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  #1  
Old 08-13-2009, 11:09 AM
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Questoin about 86 300SDL

Is an 86 126 300SDL one with the # 14 head?

- Peter.

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  #2  
Old 08-13-2009, 11:11 AM
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If it's original, yes.

-J
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1991 350SDL. 230,000 miles (new motor @ 150,000). Blown head gasket

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  #3  
Old 08-13-2009, 11:11 AM
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If original yes.
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  #4  
Old 08-13-2009, 11:31 AM
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I have over 200k miles on a #14 head. If the car has been taken care of meticously like mine was you have nothing to worry about.
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1986 300SDL, 211K,Dealership serviced its whole life
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  #5  
Old 08-13-2009, 11:37 AM
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I agree with Oracle not all #14's were junk, there was a problem with them but not everyone made had issues. Mine is well into the high 300's.
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  #6  
Old 08-13-2009, 12:51 PM
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My #14 head has 316,000 miles and 23 years under its belt...
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  #7  
Old 08-16-2009, 02:57 AM
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How can you tell if a 300SDL with a #14 head has problems?
I just test drove an 1987 300SDL with a #14 head, ~247K on it and it seemed to run great...
The temp guage did get up to ~85C and the accelerator pedal had a consistent (weird) vibration that sort of tickled your toes after a while...?
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  #8  
Old 08-16-2009, 03:43 AM
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Try the radiator hose pinch test. Press the radiator hose 12 hours after the engine was shut off. If you feel pressure, it's probably residual compression pressure leaking past the head gasket or cracks in the head keeping the cooling system pressurized. The cooling system's natural operating pressure should subside as the coolant returns to ambient temperature.

Sixto
87 300D

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