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84 Eagle 6V92 Blowing Black Smoke

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marcg6
Posts: 11
Joined: Wed Jun 28, 2017 10:11 am
Bus Model: 1984 Silver Eagle Model 10 Professional Conversion

84 Eagle 6V92 Blowing Black Smoke

Post by marcg6 »

All,
I have a 1984 Silver Eagle with the 6V92 converted to automatic and when I accelerate it blows out black smoke from the exhaust pipe. Once I'm going at a steady speed hardly no black exhaust is noticeable. Only when I get on the pedal, either from stop and go or accelerate to get to a faster speed.
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beltguy
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Posts: 2663
Joined: Wed Oct 08, 2008 4:39 am
FMCA #: F246286
Bus Model: 1985 Eagle 10 with Series 60 and Eaton AutoShift 10 speed transmission (SOLD)
Location: Evergreen, CO
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Re: 84 Eagle 6V92 Blowing Black Smoke

Post by beltguy »

The black smoke is probably normal. The smoke will occur until the turbo builds pressure.

In those years Eagle had a couple of ways of trying to control the acceleration smoke. They tend to make acceleration a bit slow and some folks defeat the systems. Sounds like someone did that on your bus.

Jim
Jim Shepherd
Evergreen, CO
'85 Eagle 10 with Series 60 & Eaton AutoShift 10 speed transmission SOLD
2005 Dodge 2500 with 5.9 Cummins and 6 speed manual 2022 Sunset 28 foot trailer
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akroyaleagle
Club Member
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Posts: 486
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FMCA #: F180747
Bus Model: 1978 Model 05
Location: Sioux Falls, SD

Re: 84 Eagle 6V92 Blowing Black Smoke

Post by akroyaleagle »

You may see a puff of black smoke when accelerating if the throttle delay has been removed. Drive with a light foot.

More likely you have a turbo leak.

Black smoke is unburned fuel. Too much fuel for the amount of air available.

Get someone who hears better to listen for a high pitched whine when you are accelerating.

Check all the clamps and air tube connections from the turbo to the intake horn.
Joe Laird
'78 05
Sioux Falls, SD
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marcg6
Posts: 11
Joined: Wed Jun 28, 2017 10:11 am
Bus Model: 1984 Silver Eagle Model 10 Professional Conversion

Re: 84 Eagle 6V92 Blowing Black Smoke

Post by marcg6 »

Thanks for the feedback everyone. I was looking over my exhaust and observed two areas where it connects with clamps and observed some exhaust leaking around those clamps. I will work on tightening up those and go from there.
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