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#11
Mechanicals / Re: Staying On Topic
Last post by Chigham - 20 April 2024, 12:29 PMQuote from: admin on 19 October 2011, 12:24 AMPlease keep all discussions on topic and respect the discussion instigated by the original poster.
There is no additional charge for starting new topics!
Should you wish to take any discussion off topic, please do so by starting a new topic in the appropriate category. In such a case, you may still quote from the original discussion.
Should the topic starter discover the subject for the original issue is incorrect due to a misdiagnosed issue, please take the time to change the subject to reflect the correct issue.
Staying on topic ensures that discussions are easily found by all existing and new members and ensures that anyone wishing to participate in the discussion can do so without confusion or distraction.
#12
Mechanicals / Re: Some technical questions a...
Last post by Chigham - 20 April 2024, 12:28 PMQuote from: Gpapaniko on 13 September 2023, 07:21 AMI'd check out Kent Burgsma on Mercedessource on YouTube for tips on the vacuum leaks. My central locking lasts for about 20mins so enough time to lock the car but not enough to reopen her for all the passengers. Ive done some chasing of the lines for obvious leaks without luck. The vacuum tank is under the rear parcel shelf. If you are getting 2 hours, its actually pretty good. My tensioner also looks bent but otherwise no squeals. I do have a noisy ac clutch and the system runs quieter with the ac on
#13
Mechanicals / Re: A/C compressor confusion? ...
Last post by 79W116 - 19 April 2024, 08:49 PMThank you all for your replies.
So I ran the DEF and the compressor doesn't come on with that either.
I did press the low side shrader valve and it sounded like a car tire. So there is certainly some pressure.
My next step seems to be to find what opens the flap to mix heat and cool. It's stuck on heat only. Even with out the compressor i used to get fresh cool air, but now just solid heat, ans i dont see the hamilton servo moving.I don't hear any vacuum leaks, and when I leave the car for half a day the door locks are still strong, so I dont think that's it.
So I ran the DEF and the compressor doesn't come on with that either.
I did press the low side shrader valve and it sounded like a car tire. So there is certainly some pressure.
My next step seems to be to find what opens the flap to mix heat and cool. It's stuck on heat only. Even with out the compressor i used to get fresh cool air, but now just solid heat, ans i dont see the hamilton servo moving.I don't hear any vacuum leaks, and when I leave the car for half a day the door locks are still strong, so I dont think that's it.
#14
Mechanicals / Re: Heater always on
Last post by Rolo - 19 April 2024, 04:39 PMI experienced the same with ACC. Replaced with UWT electronic controller. A big mistake. Rebuild the existing unit.
#15
Mechanicals / Re: Glow Plug Light (1979 300S...
Last post by amilio - 19 April 2024, 11:16 AMDid you test them by taking them out of the holes and seeing if they glow? Wondering if I'm having the same issue. Thank you for updating!
#16
Mechanicals / Re: Glow Plug Light (1979 300S...
Last post by benzjag - 19 April 2024, 01:53 AMUPDATE!
Long story short, I had 2 glow plugs bad even though they tested good using my ohms meter at the relay AND getting a spark at each plug by running a wire from the positive terminal on the battery (to each plug)!
In working on MB diesels for 30 years, this is the 1st time I have seen this!
I replaced all plugs. The light now does not blink (and the car runs perfectly after the light goes out)!
Long story short, I had 2 glow plugs bad even though they tested good using my ohms meter at the relay AND getting a spark at each plug by running a wire from the positive terminal on the battery (to each plug)!
In working on MB diesels for 30 years, this is the 1st time I have seen this!
I replaced all plugs. The light now does not blink (and the car runs perfectly after the light goes out)!
#17
Mechanicals / Re: A/C compressor confusion? ...
Last post by benzjag - 19 April 2024, 01:37 AMAs others have said, a low amount of refrigerant in the system will prevent the compressor from coming on. A quick unscientific check is to press the pin on the low side port where you put the refrigerant in. It will have a blue cap after R134 was used. If you get a weak or no release of refrigerant when pressing the pin, you have a low or no refrigerant in the system.
I just added refrigerant today to my 79 SD. It is very normal to have to add refrigerant UNLESS every component has been changed including hoses and seals!
I just added refrigerant today to my 79 SD. It is very normal to have to add refrigerant UNLESS every component has been changed including hoses and seals!
#18
Mechanicals / Re: A/C compressor confusion? ...
Last post by daantjie - 16 April 2024, 05:47 PMI'm not super familiar with the Hamilton unit but with the original unit if you hit DEF that should always give you compressor engagement and max heating coming out of the windshield vents.
Might still be worth taking it to a reputable auto AC shop and let them check it out. Sometimes you get lucky and they have an oldtimer on hand that has seen it all
Might still be worth taking it to a reputable auto AC shop and let them check it out. Sometimes you get lucky and they have an oldtimer on hand that has seen it all
#19
Mechanicals / Re: Mercedes 450SEL 6.9 engine...
Last post by daantjie - 16 April 2024, 04:06 PMI still highly doubt that the suspension pump could make such a racket. You could take a mechanics stethoscope and put the probe to the pump to see if you hear this clacking noise inside the pump. Sometimes these very basic tools can be quite helpful.
#20
Mechanicals / Re: Mercedes 450SEL 6.9 engine...
Last post by harrycarry250 - 16 April 2024, 01:47 PMThank you, yes that is the most logical thought process and id like to believe I have considered all the small potentials.
This has been an issue for over 6 years.
I've had cars with bad rod bearings and this doesn't really sound like one, but you never know.
To those who have had the pump noise. Did your suspension function as normal?
This has been an issue for over 6 years.
I've had cars with bad rod bearings and this doesn't really sound like one, but you never know.
To those who have had the pump noise. Did your suspension function as normal?