Working on little things, may have some questions soon - Page 2 - ZR-1 Net Registry Forums

Subfixer · 02-02-2022

The only fitment issue I had with the double row was the 1/4" spacers for the original fan shroud. They were a PITA to get in. Also, the bolts supplied are incorrect. They are sheet metal bolts vs metric threads. Solved with longer hardware store replacements. Otherwise, a direct fit.

Sent from my Pixel 4a (5G) using ZR-1 Net Registry mobile app

1991 Corvette ZR-1 · 02-06-2022

Not much of an update other than the secondary plates are off and I do not think I am going to miss them. The valves are pretty rough compared to the primaries. The screws holding the butterflies on were surprisingly easy to loosen. Some of the butterflies have seen better days. Hard to see in the picture but it has a nice thick hard carbon buildup.

1991 Corvette ZR-1 · 02-08-2022

Just doing little things until I get two key items back. One is my updated chip from Marc for the eliminated secondaries. The other is a new set of AC compressor hoses from Ecklers. Site indicated they were in stock and ordered two weeks ago but still no update on shipment. Ecklers is two or three hours from me, so an order is usually a day two delivery for me. Probably call them to see what the status is.

I am VERY tempted to attempt bearing and shaft removal, but the heads are on the engine in the car, so not sure how doable it is without messing something up. I have the PVC box gasket to replace if I removed it and the other stuff in the valley, but I have a sneaking suspicion something will go wrong. Call it paranoia. Also, my sealing surfaces between heads and injector housings is lacking.

No matter how careful I am I installing new gaskets, every time it manages to seep through and weep down the valley. Also it is seeping through into the intakes I believe so that would probably solve my oil consumption issue some. On the new set of gaskets, I will be applying a smear of permatex ultra black to both sides before everything is torqued down to spec this time.

While I wait, I decided to tackle restoring a very oily and grimy wiring harness that runs down to the remote oil housing sensors, O2 sensor and crank position sensor. I have headers, so it made things easy to gently pull out the harness for the restoration. Oh and the old overflow bottle was retired. 31 years of service. Did not realize how worn it looked until the new one showed up.

1991 Corvette ZR-1 · 02-09-2022

Anyone reseal their AC compressor? Found a reseal kit and given how grime caked my compressor was, it might be a good idea. Also, no oil drained out of the compressor. Not a drop. They even have a walkthrough detailing the reseal.

https://www.shopcenturyautoair.com/s...-10PA-SYS.html

1991 Corvette ZR-1 · 02-18-2022

Finally figured out what the mystery blue ignition coils were on my car. They are Standard brand coils. Anyone use these? I am replacing them with coils from Jerry?s while I am in here but will keep them as a back up.

https://www.oreillyauto.com/detail/c...coil/std2/dr39

For anyone that needs take these off, you need a 5.5 mm socket. Went into Autozone and they actually had one for individual purchase.

I can?t seem to find AC lines to save my life or at least verify newer 94-95 compressor lines will fit a 91 compressor and seal properly. On pictures I have seen of 94-95 compressors, there is no provision in the compressor to hold O rings. As such, the compressor lines have a recess for the rings to press into. On my 91 compressor, there is as recess for rings. My dilemma is if I purchase 94-95 lines and the rings seat in the mating surface of the lines, then I have a gap that is not properly sealed when I go to bolt them to the 91 compressor.

A helpful member showed me a picture of lines he got that were listed as 94-95 and they looked like mine but wondering if he got lucky? Can anyone confirm 90-95 compressor lines are all the same as far as mating surfaces go?

1991 Corvette ZR-1 · 02-21-2022

Rebuilt the compressor and it is back on the LT5. It was not a bad job. I went slow with it and everything worked out. Big thanks to Century Auto Air. They provide the walkthrough videos and the rebuild kit. Videos offer tips and tricks the FSM does not have. Hopefully will have the new AC compressor lines by Friday.

1991 Corvette ZR-1 · 02-24-2022

I am posting a little update with some info that hopefully someone may find useful one day should they decide to rebuild their AC system.

If you?re going through the trouble to rebuild the compressor, and it is your forever car, might be a good time to refresh some other items in the AC system. I got a set of compressor lines from these guys:

https://www.thepartsplaceinc.com/pro...10229061/63143

Although one review states they had to bend the lines some to get around the power steering pump reservoir. Mine show up tomorrow. I will update my thread with my findings as I install. The accumulators are pretty cheap at $30-$40. GDP model acquired off parts geek. The condenser I got off parts geek website was about $100. It required some bending of the tubes as it was not a direct mate up like the old condenser. But it beats paying $500 for the exact same kind from Ecklers or Zip.

I used the old shot condenser as a reference for how the new tubes would be positioned. Minimal bending required. It also comes to you pressurized. So the moment you undo a screw on plug, you?ll hear a lot of hissing. What that tells me is the condenser holds pressure. Mine sat in the parts pile for a year before I opened it up, so I feel good about the purchase so far.

Also, Bob with century auto air recommended PAG 46 oil for the compressor which should be compatible with the old R12 oil traces left after draining your compressor. I got this which has UV dye mixed in.

https://www.amazon.com/TSI-Supercool...746349&sr=8-14

Hope this helps someone in the future.

XfireZ51 · 02-24-2022

Links not working

1991 Corvette ZR-1 · 02-24-2022

Links updated so they should work now.

1991 Corvette ZR-1 · 02-25-2022

Well the fit is horrible on the new lines right out the box. I spent about 30 minutes bending the lines to negotiate around the power steering reservoir just enough to actually properly bolt up to the compressor. Once fully secured to the compressor, it was very easy to gently bend the hard lines to properly clear the power steering reservoir. Definitely not for the crowd that wants as close to factory looks as possible but it will work for me.

02-02-2022	#11
Subfixer Join Date: Sep 2018 Location: Groton, CT Posts: 393	Re: Working on little things, may have some questions soon The only fitment issue I had with the double row was the 1/4" spacers for the original fan shroud. They were a PITA to get in. Also, the bolts supplied are incorrect. They are sheet metal bolts vs metric threads. Solved with longer hardware store replacements. Otherwise, a direct fit. Sent from my Pixel 4a (5G) using ZR-1 Net Registry mobile app __________________ 1992 ZR1 #442, 2 tops, White, White, Haibeck 415, 3.90 gear, Coilovers 2021 Audi RS5, 2.9 V6 Twin Turbo, Auto, Black, Black 2021 Audi Q3, 2.0T, 8 spd Tiptronic, Navarro Blue metallic, Pearl Beige

02-06-2022	#12
1991 Corvette ZR-1 Join Date: Sep 2018 Location: Florida Posts: 305	Re: Working on little things, may have some questions soon Not much of an update other than the secondary plates are off and I do not think I am going to miss them. The valves are pretty rough compared to the primaries. The screws holding the butterflies on were surprisingly easy to loosen. Some of the butterflies have seen better days. Hard to see in the picture but it has a nice thick hard carbon buildup. Last edited by 1991 Corvette ZR-1; 02-23-2024 at 11:34 PM.

02-08-2022	#13
1991 Corvette ZR-1 Join Date: Sep 2018 Location: Florida Posts: 305	Re: Working on little things, may have some questions soon Just doing little things until I get two key items back. One is my updated chip from Marc for the eliminated secondaries. The other is a new set of AC compressor hoses from Ecklers. Site indicated they were in stock and ordered two weeks ago but still no update on shipment. Ecklers is two or three hours from me, so an order is usually a day two delivery for me. Probably call them to see what the status is. I am VERY tempted to attempt bearing and shaft removal, but the heads are on the engine in the car, so not sure how doable it is without messing something up. I have the PVC box gasket to replace if I removed it and the other stuff in the valley, but I have a sneaking suspicion something will go wrong. Call it paranoia. Also, my sealing surfaces between heads and injector housings is lacking. No matter how careful I am I installing new gaskets, every time it manages to seep through and weep down the valley. Also it is seeping through into the intakes I believe so that would probably solve my oil consumption issue some. On the new set of gaskets, I will be applying a smear of permatex ultra black to both sides before everything is torqued down to spec this time. While I wait, I decided to tackle restoring a very oily and grimy wiring harness that runs down to the remote oil housing sensors, O2 sensor and crank position sensor. I have headers, so it made things easy to gently pull out the harness for the restoration. Oh and the old overflow bottle was retired. 31 years of service. Did not realize how worn it looked until the new one showed up. Last edited by 1991 Corvette ZR-1; 02-23-2024 at 11:34 PM.

02-09-2022	#14
1991 Corvette ZR-1 Join Date: Sep 2018 Location: Florida Posts: 305	AC compressor refresh possibly? Anyone reseal their AC compressor? Found a reseal kit and given how grime caked my compressor was, it might be a good idea. Also, no oil drained out of the compressor. Not a drop. They even have a walkthrough detailing the reseal. https://www.shopcenturyautoair.com/s...-10PA-SYS.html Last edited by 1991 Corvette ZR-1; 02-23-2024 at 11:34 PM.

02-21-2022	#16
1991 Corvette ZR-1 Join Date: Sep 2018 Location: Florida Posts: 305	Re: Working on little things, may have some questions soon Rebuilt the compressor and it is back on the LT5. It was not a bad job. I went slow with it and everything worked out. Big thanks to Century Auto Air. They provide the walkthrough videos and the rebuild kit. Videos offer tips and tricks the FSM does not have. Hopefully will have the new AC compressor lines by Friday. Last edited by 1991 Corvette ZR-1; 02-23-2024 at 11:34 PM.

02-18-2022	#15
1991 Corvette ZR-1 Join Date: Sep 2018 Location: Florida Posts: 305	Finally figured out what the mystery blue ignition coils were on my car. They are Standard brand coils. Anyone use these? I am replacing them with coils from Jerry?s while I am in here but will keep them as a back up. https://www.oreillyauto.com/detail/c...coil/std2/dr39 For anyone that needs take these off, you need a 5.5 mm socket. Went into Autozone and they actually had one for individual purchase. I can?t seem to find AC lines to save my life or at least verify newer 94-95 compressor lines will fit a 91 compressor and seal properly. On pictures I have seen of 94-95 compressors, there is no provision in the compressor to hold O rings. As such, the compressor lines have a recess for the rings to press into. On my 91 compressor, there is as recess for rings. My dilemma is if I purchase 94-95 lines and the rings seat in the mating surface of the lines, then I have a gap that is not properly sealed when I go to bolt them to the 91 compressor. A helpful member showed me a picture of lines he got that were listed as 94-95 and they looked like mine but wondering if he got lucky? Can anyone confirm 90-95 compressor lines are all the same as far as mating surfaces go?

02-24-2022	#17
1991 Corvette ZR-1 Join Date: Sep 2018 Location: Florida Posts: 305	Re: Working on little things, may have some questions soon I am posting a little update with some info that hopefully someone may find useful one day should they decide to rebuild their AC system. If you?re going through the trouble to rebuild the compressor, and it is your forever car, might be a good time to refresh some other items in the AC system. I got a set of compressor lines from these guys: https://www.thepartsplaceinc.com/pro...10229061/63143 Although one review states they had to bend the lines some to get around the power steering pump reservoir. Mine show up tomorrow. I will update my thread with my findings as I install. The accumulators are pretty cheap at $30-$40. GDP model acquired off parts geek. The condenser I got off parts geek website was about $100. It required some bending of the tubes as it was not a direct mate up like the old condenser. But it beats paying $500 for the exact same kind from Ecklers or Zip. I used the old shot condenser as a reference for how the new tubes would be positioned. Minimal bending required. It also comes to you pressurized. So the moment you undo a screw on plug, you?ll hear a lot of hissing. What that tells me is the condenser holds pressure. Mine sat in the parts pile for a year before I opened it up, so I feel good about the purchase so far. Also, Bob with century auto air recommended PAG 46 oil for the compressor which should be compatible with the old R12 oil traces left after draining your compressor. I got this which has UV dye mixed in. https://www.amazon.com/TSI-Supercool...746349&sr=8-14 Hope this helps someone in the future. Last edited by 1991 Corvette ZR-1; 02-24-2022 at 07:48 PM.

02-24-2022	#18
XfireZ51 Join Date: May 2007 Location: Chicagoland, IL Posts: 9,683	Re: Working on little things, may have some questions soon Links not working

02-25-2022	#20
1991 Corvette ZR-1 Join Date: Sep 2018 Location: Florida Posts: 305	Compressor lines needed some coaxing Well the fit is horrible on the new lines right out the box. I spent about 30 minutes bending the lines to negotiate around the power steering reservoir just enough to actually properly bolt up to the compressor. Once fully secured to the compressor, it was very easy to gently bend the hard lines to properly clear the power steering reservoir. Definitely not for the crowd that wants as close to factory looks as possible but it will work for me. Last edited by 1991 Corvette ZR-1; 02-23-2024 at 11:33 PM.