My 360 Engine is running reverse once turn off.

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I work on boats for a living
And have had a few Engines run on/diesel
And yes they do go from running std. Rotation to counter rotation sometimes when you shut the key off until they knock, clatter, bang, fart and die...lol
Usually overheating, bad gas or timing most common.
Of course this doesn't only happen to boats just my experience being next to a Engine watching it.
Harder to see in a car..

I had a outboard run away on the hose
Revved to the moon!
From carbon build up in the cylinders
Could not shut it off!
It was spinning over 8000 rpms and I pulled all the plug wires, still wouldn't die
Until I shoved rags into the carbs.
Kinda scary being right next the flywheel
With a motor screaming like that.
 
When you shut it off and the piston is coming up the bore it has a charge of fuel & if the idle is set too high it will also have a good charge of fresh air if the head is too hot it will combust without the need of a spark as there is not enough momentum to carry it through forward rotation the piston is forced back down the bore in reverse.
Have seen this on new engines without carbon buildup .If my engine is extremely hot enough to cause preignition i leave the auto in drive with my foot on the brake at idle then turn the key off it causes the engine to lose rotation more rapidly
 
I agree heat and/or excessive carbon build up could be causing dieseling, but kickback is 100% timing.
 
At that point standing next to it you just start going through the list of things the engine needs to run. Of course doing anything to the ignition will probably not do anything to stop it, but its on the list.
 
In the same yard we had an old oyster boat with a 3 cylinder Wolverine diesel. Made 75 HP each cylinder was a foot in diameter. To start you light a piece of clothesline on fire and wedge it in a screw in plug. Screw all three in and bump it over with bumping pry bar. Then hit the air starter. It idled at like 10 rpm. It had a board you could rotate over the air inlet if it started to runaway. Running normally it was scary to stand next to.
 
furrystump said:
In the same yard we had an old oyster boat with a 3 cylinder Wolverine diesel. Made 75 HP each cylinder was a foot in diameter. To start you light a piece of clothesline on fire and wedge it in a screw in plug. Screw all three in and bump it over with bumping pry bar. Then hit the air starter. It idled at like 10 rpm. It had a board you could rotate over the air inlet if it started to runaway. Running normally it was scary to stand next to.
Click to expand...
Ever hear of a "fendt" tractor?

Single cylinder diesel, would idle at about the same rpm...here's one


 
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