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Can't pull more than 26" of vacuum

gregwils on Mon May 30, 2011 9:21 AM User is offline

Year: 1986
Make: Porsche
Model: 911
Engine Size: 3.2
Refrigerant Type: R134
Ambient Temp: 75
Country of Origin: United States

I purchased a used Mastercool 90066 5 cfm two stage pump from fleabay. My system was emptied and opened to replace receiver drier and expansion valve and switch all o-rings to the green ones.

The pump pulled to 26 in about 10-15 minutes, but never further. I know this wasn't enough to boil the system, my question is really regarding the pump. I did run the vacuum for about two hours, never went higher than 26. The vacuum held over night, so I don't think I have a leak in my system. I was using a set of Mastercool gauges.

How can I know if the gauge is correct?

Is there a way to test the pump?

Does Mastercool have rebuild kits or will they rebuild pumps?

If the pump has seen better days is the only option the scrap yard?

Thanks in advance

Dougflas on Mon May 30, 2011 10:33 AM User is offline

Try running a vacuum with just the guages; make sure they are zered out first. Change the vacuum pump oil. You should use a micron guage to test your pump.

gregwils on Mon May 30, 2011 11:10 AM User is offline

A little knowledge is just what the doctor ordered.

The gauges were not zeroed. I reset them to zero, hooked up to just the pump and what do you know? 29.9 inches of vacuum. I am good to go. I quite possibly did boil all the moisture out of my system. Thanks Doug!

HVACNY on Mon May 30, 2011 11:38 AM User is offline

x2 on the zeroed out.

lambertjohn on Tue September 06, 2011 2:47 PM User is offline

Two questions related to this post:

1.) How do you zero out manifold gauges?
2.) How do you run a vacuum with just the gauges?

I have the same problem as the original poster; I'm pulling a vacuum to 26hg and no more. My gauges are the HF ones, and my vacuum pump is a Mastercool model 90059 rented at Autozone. Is there a way to zero out the gauges on the HF gauges? Any help would be appreciated.

Edited: Tue September 06, 2011 at 3:32 PM by lambertjohn

Dougflas on Tue September 06, 2011 6:58 PM User is offline

Disconnect your gages, remove the hoses. open the handwheels. Does the low and high gage indicate exactly zero? If not, there is an adjustment on the front face. Remove the gage covers and adjust the adjustment screw to indicate zero.

Then close the handwheels and place the center hose on the pump. Pull a vacuum and see if your low gage indicates 29.9. If not, the gages are leaking. Pour some oil at the threaded place on the bottom of each gage. If the vacuum increase, you found the leak. Gage manifolds do leak at the handwheel stems. Some sets are repairable by replacing the rubber parts on the stems.

lambertjohn on Tue September 06, 2011 7:40 PM User is offline

Thanks Dougflas. Appreciate it.

NickD on Wed September 07, 2011 4:32 AM User is offline

Vacuum pump I purchased back in 1965 still works well, was made in the USA, seems like anything you buy today is crap, believe that Mastercool is made in China. Not only taking our jobs, but only getting crap in return. Corporations are getting rich.

Contacted my congressman on this issue, tells me to buy stuff made in the USA, what is made in the USA, everything we buy is made in China. The lying bastard, probably getting huge campaign donations from China. Time we took our country back.

TRB on Wed September 07, 2011 3:57 PM User is offlineView users profile

Quote
Originally posted by: NickD
Vacuum pump I purchased back in 1965 still works well, was made in the USA, seems like anything you buy today is crap, believe that Mastercool is made in China. Not only taking our jobs, but only getting crap in return. Corporations are getting rich.



Contacted my congressman on this issue, tells me to buy stuff made in the USA, what is made in the USA, everything we buy is made in China. The lying bastard, probably getting huge campaign donations from China. Time we took our country back.

Nick I have had only a 2 or 3 Mastercool China pumps go bad over the years Who knows what is sold on Ebay bay. I know a guy that dumped a lot of stuff on Ebay after a fire. Everyone is out to buy cheap these days. If the item was purchased though us it would have came with the Mastercool warranty. While I don't care for our government. Can't put all the blame on them or even business. People have selected to buy cheaply priced products. We have both the China and US made Mastercool pumps listed on our site. Guess which ones are the hot sellers.



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lambertjohn on Thu September 08, 2011 12:58 PM User is offline

Hey, my wife was made in China. She works great!! But even she agrees, anything made in China is probably of inferior quality. We always try and buy American whenever possible. Even if it costs more. That's the only real way to bring jobs back to this country.

TRB on Thu September 08, 2011 1:44 PM User is offlineView users profile

90066 is the china pump.

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pippo on Fri September 09, 2011 4:05 PM User is offline

Right. Thing is- ironically, Chinese producer of say, a Mastercool pump makes them well, to specs dictated by mastercool. BUT, Counterfeiting is the problem. Yes, brake shoes, leather shoes, expensive Gucci women's handbags, Viagra, other pharmaceuticals, etc et c etc, are counterfeited in China big time. Even Wholesalers can not know what theyre getting.

You buy a Mastercool item, could be made well by legitamate factory could be counterfeited by China factory........

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TRB on Fri September 09, 2011 7:55 PM User is offlineView users profile

Quote
Originally posted by: pippo
Right. Thing is- ironically, Chinese producer of say, a Mastercool pump makes them well, to specs dictated by mastercool. BUT, Counterfeiting is the problem. Yes, brake shoes, leather shoes, expensive Gucci women's handbags, Viagra, other pharmaceuticals, etc et c etc, are counterfeited in China big time. Even Wholesalers can not know what theyre getting.



You buy a Mastercool item, could be made well by legitamate factory could be counterfeited by China factory........

Not so much if you buy from Mastercool itself as I do. I'm pretty sure they have their own plant in China to produce their items for the world wide market. What one gets of Ebay. Who knows! That's the price you pay with the flea market.



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When considering your next auto A/C purchase, please consider the site that supports you: ACkits.com
Contact: ACKits.com

iceman2555 on Fri September 09, 2011 8:47 PM User is offlineView users profile

There are good and bad products made in China....some made in USA corps have manufacturing facilaties there....and turn out some good stuff....be surprised how much OE stuff comes in from that market....but then....what the heck..keeps the price of that $40k Camaro in check. Have learned one important aspect of 'some off shore' production....they seem to care very little about specifications and tolerances. .001 works as well as .010 right....wonder how many of 'made in USA' companies went to China to escape the EPA...???
Still trying to determine the math...send jobs off shore....and still expect the un employment % in USA to srink.....must be Washington math. Think we should turn every last one of those SOB's out of office....every one...heck a new virgin crop could not screw it up any worse. Sorry gotta run...head over and get my unemployment check...food stamp card....EBT card....and my govement cash card for the rent and...oh heck...gotta lease paymint on my Lexis due next week.....ohhh hell....looks like chickin this week and no steak....hate it when that happens.

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The strongest reason for the people to retain the right to keep and bear arms is, as a last resort, to protect themselves against tyranny in government.
Thomas Jefferson

TRB on Sat September 10, 2011 12:29 AM User is offlineView users profile

Quote
Originally posted by: iceman2555
There are good and bad products made in China....some made in USA corps have manufacturing facilaties there....and turn out some good stuff....be surprised how much OE stuff comes in from that market....but then....what the heck..keeps the price of that $40k Camaro in check. Have learned one important aspect of 'some off shore' production....they seem to care very little about specifications and tolerances. .001 works as well as .010 right....wonder how many of 'made in USA' companies went to China to escape the EPA...???

Still trying to determine the math...send jobs off shore....and still expect the un employment % in USA to srink.....must be Washington math. Think we should turn every last one of those SOB's out of office....every one...heck a new virgin crop could not screw it up any worse. Sorry gotta run...head over and get my unemployment check...food stamp card....EBT card....and my govement cash card for the rent and...oh heck...gotta lease paymint on my Lexis due next week.....ohhh hell....looks like chickin this week and no steak....hate it when that happens.

Ice.

I heard Rush say the other day. That people don't want a job, aka producing something. They want employment, aka paycheck insurance and so on. I have to agree it's time to toss them all out.

Spell check is fixed.

-------------------------
When considering your next auto A/C purchase, please consider the site that supports you: ACkits.com
Contact: ACKits.com

pippo on Sat September 10, 2011 11:49 AM User is offline

Quote
Originally posted by: iceman2555
There are good and bad products made in China....some made in USA corps have manufacturing facilaties there....and turn out some good stuff....be surprised how much OE stuff comes in from that market....but then....what the heck..keeps the price of that $40k Camaro in check. Have learned one important aspect of 'some off shore' production....they seem to care very little about specifications and tolerances. .001 works as well as .010 right....wonder how many of 'made in USA' companies went to China to escape the EPA...???

Still trying to determine the math...send jobs off shore....and still expect the un employment % in USA to srink.....must be Washington math. Think we should turn every last one of those SOB's out of office....every one...heck a new virgin crop could not screw it up any worse. Sorry gotta run...head over and get my unemployment check...food stamp card....EBT card....and my govement cash card for the rent and...oh heck...gotta lease paymint on my Lexis due next week.....ohhh hell....looks like chickin this week and no steak....hate it when that happens.

Iceman, good points. On your question how many escaped from the EPA, I say all of them. All the dye manufacturers went to India. 99% of the Chrome platers went to China. But, these are toxic dirty/even deadly industries- not sure if Id want one in my town.

On the Washington math idea: yes, youre right, but Id just add to that - as Washington/Wall Street math, as Washington IS run by Wall Street. Bernake, Pauslon (gone now), Geithner, etc. They wotrrk on wall st then get new jobs in Wash. to bail out their cronie buddies in NYC with our $$$$. Then, they cry "free market capitalism" until they get in a jam- then its OK to shift to being Communist to be able to take govt $$, just for a while though, then its back to being a free market capitalist, cuz after all, were in the USA that stands for Freedom.


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