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Onan 605 MCCK not cranking/starting


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  #1  
Old 03-21-2017, 05:47:40 AM
bwilkinson bwilkinson is offline
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Default Onan 605 MCCK not cranking/starting

I have an Onan 605 MCCK - 3R71B marine generator. I have used it 4 years with no problems at all. Last week I went to start it and it would only turn over 1 revolution and then the solenoid would just click. After it sits for a few minutes it will turn over just 1 revolution and start clicking again. After doing some searches I have determined that my generator is the type that uses the generator as a starter instead of having a separate starter motor. My questions are 1- How hard is this to troubleshoot/repair? 2- can it be converted to a normal type starter motor and if so how? I have never worked on this or any generators before. Until recently all I have ever had to do is keep the oil changed. Thanks for any info and help. 605MCCK-3R71B Ser # 0568039160 Gen Data # 5MCCK3C1A
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Old 03-21-2017, 08:27:41 AM
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Billy J Shafer Billy J Shafer is offline
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Default Re: Onan 605 MCCK not cranking/starting

Go back to the brushes. The first near the engine are the starter brushes. Make sure they are free in the guides and the rings are clean. You need to do this to all the brushes.
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Old 03-21-2017, 09:10:10 AM
bwilkinson bwilkinson is offline
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Default Re: Onan 605 MCCK not cranking/starting

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Originally Posted by Billy J Shafer View Post
Go back to the brushes. The first near the engine are the starter brushes. Make sure they are free in the guides and the rings are clean. You need to do this to all the brushes.
Thank You so much for the reply. What is the best way to clean the rings?
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Old 03-21-2017, 09:50:30 AM
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Default Re: Onan 605 MCCK not cranking/starting

You can use a scotch brite pad. If not running you can rub the rings with the pad. Some fine sandpaper but nothing with metal in it. Then blow it all out with air.

I prefer to use a brush stone. Long enough to use with engine running. Carefully lay the stone on the ring. Let it ride on the ring. You will see the ring change color. Not to much pressure as the stone can break. Any good electrical shop or rewind shop should have them.

Also make sure your battery is in good shape.
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Old 03-21-2017, 09:58:01 AM
Kevin K Kevin K is offline
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Default Re: Onan 605 MCCK not cranking/starting

It is very important to have a fully charged high capacity battery to crank any of the exciter cranked generators. That is the first thing I would check. It sounds like your battery just is not up to the task any longer. Also check the battery terminal connections.

You can download the manuals for your MCCK here:
http://www.twinslan.net/~n0nas/manuals/onan/

927-0221 Parts
927-0350 operator
927-0550 Service
932-0405 Marine Master Service Manual
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Old 03-21-2017, 10:29:27 AM
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Default Re: Onan 605 MCCK not cranking/starting

Kevin is correct. It does take a good strong battery. Just as it requires a good brush system. You should check the brushes at least once a year. A stuck brush can turn into a cutting torch. I have an AJ in my shop. Brush stuck cut a deep track through the AC ring. Can't be repaired. New ring assembly and labor,brush holder. 500.00 dollars because he never checked the brushes.
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Old 03-21-2017, 11:13:50 AM
bwilkinson bwilkinson is offline
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Default Re: Onan 605 MCCK not cranking/starting

Sorry if this is a dumb question but can I check the brushes and ring without separating generator from the motor? I tried using jumper cables and jumping it from a new battery in the engine compartment. I have pulled the generator and have it at home. I will hook it up to a new battery tonight after checking the brushes. Hopefully it will crank. Again thanks for the feedback and links to manuals.
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Old 03-21-2017, 11:24:40 AM
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Default Re: Onan 605 MCCK not cranking/starting

No need to pull it apart. The manual will show you how to check everything.
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Old 03-21-2017, 05:50:02 PM
bwilkinson bwilkinson is offline
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Default Re: Onan 605 MCCK not cranking/starting

Got home from work read the manuals made sure brushes were seated and cleaned the rings. Hit the starter switch and it cranked and started just from the gas sitting in carb. Pulled the battery out of my truck and it cranked over like a champ. Thanks for all your help. So glad to have found this forum. Great to be able to keep old equipment like my generator running with help of forums like this.
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Old 03-21-2017, 06:00:14 PM
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Default Re: Onan 605 MCCK not cranking/starting

Now you will have to explain to everyone why you are hunting old Onans. Once you get hooked there is no cure.
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