Cruisers Forum

Join CruisersForum Today

Thread Tools Rate Thread Display Modes
Old 19-04-2016, 10:41   #16
Registered User
Celestialsailor's Avatar

Join Date: Nov 2006
Location: In Mexico, working on the boat
Boat: Hallberg Rassy 35. and 14ft.Whitehall pulling skiff.
Posts: 8,018
Images: 5
Re: Rotate diesel engine in reverse?

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

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.

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.

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.

"Life is not a journey to the grave with the intention of arriving safely in a pretty and well-preserved body, but rather to skid in broadside, thoroughly used up, totally worn out, and loudly proclaiming: Wow - what a ride!"
Celestialsailor is offline   Reply With Quote
Old 20-04-2016, 07:12   #17
Life is good!
SV Bacchus's Avatar

Cruisers Forum Supporter

Join Date: Apr 2016
Location: Presently in the Bahamas
Boat: Leopard 42 OV
Posts: 901
Re: Rotate diesel engine in reverse?

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.

SV Bacchus - spreading libations world wide, via sailboat, to help the "up tight" relax and enjoy life!
SV Bacchus is offline   Reply With Quote

diesel, engine, rot

Thread Tools
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
Which engine oil to use on BMW D12 marine diesel engine gawie Engines and Propulsion Systems 19 17-12-2015 17:00
Rotate batteries. Good idea or not? bytownboy Electrical: Batteries, Generators & Solar 1 25-02-2015 12:17
Reverse Polarity (AC) GordMay Electrical: Batteries, Generators & Solar 13 30-06-2013 12:12
Reverse Osmoses. Alan Wheeler Provisioning: Food & Drink 4 11-04-2005 19:51

Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 09:00.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2018, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2018, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.