69 factory air
Thread Starter
ZR1TG
Joined: May 2005
Posts: 875
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From: South florida
69 factory air
Anyone have any experience with a 69 small block factory air car throwing ac belt at higher rpm (4500)
I have tried different belts. No help. Seems like the ac compressor is on a slight angle to the engine pulleys. ( very slight ) The bracket that holds the ac in place is super heavy duty , hard to imagine it could have bent ?
anyone have any similar experience with this ?
Thanks
I have tried different belts. No help. Seems like the ac compressor is on a slight angle to the engine pulleys. ( very slight ) The bracket that holds the ac in place is super heavy duty , hard to imagine it could have bent ?
anyone have any similar experience with this ?
Thanks
Team Owner
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From: Sitting in his Nowhere land Hanover Pa
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I know for mid years the water pump hub was pressed to a different dimension vs a non AC for the correct alignment
Le Mans Master
Joined: Aug 2005
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From: Temple Terrace Florida
Put a straight edge on the pulleys and sight it up and measure it carefully. If they are out of alignment enough to throw a belt, you would feel a vibration at higher RPMs. Jerry
Team Owner
Joined: Jan 2006
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From: Crossville TN
Make sure the belt is correct for the pulley/groove configuration that you have on the car. You may have the correct "V" and length, but not have one for the correct depth.
When the belt is installed, the outer surface of the belt should be about level with the O.D. of the pulley groove. If the belt is down in the groove, IT IS THE WRONG BELT; you may need one that is wider width.
You also need to be certain that the belt has proper tension on it. When new, a belt will stretch some in the first few days/weeks of use. Check it occasionally to be sure it remains tight. Adjust if necessary.
The inner [bottom] surface of all fan belts MUST NOT BE TOUCHING THE BOTTOM OF THE PULLEY GROOVE.
When the belt is installed, the outer surface of the belt should be about level with the O.D. of the pulley groove. If the belt is down in the groove, IT IS THE WRONG BELT; you may need one that is wider width.
You also need to be certain that the belt has proper tension on it. When new, a belt will stretch some in the first few days/weeks of use. Check it occasionally to be sure it remains tight. Adjust if necessary.
The inner [bottom] surface of all fan belts MUST NOT BE TOUCHING THE BOTTOM OF THE PULLEY GROOVE.
Last edited by 7T1vette; Dec 2, 2019 at 04:12 PM.
Thread Starter
ZR1TG
Joined: May 2005
Posts: 875
Likes: 235
From: South florida
cars had a different water pump pulley this could be the problem. I have owned the car less than a year and have no history . Power steering belt and pollution pump belt are much thinner. Allthough a thicker belt it seems to fit in the ac compressor perfectly but it seems to ride very high on the water pump and I believe it’s jumping at water pump .
Not sure what to do from here.
Team Owner
Joined: May 2005
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From: Huntsville AL
Didn't Corvette's come with deep groove A/C pulleys just for this reason.
And clearly all of the pulleys need to match up with regard to the size belt they are designed for.
What horse power rating is the engine?
And clearly all of the pulleys need to match up with regard to the size belt they are designed for.
What horse power rating is the engine?
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From: Sitting in his Nowhere land Hanover Pa
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I would first get all the pulley part numbers and confrime against the AIM you have the correct ones
Thread Starter
ZR1TG
Joined: May 2005
Posts: 875
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From: South florida
I do not have an aim for this corvette. Perhaps somone can let me know if this number on my pulley is correct for a 1969 small black ac / automatic car ? If it is correct then I have to suspect that the belt may be in correct ?
Team Owner
Joined: May 2005
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From: Huntsville AL
3883235 is a deep groove water pump pulley.
I was speaking about the pulley on the air conditioning compressor. The Corvettes used a deep groove a/c pulley.
You really need an AIM. This is what I can find for a 1969 Corvette with C60 air conditioning from the AIM
Pulley - Generator (Alternator) - 1949356
Pulley - Crankshaft - 3911013
Pulley - Water pump - 3876846 (narrow groove)
I suspect that you may have a pulley alignment issue
I was speaking about the pulley on the air conditioning compressor. The Corvettes used a deep groove a/c pulley.
You really need an AIM. This is what I can find for a 1969 Corvette with C60 air conditioning from the AIM
Pulley - Generator (Alternator) - 1949356
Pulley - Crankshaft - 3911013
Pulley - Water pump - 3876846 (narrow groove)
I suspect that you may have a pulley alignment issue