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Agco Allis 2025 shutdown procedure

E

elkcagg

Member
Well earlier on this forum I seen a " backfire on shutdown " post which triggered these thoughts I've had for several years. The owners manual states to have rpms no lower than 2000 rpms when shutting off engine or engine damage may occur. Seems rather high huh? This goes against the way I've shut off any engine in all my years. Is it to prevent detonation or run-on? Seems like more chance of bringing in more unburned fuel for more backfire, but whatever.... If I burn 87 octane crap gas I get backfire & run-on at any speed shutting off. When I use 91 octane no ethanol it's better. It has the 25 hp Kohler twin cylinder engine.
 
Be interesting to know what kind of engine damage they are talking about. I've always been a believer in idling down any engine before shut down.

I've never heard or checked, but I wonder what the temperature does on an air cooled when shut off? Seems it would go higher by shutting down immediately after a hard run. But if it were idled would it still heat up due to less air flow? Better to overheat idling or stopped?

I remember seeing a factory tag on some old equipment, cast iron Wisconsin, Kohler,?, said to "Idle engine x minutes before shut down". Evidently they believed better to cool down before shutting off...
 
HUH? I've always been a fan of idling them a bit before I shut them down, if nothing else the oil temperature starts to drop a bit leaving less chance for hot oil to burn and turn into ash or other microscopic abrasive particles in places you don't want. Maybe they're afraid of un-burned gasoline laying in the cylinder and messing up the oil?
 
The "engine damage they are talking about" is blown head gaskets and also the possiblilty of a warped exhaust valve.
I have seen several engines with blown head gaskets that I suspect were caused by an explosion in the muffler, That backfire is an uncontrolled explosion and the pressure has to go somewhere. I have also seen some mufflers that were deformed that I suspect were victims of that too.

What I tell all my customers is to keep the throttle wide open and just turn the switch off.

What you are trying to do is keep the exhaust gas moving fast enough that it flows on through the muffler after you cut the spark off before it can explode due to the muffler being so hot.
 
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