Mack ENDT-673

[1wonton]

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

[tjc transport]

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. 

[Brian L Blaylock]

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 

[JoeH]

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

[glitchwrks]

I do like to add a cheap mechanical boost gauge on turbocharged vehicles to get an idea of how healthy the turbo and plumbing is. Just because it whistles doesn't. mean the boost pressure goes where it needs to! You can usually pick up something adequate from Summit Racing or your choice of parts shops. If you don't want to tap a fitting into a casting or hard pipe, you can usually find a place in a flex coupling to bolt in a hose barb.

Like TJC Transport said though, if the turbo is really sick there will be a ton of smoke.

[james j neiweem]

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.