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Old 07-03-2018, 06:52 PM   #51
LT7A
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Re: Palf's 1981 GMC

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Originally Posted by N2TRUX View Post
What Bill is using is good for reducing resonance. It dampens the sound waves that are amplified by the bare sheet metal. It does offer a small amount of thermal protection, but its minimal. You need a composite barrier to reduce both resonance and thermal transfer.
In addition to the sound dampening, the bituminous layer provides a thermal break and is also somewhat of an insulator. The foil backing works like the expensive stuff and reflects the radiant heat. So it is effective and does what the more expensive stuff does, just not quite as well. It's a matter of degrees...

So to speak.
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Old 07-06-2018, 03:39 PM   #52
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Re: Palf's 1981 GMC

Been beating my head a while on this AC stuff, but I think I finally found the issue with the new compressor. From measurements and visdual you can see the factory recommended belt is too skinny. The 3/8" wide belt recommended would sit at the bottom of the compressor pulley and never touch the sides. It actually shock/wobbled in the pulley, causing it to screech,slip and eventually break.

I replaced it with a 1/2" wide V-belt and it fits the pully great. works on the engine pulleys also.

Hopefully you can see the difference in the pictures.

So far it seems to be fine. I picked up some pusher fans that I also am going to run evenetually to help cool the condenser so it will cool even better.
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Old 07-06-2018, 03:42 PM   #53
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Re: Palf's 1981 GMC

Next part of the week's projects was to install a factory front sway bar. It's not super huge (1 1/16") but way better than what was there. It really helps the ride/handling even with the small bar.

I also put on a new front air dam, the deeper 4x4 version. I think it really helped clean up the front end look.
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Old 07-06-2018, 03:54 PM   #54
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Re: Palf's 1981 GMC

Last of the projects was fixing up the windshield wipers washer system. I had an old generic pump lying around, so I hooked it up. Even though I replaced the wiper motor too, I went with the generic one for 2 reasons. 1-my factory plugin connector would not plug into the washer motor. 2-I never really like the factory washer motors. They seem to die quickly .

The other thing I did was to get a set of wiper arms off an 86 (or 87...I can't remember now) C10. They have the washer squirters built into the arms and they had a much better blade connection method.

I had to drill out/open up the little slot in the cowl to allow the hose to come thru. Other than that they go right on to the older assembly mounts.

They work good. The 80's style wiper arm covers were on the truck so I reused them since I need to touch up the flat black paint on the lower portion of the wiper arms.

Now back to driving it.
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Old 07-06-2018, 03:57 PM   #55
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Re: Palf's 1981 GMC

You've been busy! But yeah the belt should never touch the bottom of the pulley, I'd bet that you have solved your problem.
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Old 07-06-2018, 04:33 PM   #56
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Re: Palf's 1981 GMC

Great work Bill, all good updates/repairs.

I need to do a washer motor and blower resistor in the daughter's pickup.
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Old 07-06-2018, 04:56 PM   #57
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Re: Palf's 1981 GMC

Very good updates...and a nice diagnosis for the belt issue!
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Old 07-06-2018, 07:36 PM   #58
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Re: Palf's 1981 GMC

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Very good updates...and a nice diagnosis for the belt issue!
Lot's of head banging, hair pulling, and adjective hollaring. But finally my brain put it together.

Thank you
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Old 07-07-2018, 09:50 AM   #59
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Re: Palf's 1981 GMC

Thanks for sharing your up-sized belt idea. My compressor has a slight wobble/groan at idle that no amount of realigning has stopped. Maybe this is the fix.
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Old 07-07-2018, 10:07 AM   #60
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Re: Palf's 1981 GMC

Good stuff!
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Old 07-07-2018, 02:32 PM   #61
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Re: Palf's 1981 GMC

Cleaning up the shop mostly today, but did do one little update on the truck. Since the only thing running to it any more was the gas tank vent, I decided to remove the Vacuum/charcoal canister. Truck is a little slow filling, so figured the canister in its 37 years was a bit clogged, so out she went. That thing weighed a bunch. I can't ever remember getting a truck that still had one, so the weight kinda surprised me.

I added a motorcycle vent so that no dirt daubers or whatever gets in and clogs the vent line up.

The fill is not real bad on the 81, but I had no fill issues at all on my 83 using the cycle vent, so hopefully this will improve it some.
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Old 07-07-2018, 04:17 PM   #62
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Re: Palf's 1981 GMC

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I added a motorcycle vent so that no dirt daubers or whatever gets in and clogs the vent line up.
I was pondering this very issue this morning...great idea...gonna copy...
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Old 07-14-2018, 02:54 PM   #63
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Re: Palf's 1981 GMC

Vaaaaaaaaaaaaaaaaaa-rrooooooooooooooooooom



Now it truly is da-bomb
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Old 07-28-2018, 05:53 PM   #64
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Re: Palf's 1981 GMC

Beautiful and HOT day for a good cruise to a car show. Soooooooooooo glad I have AC. One of the car clubs was having a car appreciation day show north of here at a state water park. Lots of nice rides The GMC ran flawlessly. That swaybar sure helps the ride and handling. Few shots, plus the link to the photos I took today.

https://photos.app.goo.gl/LjqQ5WeVQCisVY9m8

Oh did I mention it is SO nice to have AC!
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Old 08-12-2018, 07:01 PM   #65
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Re: Palf's 1981 GMC

Not much done on truck lately. between woeking on wife and son's cars, plus the pilgrimage to my home land in Pittsburgh the truck rested. After visiting family a few days, we took the round about way to Mississippi thru Niagara Falls. My wife and son had never seen them. So we had fun on both sides of the falls.

First picture is a retreat near my sisters out side of Pittsburgh. Rest are at the falls. My son dangling in Canada. No issues except 3K+ miles in the baby bus (wife's CRV) in 8 days is rough for my size 14s and legs. No issues and Canada let me in and out, twice. Just had to remember the 40 on the sign was not the 40 on the CRV numbers. Luckily I didn't get caught

Back to trucking things this week I hope.
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Old 08-12-2018, 10:31 PM   #66
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Re: Palf's 1981 GMC

Nice pics!
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Old 08-13-2018, 06:57 PM   #67
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Re: Palf's 1981 GMC

You where only 2 hrs away from me in the Canada land.
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