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How much oil?

Bashed 68 on Thu September 04, 2008 11:47 AM User is offline

Year: 1968
Make: Ford
Model: Mustang
Engine Size: 351W
Refrigerant Type: R12
Ambient Temp: 95

I’m rebuilding the system in my ’68 Mustang. It has the factory in-dash system. Because of the serpentine conversion kit I’m using, I had to purchase a new compressor (Sanden 7176). Since I want to recharge the system with R12, the vendor I purchased it from tells me that it contains ester oil, and that I should simply pour it out and replace it with mineral oil.

I did some searches on here and I get general agreement with that position – that it’s better to run mineral oil in an R12 system.

I’m using a new evaporator, dryer, and all new lines. The only “original” component remaining is the condenser, which will be flushed out.

I was able to get about 4 oz of oil out of the new compressor. So, pouring an equal amount of mineral oil back in is a no-brainer. What I need to know is how much mineral oil I should put into the various other components before reassembling the system.

On a side note, I’m curious for opinions as to the adequacy of this (small) compressor to do the job on hot Texas summer days. I have dual Spal electric fans. Should I have them come on when the compressor is on?

Thanks in advance,
PJ


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Resto-modding a '68 Mustang convertible. I wanna do it right.

Chick on Thu September 04, 2008 7:51 PM User is offlineView users profile

Mineral oil is the right oil since thats what it used, but a "quality" ester like BVA auto 100 works fine with R12 or R134a, and is the only oil I use in retrofits, and R12 systems that have been flushed. Just a better oil in my opinion.. Do you know what the refrigerant capacity is? that could help determine the oil capacity. But the compressor you are using will be fine, and I would guess between 8 and 9 ounces (depending on R12 capacity) would be fine..Hope this helps..
PS: The old compressor had a crankcase, so it took more oil...

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Chick
Email: Chick

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Freedoms just another word for nothing left to lose

Bashed 68 on Fri September 05, 2008 9:33 AM User is offline

According to my shop manual, the factory system requies 1 3/4 lbs of Freon.

I misspoke about the amount of oil - I got 2 1/2 oz. out of the compressor, not 4 oz.

I read somewhere that Sandens don't need oil circulating in the system because they don't have flapper valves like the old Tecumseh compressors do. That goes against everything I've ever read about AC systems...

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Resto-modding a '68 Mustang convertible. I wanna do it right.

Chick on Fri September 05, 2008 9:02 PM User is offlineView users profile

Your system should take between 6 and 7 ounces if that is all the refrigerant it takes, be sure to confirm that.. Yes, the oil will circulate with the refrigerant since there is no crankcase on the sanden, and it needs to be lubricated..Hope this helps..

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Chick
Email: Chick

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Freedoms just another word for nothing left to lose

dinoca65 on Mon March 16, 2009 2:53 PM User is offline

Quote
Originally posted by: Bashed 68
I’m rebuilding the system in my ’68 Mustang. It has the factory in-dash system. Because of the serpentine conversion kit I’m using, I had to purchase a new compressor (Sanden 7176). Since I want to recharge the system with R12, the vendor I purchased it from tells me that it contains ester oil, and that I should simply pour it out and replace it with mineral oil.



I did some searches on here and I get general agreement with that position – that it’s better to run mineral oil in an R12 system.



I’m using a new evaporator, dryer, and all new lines. The only “original” component remaining is the condenser, which will be flushed out.



I was able to get about 4 oz of oil out of the new compressor. So, pouring an equal amount of mineral oil back in is a no-brainer. What I need to know is how much mineral oil I should put into the various other components before reassembling the system.



On a side note, I’m curious for opinions as to the adequacy of this (small) compressor to do the job on hot Texas summer days. I have dual Spal electric fans. Should I have them come on when the compressor is on?



Thanks in advance,

PJ

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