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Onan 4.0 CCK Spec V


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  #1  
Old 09-18-2017, 04:35:20 PM
reid070 reid070 is offline
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Default Onan 4.0 CCK Spec V

Brought this one home a couple of days ago. The set is in great shape and came with every thing to set in up. Exhaust flex, nice muffler, nice stand, kn demand regulator , shut off solinoid and ducting for the vacuflow. Seller also had a spare set of points , a condenser and operators manual.
Started it up and ran in for 1/2 hour today, and found a few issues. Has a bad oil leak on top of the engine,looks to be coming from around the mechanical fuel pump. Kinda looks like manifold removal will be necessary to do something about it.
Next issue was battery charging. I checked after starting and it was 12.8v. After running for 20 minutes I checked again and it was 15.9v. That can't be to good for the battery. I did a little research and it seems like maybe this is how these sets operate , but doesn't seem right to me. I haven't been able to find a service manual for spec v or wiring diagram.
I know everybody likes pictures so here are some from my phone
Thanks Steve
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Old 09-18-2017, 05:48:03 PM
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Default Re: OnN 4.0 cck spec v

For the oil leak. Check the breather valve in the pipe sticking up from the block. Clogged up and it will cause oil leaks. I would check the bolts holding the pump down. Some times they get loose. I think I have a print for it.
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Old 09-18-2017, 07:12:39 PM
reid070 reid070 is offline
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Default Re: OnN 4.0 cck spec v

Thanks Billy , I had read about the breather in other threads. I took mine out and it was free ,although fairly oily. More oil than I would like to see there. Other threads said that this could also be replaced upside down? I can't see how on this model, it only goes in 1 way. Guess the design was improved over the years.
Yeah I want to check the bolts on fuel pump but it looks almost impossible to get at them without removing the manifold
Steve
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Old 09-18-2017, 07:27:44 PM
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Default Re: OnN 4.0 cck spec v

One of the newer CCK's we have seen. Can you take a picture of inside the control box. I believe that has the 2 stage charging.
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Old 09-18-2017, 07:58:54 PM
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Default Re: OnN 4.0 cck spec v

MBB here are the pictures of the control box. And one of the oil leak suspect area. The red wire is the power to the propane solinoid, the green wire with the red tape is I believe for the choke , which has been removed. This set spent its whole life on propane.
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Old 09-18-2017, 08:07:52 PM
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Default Re: OnN 4.0 cck spec v

Quote:
Originally Posted by reid070 View Post
I did a little research and it seems like maybe this is how these sets operate , but doesn't seem right to me. I haven't been able to find a service manual for spec v or wiring diagram.
Thanks Steve
Manuals are as follows:
927-0122 Operators
927-0222 Parts
927-0754 Service Engine
900-0196 Service Gen
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File Type: pdf 611-1142.pdf (164.4 KB, 17 views)
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Old 09-18-2017, 08:21:11 PM
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Default Re: OnN 4.0 cck spec v

In your first picture the silver box is the 2 stage charging regulator. Its been a while but if you remove the cover I believe you can adjust the output. It probably is in the manual. I have one on my 4.0CCK as well I believe mine outputs 14.8V. I never felt the need to adjust it. It will reduce when the battery gets near full charge.

Here are the manuals.

Operators
https://quickserve.cummins.com/cpgfi..._I1_198010.pdf

Parts
https://quickserve.cummins.com/cpgfi..._I4_199107.pdf

Wiring Diagrams (page 63 I believe)
https://quickserve.cummins.com/cpgfi..._I1_201202.pdf

I will dig up the other.
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Old 09-18-2017, 08:26:43 PM
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Default Re: OnN 4.0 cck spec v

Thanks for the help MBB. Perhaps I didn't run the set for long enough for the charging rate to drop down. I shut it down after I spied the oil leak. I'm also thinking the battery maybe have been slightly run down as I was using on my 1.0 aj while working on the propane system , and had lots of starts and stops
Steve
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Old 09-18-2017, 10:26:31 PM
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Default Re: OnN 4.0 cck spec v

You do have the two stage charging if it is hooked up right. Check that the fuel pump isn't leaking at the pivot pin for the diaphragm on the fuel pump. The bolts are 12 point and if you have a set of 1/4" drive sockets, you can get one in there or use a 12 point box wrench. Don't tighten them too tight or you will warp the pump base.
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Old 09-18-2017, 11:18:17 PM
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Default Re: Onan 4.0 CCK Spec V

that's a pretty clean set. I'm jealous.
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