C3 Tech/Performance V8 Technical Info, Internal Engine, External Engine, Basic Tech and Maintenance for the C3 Corvette
Sponsored by:
Sponsored by:

Problem misaligned belts - 350 69'

Thread Tools
 
Search this Thread
 
Old Jul 2, 2014 | 02:47 AM
  #1  
RobyC3's Avatar
RobyC3
Thread Starter
Intermediate
10 Year Member
All Eyes On Me
 
Joined: Apr 2014
Posts: 43
Likes: 0
From: Milano Italy
Default Problem misaligned belts - 350 69'

A few weeks ago I broke a belt and has been called, but I do not like his alignment.

I am attaching photos:




The lap belt is the same as it was put in my old 80 engine, but there is something wrong!

I noticed that on AIM 80 is as follows:

(left image) (sorry I do not know why but the image is rotated)

this is the old engine where you can see the pulleys aligned:





In your opinion how do I fix it? Does anyone have the diagram of pulleys and belts ZQ3 69 '?

Tks
Roby
Reply
Old Jul 2, 2014 | 08:06 AM
  #2  
doorgunner's Avatar
doorgunner
2026 Loser of the Year
Supporting Member
10 Year Member
Veteran: Army
Photogenic
Photoriffic
 
Joined: Sep 2013
Posts: 36,582
Likes: 7,021
From: New Or-leens Loo-z-anna
Default

The waterpump pulley on the new system is different than the pulley on the old engine.....the pulley grooves in the newer system are farther from each other causing the belts to NOT LINE UP PROPERLY.
Reply
Old Jul 2, 2014 | 08:19 AM
  #3  
hugie82's Avatar
hugie82
Safety Car
15 Year Member
 
Joined: Mar 2007
Posts: 3,652
Likes: 49
From: Bridgewater nj
Default

You're not suppose to have a belt going around the water pump and power steering pump. You should have a small belt going around the middle groove on the idler pulley and the power steering pump only!!! Power steer take a lot of load on the the belt so it needs to be by itself.
Reply
Old Jul 2, 2014 | 09:32 AM
  #4  
RobyC3's Avatar
RobyC3
Thread Starter
Intermediate
10 Year Member
All Eyes On Me
 
Joined: Apr 2014
Posts: 43
Likes: 0
From: Milano Italy
Default

Perhaps the third was the air pump pulley that there has never been
Reply
Old Jul 2, 2014 | 09:34 AM
  #5  
RobyC3's Avatar
RobyC3
Thread Starter
Intermediate
10 Year Member
All Eyes On Me
 
Joined: Apr 2014
Posts: 43
Likes: 0
From: Milano Italy
Default

therefore between 69 and 80 around the pulleys did not remain unchanged?
Reply
Old Jul 2, 2014 | 11:26 AM
  #6  
Mike Ward's Avatar
Mike Ward
Race Director
10 Year Member
 
Joined: Jul 2001
Posts: 15,892
Likes: 42
Default

If you transferred the accessories and brackets from an '80 engine and put then on another engine with '69 pulleys, neither factory diagram will be applicable.

Figure out which pulleys line up with what accessories and find belts to fit.
Reply
Old Jul 2, 2014 | 11:41 AM
  #7  
RobyC3's Avatar
RobyC3
Thread Starter
Intermediate
10 Year Member
All Eyes On Me
 
Joined: Apr 2014
Posts: 43
Likes: 0
From: Milano Italy
Default

Ok, so the pulleys 80 are different from those of the 69?
I have a friend with peaks of 74 and I look the same ... but I would not be wrong ...

The engine is all new except for the intake manifold, exhaust manifold, alternator and pulleys
Reply
Old Jul 2, 2014 | 11:52 AM
  #8  
7T1vette's Avatar
7T1vette
Team Owner
15 Year Member
Community Builder
Community Influencer
Top Answer: 5
 
Joined: Jan 2006
Posts: 37,637
Likes: 3,117
From: Crossville TN
Default

1. The power steering pump absorbs maybe 1-2 hp...very low loading.

2. You want at least two belts to run on the water pump pulley; that way, you always have at least one belt working the water pump...even if the other belt breaks.

3. Normally, the rear belt runs ONLY between the crankshaft pulley and the water pump. This is the 'primary' drive belt for the water pump. [The 'secondary' belt can go to the alternator or to the power steering, if so equipped.]

4. If only the water pump pulley is misaligned, you could shim it "out" with a properly sized washer--as long as the pulley still centers on the hub pin. You may need slightly longer studs/bolts, however.

5. If the belt spacing on the present water pump pulley is wrong, you just have to replace it with a 'correct' pulley.
Reply
Corvette Stories

The Best of Corvette for Corvette Enthusiasts

story-0

8 Most "Only Corvette Owners Understand" Quirks and Problems

 Pouria Savadkouei
story-1

10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years

 Joe Kucinski
story-2

How Much Horsepower Every Corvette Engine "LOST" in 1972

 Joe Kucinski
story-3

Top 10 DOs and DON'Ts for Protecting Your Convertible Top!

 Michael S. Palmer
story-4

Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!

 Joe Kucinski
story-5

150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter

 Joe Kucinski
story-6

8 Coolest Corvette Pace Cars (and Replicas) of All Time

 Verdad Gallardo
story-7

Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)

 Joe Kucinski
story-8

Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!

 Verdad Gallardo
story-9

Top 10 Corvettes Coming to Mecum Indy 2026!

 Brett Foote
Old Jul 2, 2014 | 12:10 PM
  #9  
scottyp99's Avatar
scottyp99
Le Mans Master
15 Year Member
 
Joined: Mar 2008
Posts: 5,948
Likes: 72
From: Oxford MA-----You just lost the game!!!!
Default

It looks like the water pump pulley sticks out too far. Maybe it's a different water pump?

Scott
Reply
Old Jul 2, 2014 | 12:45 PM
  #10  
doorgunner's Avatar
doorgunner
2026 Loser of the Year
Supporting Member
10 Year Member
Veteran: Army
Photogenic
Photoriffic
 
Joined: Sep 2013
Posts: 36,582
Likes: 7,021
From: New Or-leens Loo-z-anna
Default

Maybe it is the angle of the photo........but, could you move the front belt to the middle grooves of the waterpump and crankshaft pulleys for better alignment?
Reply
Old Jul 2, 2014 | 01:20 PM
  #11  
AirborneSilva's Avatar
AirborneSilva
Melting Slicks
10 Year Member
 
Joined: Aug 2012
Posts: 3,487
Likes: 83
From: Titusville Florida
Default

Originally Posted by hugie82
You're not suppose to have a belt going around the water pump and power steering pump. You should have a small belt going around the middle groove on the idler pulley and the power steering pump only!!! Power steer take a lot of load on the the belt so it needs to be by itself.
I agree, on my 76 the power steering in running off the crank pulley only, it does not go up to the water pump pulley
Reply
Old Jul 2, 2014 | 01:26 PM
  #12  
CaseyJones's Avatar
CaseyJones
Melting Slicks
 
Joined: Jul 2010
Posts: 2,503
Likes: 33
From: McGrady NC
St. Jude Donor '15-'16
Default

The outside groove on the bottom pulley runs the PS, the inside WP and crank pulleys run the alternator, the outside groove on the WP pulley runs the AIR pump, the three remaining grooves run the A/C.
Reply
Old Jul 2, 2014 | 02:49 PM
  #13  
scottyp99's Avatar
scottyp99
Le Mans Master
15 Year Member
 
Joined: Mar 2008
Posts: 5,948
Likes: 72
From: Oxford MA-----You just lost the game!!!!
Default

Originally Posted by CaseyJones
The outside groove on the bottom pulley runs the PS, the inside WP and crank pulleys run the alternator, the outside groove on the WP pulley runs the AIR pump, the three remaining grooves run the A/C.
Yes! You can see it in the diagram. That front water pump pulley groove is there to run the air pump. Get the right belt for the power steering, and you'll be all set. It should wrap around the crank pulley and the power steering pulley, and that's it. There's a provision for tightening and loosening the belt built into the power steering pump mount. Pretty simple, once someone else points it out, huh? That's what you get for looking at the diagram upside down!

Scott

Last edited by scottyp99; Jul 2, 2014 at 02:52 PM.
Reply

Get notified of new replies

To Problem misaligned belts - 350 69'





All times are GMT -4. The time now is 12:56 PM.

story-0
8 Most "Only Corvette Owners Understand" Quirks and Problems

Slideshow: These are the quirks, annoyances, and oddly lovable problems that every Corvette owner eventually learns to live with.

By Pouria Savadkouei | 2026-05-28 09:31:39


VIEW MORE
story-1
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years

Slideshow: 10 reasons why the C6 Z06 is still a performance benchmark after 20 years.

By Joe Kucinski | 2026-05-27 17:20:09


VIEW MORE
story-2
How Much Horsepower Every Corvette Engine "LOST" in 1972

Slideshow: How much horsepower every Corvette engine lost in 1972.

By Joe Kucinski | 2026-05-27 16:54:53


VIEW MORE
story-3
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!

Slideshow: How to Protect A Convertible Top: 10 DOs & DON'Ts

By Michael S. Palmer | 2026-04-03 00:00:00


VIEW MORE
story-4
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!

Slideshow: The 10 most explosive Corvettes ever built based on power-to-weight ratio.

By Joe Kucinski | 2026-05-20 07:23:03


VIEW MORE
story-5
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter

Slideshow: From C1 to C8 we compare every Corvette generation by the numbers.

By Joe Kucinski | 2026-05-12 16:54:12


VIEW MORE
story-6
8 Coolest Corvette Pace Cars (and Replicas) of All Time

Slideshow: Some Corvette pace cars became collectible legends, while others perfectly captured the look and attitude of their era.

By Verdad Gallardo | 2026-05-11 09:50:51


VIEW MORE
story-7
Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)

Slideshow: Ranking the top 10 Corvette engines by torque output.

By Joe Kucinski | 2026-05-05 11:58:09


VIEW MORE
story-8
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!

Slideshow: A Corvette pace car nearly matching IndyCar speeds sounds exaggerated, until you look at the numbers.

By Verdad Gallardo | 2026-05-04 20:03:36


VIEW MORE
story-9
Top 10 Corvettes Coming to Mecum Indy 2026!

Among a rather large group of them.

By Brett Foote | 2026-05-04 13:56:44


VIEW MORE