A/C Compressor replacement - ZR-1 Net Registry Forums

Bob Eyres · 11-13-2018

We’re trying to change out the original compressor on my 91” with a new one. I got a 93” unit (new) from Rockauto. That’s set up for 134, But the old manifold that bolts to it will not seal because of a different O ring configuration.
Does anyone know where I can get a new manifold/ hose Assy. that will mate the 93’ compressor with my 91’?
Or some other solution?
TIA

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jss06c6 · 11-14-2018

Bob,

Do you have your '91 compressor still? I moved the '91 "manifold" to the newer 134 compressor without issue. Can you do this?

Steve

jss06c6 · 11-14-2018

I may not be understanding the problem.. Do you have any pics? I just did this and moved my '91 manifold to my 134 compressor..

gtcollins@maxnet.co.nz · 11-14-2018

Hi I have a 1990 that do you have to do when changing from R12 to R134A
Thanks Glen

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Bob Eyres · 11-20-2018

Sorry for the delay in responding.
We managed to mate the new compressor, a Delco unit from Jerry, and it’s installed.
But a new problem cropped up. After the new serpentine belt was installed and the engine fired up there was a mismatch between the compressor pulley and the belt location. Once you revved the motor, it engaged the compressor clutch, the rear edge of the belt started to rub on the pulley. It ate about 3/16” off the edge of the belt. Misalignment sure, but why? It’s a new Denso r134 compressor, in place of the old r12 unit, with a new clutch from Rockauto.
Anyone else have this problem?

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jss06c6 · 11-20-2018

??, I took the clutch and pulley off of my R-12 compressor and put it on my R-134 compressor.. belt runs true..

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A26B · 11-20-2018

Quote:

Originally Posted by jss06c6

??, I took the clutch and pulley off of my R-12 compressor and put it on my R-134 compressor.. belt runs true..

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Yes, the alignment issue is in the hub of the clutch, not the compressor.

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A26B · 11-20-2018

Bob,
It’s not uncommon for ZR-1, LT5 (VIN J)specific parts to be listed incorrectly as sharing fitment with base engines (VIN Y). What you have is a clutch for a base engine(VIN Y). They look the same but the offset is not right for the LT5.
The problem you have is not new & has been experienced many times before.

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Bob Eyres · 11-21-2018

That’s what I was suspecting. Thanks guys I’ll be on the phone to Rockauto today

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11-13-2018	#1
Bob Eyres Join Date: Jul 2005 Location: Jupiter, Fl. Posts: 815	A/C Compressor replacement We’re trying to change out the original compressor on my 91” with a new one. I got a 93” unit (new) from Rockauto. That’s set up for 134, But the old manifold that bolts to it will not seal because of a different O ring configuration. Does anyone know where I can get a new manifold/ hose Assy. that will mate the 93’ compressor with my 91’? Or some other solution? TIA Sent from my iPhone using ZR-1 Net Registry __________________ "It's about the car, not the people." 1991 ZR-1 White/Black #1236 (Owner since 1994). Stock engine with bolt-ons: Hurst shifter,"Forced Air" intake, Coplon duct, Bee Cool Radiator, Demon coils, Jeal prom, Watson headers, X pipe, 3" B&B's, Rippie flywheel, 4:10 gears, A molds, Toyo Proxes-R888's 12.06@117mph. 1.76 60ft.

11-14-2018	#2
jss06c6 Join Date: Aug 2015 Location: Magnolia, Texas Posts: 884	Re: A/C Compressor replacement Bob, Do you have your '91 compressor still? I moved the '91 "manifold" to the newer 134 compressor without issue. Can you do this? Steve

11-14-2018	#3
jss06c6 Join Date: Aug 2015 Location: Magnolia, Texas Posts: 884	Re: A/C Compressor replacement I may not be understanding the problem.. Do you have any pics? I just did this and moved my '91 manifold to my 134 compressor..

11-14-2018	#4
gtcollins@maxnet.co.nz Join Date: Mar 2015 Location: New Zealand Posts: 385	Re: A/C Compressor replacement Hi I have a 1990 that do you have to do when changing from R12 to R134A Thanks Glen Sent from my SM-G960F using ZR-1 Net Registry mobile app

11-20-2018	#5
Bob Eyres Join Date: Jul 2005 Location: Jupiter, Fl. Posts: 815	Re: A/C Compressor replacement Sorry for the delay in responding. We managed to mate the new compressor, a Delco unit from Jerry, and it’s installed. But a new problem cropped up. After the new serpentine belt was installed and the engine fired up there was a mismatch between the compressor pulley and the belt location. Once you revved the motor, it engaged the compressor clutch, the rear edge of the belt started to rub on the pulley. It ate about 3/16” off the edge of the belt. Misalignment sure, but why? It’s a new Denso r134 compressor, in place of the old r12 unit, with a new clutch from Rockauto. Anyone else have this problem? Sent from my iPhone using ZR-1 Net Registry __________________ "It's about the car, not the people." 1991 ZR-1 White/Black #1236 (Owner since 1994). Stock engine with bolt-ons: Hurst shifter,"Forced Air" intake, Coplon duct, Bee Cool Radiator, Demon coils, Jeal prom, Watson headers, X pipe, 3" B&B's, Rippie flywheel, 4:10 gears, A molds, Toyo Proxes-R888's 12.06@117mph. 1.76 60ft.

11-20-2018	#6
jss06c6 Join Date: Aug 2015 Location: Magnolia, Texas Posts: 884	Re: A/C Compressor replacement ??, I took the clutch and pulley off of my R-12 compressor and put it on my R-134 compressor.. belt runs true.. Sent from my XT1585 using ZR-1 Net Registry mobile app

11-20-2018	#8
A26B Join Date: Dec 2003 Location: Arcadia,OK Posts: 3,394	A/C Compressor replacement Bob, It’s not uncommon for ZR-1, LT5 (VIN J)specific parts to be listed incorrectly as sharing fitment with base engines (VIN Y). What you have is a clutch for a base engine(VIN Y). They look the same but the offset is not right for the LT5. The problem you have is not new & has been experienced many times before. Sent from my iPhone using ZR-1 Net Registry __________________ Jerry Downey JERRYS LT5 GASKETS & PARTS http://www.jerrysgaskets.com 1994 *ZR-1*, Black/Black, Lingenfelter Aerobody, 416cu in, 3.91 gears, coil-over susp, Brembo brakes, etc. 2016 Black-Red, 3LT-Z51 Auto 8-speed.

11-21-2018	#9
Bob Eyres Join Date: Jul 2005 Location: Jupiter, Fl. Posts: 815	Re: A/C Compressor replacement That’s what I was suspecting. Thanks guys I’ll be on the phone to Rockauto today Sent from my iPhone using ZR-1 Net Registry __________________ "It's about the car, not the people." 1991 ZR-1 White/Black #1236 (Owner since 1994). Stock engine with bolt-ons: Hurst shifter,"Forced Air" intake, Coplon duct, Bee Cool Radiator, Demon coils, Jeal prom, Watson headers, X pipe, 3" B&B's, Rippie flywheel, 4:10 gears, A molds, Toyo Proxes-R888's 12.06@117mph. 1.76 60ft.