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  #1  
Old 08-24-2005, 03:28 PM
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Join Date: Dec 2003
Location: COASATAL NORTH CAROLINA
Posts: 51
300TE AC leak

We have a '93 300TE 4Matic. I had the AC topped up this year and then discovered that I was losing refrigerant. After putting in a dye leak indicator we found that the dust cap over the fill port had been screwed down tight enough to slightly depress the spring loded ball valve. That was the leak. After removing the dust cap there is no leak. Apparently the dimensional tolerances are very close and a slight overtightening hits the valve. I put a small "O" ring in the cap to allow it to seat on the upper surface of the fill port to eliminate the problem.

SRHARVEY

'93 300TE 4Matic 275M
'83 240 D 245M
'82 380 SL 140M

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  #2  
Old 08-24-2005, 06:01 PM
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Interesting...

Sounds like the shrader valve can be tightened a bit.


Michael
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83 300d
01 vw A4 TDI
66 Chevy Corsa
68 GMC V6 w/oD
86 300E
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  #3  
Old 08-24-2005, 06:55 PM
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AC leak

The port is not a Schrader type valve. It is a spring loaded ball with no adjustment.

srharvey
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  #4  
Old 08-24-2005, 08:22 PM
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Join Date: Jun 2005
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The service port caps are supposed to have seals. Whoever serviced the system should have noticed this.
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  #5  
Old 08-25-2005, 09:44 AM
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Must have been changed....


Would have been a schrader valve orginally. Maybe that is why it's high-aftermarket part. Sounds better to have ball-valves. I've replaced plenty of leaky schrader valves.

M

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66 Chevy Corsa
68 GMC V6 w/oD
86 300E
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