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How can I tell if my turbo is working on the Mack B75, ENDT673?

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if the turbo ain't working, it will look like a steam locomotive going down the road with all the black smoke pouring out of the exhaust. 

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If you raise the passenger side hood stand beside the truck and rev the engine up a little by hand you should be able to tell if the turbo is spinning or not 

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If you hear a whistle as you're driving under acceleration you're A-okay!

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if this is the original 673 turbo engine (205Hp) try not to push it beyond its 205 HP capabilities. I believe they just slapped a turbo on this engine without any upgrades such as piston pin cooling and bottom end upgrades. There is more info about this engine on this sight somewhere. This was a very smooth sounding diesel. Eventually this engine went to 225 Hp and 250 HP before it was eclipsed by the 237 maxidyne.

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