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Bus Discussion => Bus Topics ( click here for quick start! ) => Topic started by: CraigC on January 23, 2008, 03:52:35 PM

Title: Help-Changing starter rotation
Post by: CraigC on January 23, 2008, 03:52:35 PM
Does anyone know what it takes to change the rotation of a Delco 42MT from a CW to a CCW rotation.
I assume it is just a rewire between the brushes and the field coil or a brush plate change and changing the 11 tooth gear in the bendix. Is the bendix gear from a 40MT starter a direct replacement. Are these the only 2 changes needed?
Thanks for any input.
Title: Re: Help-Changing starter rotation
Post by: gomer on January 23, 2008, 07:14:46 PM
craig,  My advice is take it to a rebuilder and have them reverse the rotation if it can be changed.  I think that some can and others can't.   ???
Title: Re: Help-Changing starter rotation
Post by: CraigC on January 23, 2008, 09:12:55 PM
Thanks Gomer.
The two re builders I have used for the last 35 years, one has down sized and does not have anyone left that knows how and the second is out of business.
I have not bought a MT42 yet. I want to change from a 40MT. If I already had a 42MT I would already have it apart. I want to understand what makes it tick. I could take a spare 40 apart to see how to change the rotation. I have converted single directional DC motors to bidirectional, so can figure it out.
Just thought someone might know the answers.
Thank you for looking.
Title: Re: Help-Changing starter rotation
Post by: Barn Owl on January 23, 2008, 09:35:15 PM
Craig C,

I would love to see some pics and a description of your 4104. 8V71TA V730 conversion sounds very cool.

Laryn
Title: Re: Help-Changing starter rotation
Post by: TomC on January 24, 2008, 12:09:30 AM
As I understand it, CCW starter has a different armature and bendix gear drive.  In other words, best to just buy a CCW starter right off.  42MT is good to 14.8 liter engine.  Good Luck, TomC
Title: Re: Help-Changing starter rotation
Post by: makemineatwostroke on January 24, 2008, 05:49:19 AM
Craig,the armature has a different spline twist for the bendix drive on cw and ccw starters,the older ones had a straight spline
Title: Re: Help-Changing starter rotation
Post by: CraigC on January 24, 2008, 10:56:15 AM
 Tom and 2 stroke that is the info I was looking for. Thank you!

Barn Owl, I sent you a private message.
Title: Re: Help-Changing starter rotation
Post by: junkman42 on January 25, 2008, 06:58:14 AM
Craig, try www.waiglobal.com.  They have new starters for less than 300.oo.  I bought a brand new starter for a perkins diesel for less than the price of a rebuild.  John
Title: Re: Help-Changing starter rotation
Post by: TomC on January 25, 2008, 08:03:09 AM
After looking at WAI Global at the starter parts, the gear drive, armature AND field windings are different between CW and CCW- in another words except for the case and bendix solenoid, everything is different between the two rotations.  Not quite like a 3 phase motor that can be reversed by switching two of the wires.  Good Luck, TomC
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