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Re: Vacation Car - 56 Patrician
#1
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CarFreak
Okay. So it appears not much out there for expansion valves when it comes from the automotive side of things. However, I opened my search to things like big truck and tractors since they have similar sized systems.

What about this valve:

https://www.hy-capacity.com/air-condit ... gle-externally-equalized/

It is a right angle, but I am having trouble finding this type of valve as a straight through, let along with flare connections

Posted on: Today 13:39
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Re: Vacation Car - 56 Patrician
#2
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CarFreak
This past weekend I didnt get much time to get work done. I finished tapping the back of the grille and I got the drive shaft disassembled and painted. I am going to be all over the place this month so I will wait to start masking the grille for paint.

Finally got someone at original air to give me a call back. According to them they do not have the capability to add O-ring style connections onto the evaporator. They claimed that if I use copper washers in the connections it will seal fine with R134a... I guess I really dont have much choice at this point.

Still no news on what expansion valve I can use. Original Air said they would consult with their technician and give me a call back but still no word.

Posted on: 9/13 15:32
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Re: Vacation Car - 56 Patrician
#3
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CarFreak
This weekend I got some parts received in. I got the U-joints in so I can strip and paint the drive shaft in preparation for that being installed.

and I got the evaporator back... It looks nice but it still has the flare type connections even though the work order I submitted said to change out those connections for the O-ring style. They are going to check with the technician to see why the work order wasnt followed and we will go from there.

Submitted my request to a couple places in regards to getting an expansion valve picked out, but so far no response. I guess that is good considering the connections on the evaporator have not been solidified yet.

Posted on: 9/7 13:41
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Re: Vacation Car - 56 Patrician
#4
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CarFreak
So i got the body mounts in for a 55 chevy. They are all the same thickness... So they will not work. I will have to end up getting the ones from Steele Rubber.

This past weekend I tried out my fixed ultra sonic cleaner and it is working again! got the carb nice and cleaned and back together.

Still no word on the expansion valve...

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Posted on: 8/31 15:16
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Re: Vacation Car - 56 Patrician
#5
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CarFreak
Thank you for all of that!! that is a major help!!

Being that this is a 5682, according to the service manual this wont have body mount 3 and my number 5 mount should be a little different than a 5687-99.

However, it appears that depending what body you got 6478987 (Steele 30-0501-48) is either considered "thick" or "thin" (in accordance with the parts manual 30.1004). which really doesnt make sense because 6478987 is the same thickness as 6478986 (steele 30-500-48) which are thicker than the "thin" 6478985 (steele 50-0097-48).

Thankfully the only mounts that I removed are the radiator cradle, and the parts manual for that is clearer as which cushion goes where.

I Ordered body mounts for a 55 chevy in polyurethane because Ross claims they could work with some modification. Plus Polyurethane would hold up better environmentally than rubber. Ill measure them and compare them too the dimensions listed on steele rubbers website to see if they would work and what modifications may be needed.

Posted on: 8/19 9:05
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Re: Vacation Car - 56 Patrician
#6
Just can't stay away
Just can't stay away

CarFreak
No update on the A/C Equipment, I still need to call about the expansion valve to get more information on that.

So I am looking at body mounts, does anyone know which body mounts go at what mount position and what orientation? Steele rubber makes them and lists the dimensions on their website to show the differences, but Id like to know which ones go to which points on the car.

thanks!

Posted on: 8/18 15:52
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Re: Vacation Car - 56 Patrician
#7
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CarFreak
Quote:

HH56 wrote:
The book is entitled Auto Air Conditioning for Auto Mechanics by John Sensenig Jr. Published by Liaison Engineering Services and distributed by Remac Corporation of Dallas, Tx. I find no information on publish date but expect it is long out of print.

Here are a couple of photos of the 4 pages on the expansion valve. My scanner decided to be temperamental after the last software update so can't scan them. To make it worse, you probably will struggle to read the pages in the photos. If you can make them out the bit on why the externally sensed valve was needed with large evaporators is detailed fairly well on the third page next to the illustrations. The erratic action and flooding symptom was mentioned in another book's troubleshooting section on expansion valves and I don't remember where exactly that was.

As I said, maybe there was a limitation in the old valves or maybe R134a has different characteristics and that type valve won't be needed.


If I read that correctly it sounds like I just need an external equalized expansion valve if I have a pressure drop greater than 5 lbs (as opposed to an internally equalized valve). Which may mean I need additional plumbing of the refrigerant to the valve... Ill ask them and see what they have to say! thanks!

Posted on: 8/10 8:43
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Re: Vacation Car - 56 Patrician
#8
Just can't stay away
Just can't stay away

CarFreak
Quote:

HH56 wrote:

Are they going to spec or supply a new pressure drop sensing evaporator valve compatible with the large evaporator with the change in fittings or is that type of valve still needed with the R134a or actually, I wonder if it was ever really needed. I had read in an old AC book the reason Packard and other mfgs with large evaporators used that type valve was because the pressure drop was so great a regular valve had erratic operation and periodic flooding of refrigerant so engineers felt extra sensing was needed. Maybe modern valves are much better. Are you going with an electrical thermostat and cycling clutch for the temp control or is the modulator fixed temp valve Packard used still in the picture?


Those are good questions. That is something I am going to have to ask. I was planning on going with an off the shelf expansion valve. But I may need to rethink that. I was not planning on using the old packard valve, I was hopping the only "packard part" I needed to use was the evaporator and just get modern equivalents for everything else. Do you have the source for your information so I can use that as a talking point when I bring it up to them?

Posted on: 8/9 15:47
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Re: Vacation Car - 56 Patrician
#9
Just can't stay away
Just can't stay away

CarFreak
Quote:

CarFreak wrote:

I also picked up the resurfaced fly wheel today. Among other parts I ordered for the manual transmission:
Pilot bearing: MRC 204SF
clutch disc: NCF ND4220 (60s chevy truck)
Pressure plate: NCF 1107027 (71 ford F100 w/ 302)
clutch alignment tool: CTF-53010
Throw out bearing: got it from Max Merit
.


I was incorrect with the pilot bearing. I got the wrong one. it should be MRC 204SF 6. I was able to source it from Max Merrit. The one mentioned above has a larger ID. I suppose it could work in a pinch if a bushing was pressed into the ID of the bearing that was closer fitting to the OD of the trans input shaft.

Posted on: 8/9 15:26
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Re: Vacation Car - 56 Patrician
#10
Just can't stay away
Just can't stay away

CarFreak
One issue I have been trying to work through is a replacement Welch plug for the access hole to the tail shaft bearing snap ring. Well I found some on McMaster Carr that measure out to 1.505". However the hole is 1.508. Given that they have a slight dome on them I am going to try to flatten them a bit on my hydraulic press to hopefully increased the diameter to the point of sealing off that hole. We will have to wait and see.

I am going with the original air group to rebuild the evaporator. They said they could not only repair it, but also change out the flare type connections to O-ring style connections in preparation for R134a. I have a work order made and they told me it should take about 2-3 weeks to complete the work. Which would be nice if it all fits in the original Evap box without modification to that or the firewall openings. So we will see what happens.

I was able to go over the firewall and inner fenders again to smooth out the sanded areas. I also got the front half of the underside painted like I did the back half already.

Attach file:



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Posted on: 8/9 15:22
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