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  #16  
Old 05-16-2015, 07:30 PM
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Quote:
Originally Posted by tjts1 View Post
Not sure lots of Teflon tape is a good idea on a part that will see close to 1000f on a regular basis.
The Teflon was for the oil pressure which sees 100 psi cold. I was not advocating use of Teflon for EGT, which is under 15 psi in 617.9xx. Maybe it does not need anything to seal? If it does, I'd use aluminum foil strips.
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  #17  
Old 06-12-2017, 12:53 PM
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Originally Posted by tjts1 View Post
The problem with most of the boost gauges on the market is they also include a vacuum section which is kind of useless on a diesel.
If you have an N/A diesel, vacuum section is useful and the boost section is useless.

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Originally Posted by funola View Post
The Teflon was for the oil pressure which sees 100 psi cold. I was not advocating use of Teflon for EGT, which is under 15 psi in 617.9xx. Maybe it does not need anything to seal? If it does, I'd use aluminum foil strips.
The pressure is irrelevant. The concern with teflon tape for EGT is the temperature. Above ~230 C, teflon releases poisonous fumes that will put you in the hospital. Above ~500 C, teflon produces a deadly gas that will kill you at even minute concentrations. It's called octafluoroisobutylene and is 10x more deadly than the phosgene gas used in trench warfare of WW I. You don't want to be anywhere near this stuff.
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Last edited by torsionbar; 06-12-2017 at 01:03 PM.
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  #18  
Old 06-12-2017, 08:28 PM
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Why would it be useful for a NA diesel exactly?
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  #19  
Old 06-12-2017, 10:02 PM
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Clogged air filter warning? Our GM Diesel has a ratcheting indicator downstream of the air cleaner that goes from green to yellow to red as the filter clogs.

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  #20  
Old 06-12-2017, 10:47 PM
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Originally Posted by sixto View Post
Clogged air filter warning?
The air filter minders turn red at 25 inches of water, which is equal to 1.84 in-Hg ( or .8 psi)....not very visible on a typical automotive vacuum gauge.
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  #21  
Old 06-12-2017, 11:42 PM
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Why would it be useful for a NA diesel exactly?
Depends on the model, it would have to be one that uses a throttle plate or tuned intake in order to create significant vacuum. Certain years with 617 engine had these, and all the n/a 606's. Probably others too that I'm not familiar with. Anyways, old timers used vacuum gauges to train the driver for fuel economy.
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  #22  
Old 06-13-2017, 12:01 AM
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Originally Posted by torsionbar View Post
Depends on the model, it would have to be one that uses a throttle plate or tuned intake in order to create significant vacuum. Certain years with 617 engine had these, and all the n/a 606's. Probably others too that I'm not familiar with. Anyways, old timers used vacuum gauges to train the driver for fuel economy.
The 617's never came with pneumatic governed injection pumps - only the MW, and M pump post 1980 for non US cars Think the later throttles were only for EGR purposes (no vacuum as such) and later diesels also had them to prevent the engine bouncing off compression on shutoff I believe.

Diesels won't run with much vacuum, remembering you can't compress air to ignite fuel if you haven't got any air to compress in the first place (dynamic compression ratio / volumetric efficiency reduced).

The 80's petrol MBs had vacuum / "economy" gauges FWIW. No diesels
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1978 300D, 373,000km 617.912, 711.113 5 speed, 160cc superpump, HX30W turbo
1984 240TD>300TD 121,000 miles, *sold*
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1977 280> 300D - 500,000km

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