pulleys for a 65 L79 (350hp) with N40 (PS) and C60 (AC) from the LICS catalog. http://www.licorvette.com/catalog23.htm
Crank Pulley: Section 24 part 28E
Add-on crank pulley for PS: Section 24 part 28G
PS Pump pulley: Section 23 part 27A
Waterpump: Section 24 part 27C
Alternator pulley: Section 23 part 02G
In reference to your waterpump pulley issue, there is only one pulley that will fit correctly with PS and AC and it's not very cheap.
That's the setup I used on mine with all the accessories in their stock positions. Everything fit the way GM designed it.
Yes, the water pump pulley is very close to the pump casing.
Here are the correct pulleys for a 65 L79 (350hp) with N40 (PS) and C60 (AC) from the LICS catalog. http://www.licorvette.com/catalog23.htm
Crank Pulley: Section 24 part 28E
Add-on crank pulley for PS: Section 24 part 28G
PS Pump pulley: Section 23 part 27A
Waterpump: Section 24 part 27C
Alternator pulley: Section 23 part 02G
In reference to your waterpump pulley issue, there is only one pulley that will fit correctly with PS and AC and it's not very cheap.
That's the setup I used on mine with all the accessories in their stock positions. Everything fit the way GM designed it.
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Thread Starter
Burning Brakes
Joined: Mar 2008
Posts: 815
Likes: 15
From: Palm City Florida
Scott,
The very friendly people at Volunteer Vette cross referenced the part numbers that you supplied for LI Corvette. The parts I got from them are EN65B, EN65G, and EN60A. They think they are the same. Do you know the GM numbers? I'm stumped.
Steve
The very friendly people at Volunteer Vette cross referenced the part numbers that you supplied for LI Corvette. The parts I got from them are EN65B, EN65G, and EN60A. They think they are the same. Do you know the GM numbers? I'm stumped.
Steve
Le Mans Master
Joined: Apr 2005
Posts: 6,350
Likes: 423
From: Seattle Area WA
I believe these GM part numbers may be correct for a L79, AC and Power Steering, note that they are all entirely different from a non-A/C L-79 car. I would certainly call the Vol Vettes or LICS and discuss with them as well.
W/P- 3890419
Crank (2 groove) - 3850838
Crank (PS) - 3751232
P/S - 3770509 (Stamped steel pulley, not the cast iron one).
Alt- 3846180
W/P- 3890419
Crank (2 groove) - 3850838
Crank (PS) - 3751232
P/S - 3770509 (Stamped steel pulley, not the cast iron one).
Alt- 3846180
Thread Starter
Burning Brakes
Joined: Mar 2008
Posts: 815
Likes: 15
From: Palm City Florida
Scott,
Thanks for the GM numbers. LI Corvette is not very helpful, but Adam at Volunteer is doing some research for me. I'll pass on the GM numbers but the AIM is not very helpful and these numbers changed or were superceded from time to time making it a mystery. The more posts I read, the more confused I get. I think I've seen about 25 pulleys mentioned. Thanks again.
Steve
Thanks for the GM numbers. LI Corvette is not very helpful, but Adam at Volunteer is doing some research for me. I'll pass on the GM numbers but the AIM is not very helpful and these numbers changed or were superceded from time to time making it a mystery. The more posts I read, the more confused I get. I think I've seen about 25 pulleys mentioned. Thanks again.
Steve
POSSE ZR-1 Driver
Joined: Feb 2002
Posts: 3,980
Likes: 139
From: Groton CT
Volunteer Vette really helped with getting all the correct parts for me.
I'm looking around to see if I can find all the parts I used.
Just found my old thread.... same one Scott quoted above with the LICS numbers.
I'm looking around to see if I can find all the parts I used.
Just found my old thread.... same one Scott quoted above with the LICS numbers.
Last edited by Subfixer; Jan 8, 2009 at 07:58 PM.
Race Director
Joined: Jul 2002
Posts: 11,593
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From: Clayton NC
Thread Starter
Burning Brakes
Joined: Mar 2008
Posts: 815
Likes: 15
From: Palm City Florida
Steve
