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  #1  
Old 11-21-2012, 01:31 PM
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Waste gate shaft not moving...

I have an '87 300SDL that I've been working on - had a plugged up exhaust that I recently relieved.

While I had this area of the engine apart I tried testing the waste gate - I applied pressure using Mighty Vac hoping to see movement in the rod that connects to the waste gate. I heard a good pop when I applied pressure but the rod never moves! It seems stuck in place. I tried tapping on it with various instruments trying to get it dislodged but no joy... I suppose the risk form that condition is that the turbo can over-boost the motor....

What do I need to try to get it to move?!

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Old 11-21-2012, 06:25 PM
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how much pressure were you able to apply with you mighty vac,its going to take almost 12 psi to move the wastegate . Don
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  #3  
Old 11-21-2012, 11:07 PM
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I didn't measure it - tThe MightyVac doesn't show positive pressure on the dial... only the Vac (mmHg) so I don't know for sure, but I pumped the vac 'til it couldn't go anymore... felt like I've reached its capacity. I could put a "T" in there and check accurately with a pressure guage... Will need to try that.

Meanwhile - shouldn't I be able to move that wastegate shaft by hand? It sure feels immovable to me...
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1987 Mercedes 300SDL; SOLD
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1995 Toyota Land Cruiser - 3X locked; 182K
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Old 11-23-2012, 12:21 PM
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I never tried moving one by hand but realize that Vac is the opposite of Pressure


You need to be putting 12psi or so into the wastegate hose not vac.


Quote:
Originally Posted by MercFan View Post
I didn't measure it - tThe MightyVac doesn't show positive pressure on the dial... only the Vac (mmHg) so I don't know for sure, but I pumped the vac 'til it couldn't go anymore... felt like I've reached its capacity. I could put a "T" in there and check accurately with a pressure guage... Will need to try that.

Meanwhile - shouldn't I be able to move that wastegate shaft by hand? It sure feels immovable to me...
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  #5  
Old 11-23-2012, 12:24 PM
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Quote:
Originally Posted by oldiesel View Post
how much pressure were you able to apply with you mighty vac,its going to take almost 12 psi to move the wastegate . Don
Correct....

The wastegate valve stem is hollow for cooling, which creates a pressure of 'killer' bleed that you have to overcome.

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