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#1 |
Join Date: Oct 2022
Location: california
Posts: 4
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Looks like I have the flickering lights, bouncing amp meter gauge syndrome. I did a test on the alternator and it appears to be bad. I just R/R'ed the plenum for a tuneup and replacement of some bad injectors. The plenum has been on only one week. Would I need to get new plenum gaskets, again? or can I carefully lift the plenum, do the alternator swap and reuse the gaskets? Any recommendations on Alternators or should I try to rebuild it and the voltage regulator?
Thanks. |
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#2 | |
![]() Join Date: Aug 2006
Location: McLean, VA
Posts: 3,712
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Actually, if you are careful, you can reuse the plenum gasket multiple times. I typically use Gasgacinch on the side attached to the plenum so that the gasket stays attached to the plenum. If a piece gets broken off, use a dab of Crazy glue and touch of silicone sealant at joints to keep good seal. As for the alternator, I would prefer locating a good rebuilder locally and as for a rebuild along with increase in amperage to 140. Mae sure they are using US, Korean, or Taiwanese parts. No Chinese parts. Before taking the alternator out, make sure all connections were done right. |
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#3 |
![]() Join Date: Jul 2015
Location: Ypsilanti, MI
Posts: 116
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No need to remove the plenum for alternator R/R. Sure, there?s more room if you do pull the plenum, but its do-able without.
Just need to pull the throttle body extension (air horn) and oil pressure sender and there?s just enough room to get it in and out. Sent from my iPhone using ZR-1 Net Registry
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1991 ZR-1 #1438 Black/Black & Red |
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#4 | |
![]() Join Date: Aug 2006
Location: McLean, VA
Posts: 3,712
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#5 |
![]() Join Date: Sep 2016
Location: Ocala, FL
Posts: 889
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You may have to re clock the replacement alternator and for sure you will have to change the pulley. Or take the one you have to a reputable auto electric shop and have it rebuilt. The pulley is unique to the ZR one and critical for proper belt tension.
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Steve Young 1991 ZR-1 Quasar Blue Metallic/Black #729 Second Owner 1991 ZR-1 Dark Red Metallic/Black #2040 SOLD 1990 ZR-1 Dark Red Metallic/Saddle #1670 SOLD Double your happiness.....complain half as much. |
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#6 | |
![]() Join Date: Jul 2007
Location: Bartlett, IL
Posts: 7,154
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Also critical for RPM for the alternator itself (probably more so than the belt tension) I had swapped one once and used the wrong pulley (kept the OEM unit) and while it was much easier to install the belt, the High RPM of the alternator with the smaller pulley, killed it faster
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1990 Corvette ZR-1 #1051 Watson Headers (2" Primary) - Borla Catback Late Model IH - Plenum Coilovers - 4.10s Custom Interior NCM Lifetime Member #978 |
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