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Thoughts on how to recover from a slightly cross threaded spark plug threads in head?
To follow up, I used the expanding back tap mentioned above and it worked. I wasn’t able to get either a low profile thread chaser or new plug to start though, so I used the back tap several times. I was able to get it to start even fully expanded, so went ahead and really worked on getting a...- beady
- Post #14
- Forum: Tech Discussion
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Thoughts on how to recover from a slightly cross threaded spark plug threads in head?
I just ordered a regular, tight clearance thread chaser and also a “back tap” which you insert to the good threads, expand, and back out. At least one person had luck on an iron head. Back tap- beady
- Post #5
- Forum: Tech Discussion
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Thoughts on how to recover from a slightly cross threaded spark plug threads in head?
Is that deep enough/has enough clearance to get a socket on that hex and fit into the opening in the head? I thought I read ppl saying those were too large in some cases. I did pick up a 14x1.25 tap this evening, might order a single ended thread chaser before I try the tap though.- beady
- Post #3
- Forum: Tech Discussion
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Thoughts on how to recover from a slightly cross threaded spark plug threads in head?
Was installing a DUI distributor, coil, wires, and plugs. Got distributor and coil installed and old plugs out. Started installing new plugs and hit a snag. 454, #8 rearmost passenger side. Felt like it went in ok a few turns and then I started tightening with a ratchet, but it didn’t feel...- beady
- Thread
- Replies: 14
- Forum: Tech Discussion
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‘87 454 R20 eye watering exhaust w/ windows down
just pulled them today actually. Most looked pretty good. A couple were nasty and oily though. They did NOT all look black with soot/running rich though. But…. I cross threaded #8 with the new plug : (. Going to post a new thread asking what my options are.- beady
- Post #21
- Forum: Tech Discussion
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‘87 454 R20 eye watering exhaust w/ windows down
Thanks, I actually bought a 3-wire o2 sensor for my OBS that had true duals also, but the truck got hit before I installed it. Still have it, should work on this truck. I’ll email him.- beady
- Post #20
- Forum: Tech Discussion
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Can you let AC flush sit in lines and hoses and blow it out later?
So I’m replacing most the the AC stuff in my ‘87 suburban R20 with rear air. Condenser, front evaporator, compressor, dryer, rear expansion valve, etc. Basically everything except lines and rear evaporator currently. I took off the rear expansion valve from the evaporator, and it looks... -
Vintage Air Gen V (5) or replace existing compressor, etc., for 1987 R20 Suburban?
I ended up using an Adele style clamp from the hardware store. Still not finished with everything, so not sure how it’ll work long term. I have the heater box mostly back in and the cable seems to function correctly. -
Vintage Air Gen V (5) or replace existing compressor, etc., for 1987 R20 Suburban?
Thanks, good thought. -
Vintage Air Gen V (5) or replace existing compressor, etc., for 1987 R20 Suburban?
Any thoughts on how to repair this heater box? Was held on with two short lag bolts at the bottom from inside the truck. And the plastic tab that holds the spring/cable is broken off. Anyone epoxy repaired, or maybe there are replacement tabs/reinforcements you can buy? -
Vintage Air Gen V (5) or replace existing compressor, etc., for 1987 R20 Suburban?
Thanks. I bought a new one, so plan on replacing it. -
Vintage Air Gen V (5) or replace existing compressor, etc., for 1987 R20 Suburban?
Making some progress. Have condenser and front evaporator out and all the rear AC stuff pulled down (that wasn’t fun). Whoever said the wheel was just rubbing was correct. Looks like fa wheels aren’t on the shafts the same amount and the motor wasn’t centered either. Also, the plastic... -
Vintage Air Gen V (5) or replace existing compressor, etc., for 1987 R20 Suburban?
Well, here’s what I ordered. I also ordered (from Amazon) uv dye and a bottle you pressurize full of the flush to force it through the lines. I’m just keeping the lines in the engine bay, lines to the rear, and the rear evaporator/coils. Hopefully I can flush it well enough. Can anyone... -
Vintage Air Gen V (5) or replace existing compressor, etc., for 1987 R20 Suburban?
I can't really tell which compressor I need. If you go to RockAuto https://www.rockauto.com/en/catalog/chevrolet,1987,r20+suburban,7.4l+454cid+v8,1300835,heat+&+air+conditioning,a/c+compressor,6628 it lists several as a fit and look similar (although some can be discounted because the pulleys... -
Vintage Air Gen V (5) or replace existing compressor, etc., for 1987 R20 Suburban?
Thanks. Tunnel traffic is great, isn’t it. Lol…… I need to figure out if I need a different orifice tube to keep the rear ac happy. I thought I read use white, but maybe that was just for trucks and not suburbans? It had a white one in it when I bought it. I think I may block off the... -
Vintage Air Gen V (5) or replace existing compressor, etc., for 1987 R20 Suburban?
My squarebody is 1987 454/TH400 R20 3/4 ton 2wd 3:42 suburban. My gmt400 is a 1993 350/4L80E k2500 3/4 ton 4wd 4:10’s suburban. Was a fire dept truck and base, base, base Cheyenne model. Tailgate with vinyl bench seats, rubber floor mat, manual windows and locks, w/t single headlights, no... -
Vintage Air Gen V (5) or replace existing compressor, etc., for 1987 R20 Suburban?
Are there other things I can use from a gmt400? I have my 1993 K2500 350 tbi/4L80E that was totaled, but the drivetrain and interior are in great shape. Also, I can’t find your build thread for some reason. -
Vintage Air Gen V (5) or replace existing compressor, etc., for 1987 R20 Suburban?
My 454 truck has the same fan. It runs all the time as soon as the key is turned to ON. From this thread I’m guessing something isn’t right with that? -
Vintage Air Gen V (5) or replace existing compressor, etc., for 1987 R20 Suburban?
I already replaced it, those were pics when I took the one that was in there out. I’ll look into the alcohol for flushing, thanks. -
Vintage Air Gen V (5) or replace existing compressor, etc., for 1987 R20 Suburban?
Thanks. Yeah, I’m torn btwn spending $ to try to flush stuff vs. just replacing with parts that’ll have better heat transfer, etc. I do like the idea of clean, r134 sized heat exchangers, but if they are already large enough, and not much more than buying a bunch of cans of flush it makes... -
Vintage Air Gen V (5) or replace existing compressor, etc., for 1987 R20 Suburban?
Thanks for those pics, helpful. -
Vintage Air Gen V (5) or replace existing compressor, etc., for 1987 R20 Suburban?
This is the sticker on it. I didn’t have much luck getting anything from it online. -
Vintage Air Gen V (5) or replace existing compressor, etc., for 1987 R20 Suburban?
I was trying to find that compressor and from pics I found it was listed on a straight-6 engines truck I think. I couldn’t cross reference it to the 454, so wonder if it’s been swapped. The lines look like they may not be original to the truck? I’m not bothered with originality as long as... -
Vintage Air Gen V (5) or replace existing compressor, etc., for 1987 R20 Suburban?
Hi all, I bought this clean 1987 R20 454 Suburban a couple months ago. The AC didn’t work, and when I hooked my gauges up only had about 10 psig on the low side. It had r134 fittings already, but I went ahead and replaced the schrader cores and replaced the orifice tube and o-ring. Pulled a... -
1987 454 TBI down on power, runs good otherwise
So following up on the solution. The thermostatically controlled flapper on the air filter housing didn’t have the hose running down to the shroud on the exhaust manifold to supply heat and open the flapper. So the engine was choked for air. I wedged a rag to hold the flapper open and it runs...- beady
- Post #43
- Forum: Tech Discussion
