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Old 19-04-2016, 11:41   #16
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Re: Rotate diesel engine in reverse?

Quote:
Originally Posted by dlymn View Post
monkey wrench or vice grips on shaft and resting on a board for weight distribution. Longish piece of pipe on the spanner on the wrench. penetrating oil on thread. Should work. Check that the washer under the nut hasn't been bent up to lock the nut.
NOOOOO!!!! Why damage the shaft

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Originally Posted by Wanderlust View Post
Try an alternate solution.

Put the prop back on and place a block of wood between a prop blade and the hull. Then go back inside and try the nut.
This works fine and best with 2 people.

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Originally Posted by Jim Cate View Post
If you have the starter off, it is often possible to jam a screwdriver into the ring gear on the flywheel to lock up the crank.

Jim
Good possibility in snapping off a tooth and then you're screwed.

To the OP...You're on the right track with an impact driver. Use a 1/2" drive, gun type and as much air pressure as possible. Because of the snap effect of the impact, you should easily be able to shoulder the prop and impact the nut off. Make sure the rotation is correct before doing this and again, 2 people.
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Old 20-04-2016, 08:12   #17
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Re: Rotate diesel engine in reverse?

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Originally Posted by Martkimwat View Post
I have had my 1GM10 Yanmar start in reverse by accident a couple of times, I quickly stopped it then restarted it normally, doesn't seem to have done any harm but only running for couple of seconds. Nonetheless it probably did a hundred or more revolutions before shutting down, therefore the one or two revs that the impact wrench might induce is not likely to cause any issues IMHO.
Right out of high school I had a friend who thought he was "all that" and just had to have a Mercedes Benz. He could only afford an old one and it had that 5 cyl diesel engine. One day the battery was dead and he had a friend help him push start the car. Problem was he had it in reverse, accident or stupid???, and by golly the car started!

Everyone is correct, it won't pump oil when running backwards; much to my friend's dismay. That was a very costly day for him.
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