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1. 03:27 PM - Dieseling 912 UL Engine (Hugh McKay)
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| Subject: | Dieseling 912 UL Engine |
I know this subject has been commented on before, but here is my
situation. My 912 UL has 504 hours and has begun to diesel on shutdown.
I have never had this problem since I have had the engine. Bought it new
in 2007. It starts fine, runs fine and idles fine. Shut down is at 1800
rpm. It just does not want to stop rotation. It does not rotate
backwards, it just seems to want to continue to run after I kill both
ignition circuits. I have checked and changed the plugs without any
change. However, I have noticed that when I do a =9Cmag
check=9D at 4000 rpm I only see a very slight drop, (< 100 rpm) if
any on the tac. I used to see 100 to 150 rpm drop. Could I have a
=9CHot=9D circuit and not know it? How can I check the
ignition circuits? I am going to change fuel also and see if that may be
the problem. The temperature here in NC is now in the 80s (degrees F),
and I am running 87 MOGAS (with 10 % ethanol) currently, but will switch
to 93 MOGAS (no ethanol) to see if that makes a difference. Has anyone
else experienced this? Dick Maddux, I know you had a problem some what
like this, but don=99t remember what solved your issue.
Hugh G. McKay III, P.E.
Allegro 2000
Rotax 912 UL
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