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THEMA: Starting-problems with hot engine

Starting-problems with hot engine 4 Jahre 1 Woche her #81

  • D-EMMK
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We also had a lot of problems with our hot IO360. Finally I found on Mooneyspace a procedure which works always on our M20J:

Throttle full forward
Mixture full forward
Engage the starter for round about 10 sec. The engine will not start at this time. Keep the starter engaged and pull the mixture totally lean, pull the throttle out ( apr. 1200 RPM ). After the several blades the engine will start. Then move the mixture full rich. For us, it works for 100 percent, but it takes some time and is with a copilot much easier. No boost pump at all.

Best regards
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Starting-problems with hot engine 3 Jahre 11 Monate her #82

  • EDNR-Cruiser
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Sounds like the "David McGee procedure" with a 10 seconds foreplay to me... B)
Good if your battery and starter are willing to comply... ;)
Mooney M20F Executive 21, 1966, D-ECED
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Starting-problems with hot engine 3 Jahre 11 Monate her #85

  • AnthonyQ
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After getting advice from every source I could think of, including this forum, I think I may have finally cracked it! So far 4 successful hot starts in succession....there will be another one tomorrow so here's hoping...
AnthonyQ M20J 205 N60GZ
(A displaced Australian living in Scotland!)
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Starting-problems with hot engine 3 Jahre 11 Monate her #86

  • EDNR-Cruiser
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If you would be so kind to share your experience with this forum now... :dry: :) :whistle:
Mooney M20F Executive 21, 1966, D-ECED
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Starting-problems with hot engine 3 Jahre 11 Monate her #87

  • AnthonyQ
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Ok, what has worked for me (four times at least) is:

1. Run the engine at 1200 rpm before shut down and then leave the throttle in that position
2. Before hot starting move the mixture forward for around 30 seconds before returning it to Idle cut-off (I'm not sure that this actually does anything, but I guess it doesn't hurt)
3. Crank with right hand on mixture
4. After about 4 seconds begin moving the mixture in very slowly until it begins to fire
5. As soon as it fire quickly move the mixture forward to within an inch or so of full (this is the critical part....too slow and the engine will not catch)
6. Be ready to move the throttle a little to keep it running (although this has only been required on one of the four successful starts)

This is pretty much the procedure you describe above, so thanks EDNR for your help!

The other day at LFBI after refueling another plane pulled up to the bay so the pressure was on to start and move out of the way....it started perfectly but then I noticed that I had forgotten to close the oil filler opening and my wife was not keen on reaching forward to close it with the engine still running so I had to shut down....but it started again perfectly! I was very relieved....

A question I asked on Mooneyspace was: how long after shut-down do I need to transition from the hot-start procedure to the cold-start procedure? There was no clear answer....but I would guess after 30 or 40 minutes
AnthonyQ M20J 205 N60GZ
(A displaced Australian living in Scotland!)
Letzte Änderung: 3 Jahre 11 Monate her von AnthonyQ.
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Starting-problems with hot engine 3 Jahre 11 Monate her #88

  • EDNR-Cruiser
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Very difficult to answer... - depends on outside air temperature, wind and how hot your engine ran before you shut it down.
I usually apply me hot start procedure until up to 2 hours after shut off and it works most of the time.
If the engine doesn't even cough after 20 secs of high temp start procedure I stop cranking the engine, open the mixture and throttle for about a minute (minimum) and then begin follow the cold start procedure which unfortunately doesn't work either in most of the cases which then leads to the flooded engine procedure (throttle full in, mixture full lean)...
Mooney M20F Executive 21, 1966, D-ECED
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