[AT] Need help troubleshooting engine/compressor

[charlie hill]

Cecil,  those screw compressors are "positive displacement" air pumps.
You CANNOT choke them down by blocking the intake.  One of two things
is going to happen, whatever you put over the hole gets sucked in or the
engine shuts off.  The only possible exception would be a seal leaking
somewhere to allow it to bypass.  The pump will NOT stall.  
You're lucky you didn't get badly hurt.   

I sent a different message about the problem you're having.  

Charlie

-----Original Message----- 
From: Cecil R Bearden 
Sent: Tuesday, August 11, 2015 7:09 AM 
To: Antique tractor email discussion group 
Subject: Re: [AT] Need help troubleshooting engine/compressor 

Sullair 185 w/ ford/Mazda 4cyl gas engine.  Compressor always has been 
cold natured.  Had to be completely warmed up before choke could be shut 
off.  Open air line valve and engine would die without choke on at least 
half way.  Working fine a month ago.   Now, Engine tries to start and 
gets up to idle speed but compressor is loading engine and it cannot get 
up to operating speed.  If compressor could be disconnected from engine, 
it would get up to operating speed. Have replaced fuel pump, and plug 
wires.  Spark plug had some surface carbon but not really gunked up.  
took air intake elbow off of compressor and tried to cut off air intake 
to allow engine to start, but it nearly sucked my hand into the pipe.  
In the past distributor,ignition control box, and coil have been 
replaced.  Have worked on engines gas, propane and diesel for 50 years 
and this one has me beat......  This is the reason I like Diesel!!!

I use this for sandblasting and blowing off the round baler.  Right now, 
the baler has some hay lodged between the belts and the rollers on the 
back side and it has the baler bound up.  The only way to get this out 
is to use a lot of high pressure air and cut the hay out with the air.  
Or, cut the belts pull them out with the loader and re-splice.  I did 
not blow off the baler last time i used it, it was trying to rain after 
I put the new bearing in that was causing the fires.  The hay builds up 
in the back above the top of the bale chamber, and causes the belts to 
stick.  Really dry hay is the worst problem...


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