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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
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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
reid070 reid070 is offline
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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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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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Old 09-19-2017, 06:55:56 AM
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Default Re: Onan 4.0 CCK Spec V

Quote:
Originally Posted by slip knot View Post
that's a pretty clean set. I'm jealous.
Yes it's in great shape, I couldn't say no to this one. Pretty unusual for around here, great shape and a reasonable price. Surprisingly it sat on Kijiji for 3 weeks while I was away at work with only 1 other caller who never called back! Lucky for me.
Seller is retired electrician who removed it for a customer ( they replaced it with a new kohler). He said it spent its life in a heated building connected to a transfer switch, so not likely many hours.

Steve
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Old 09-19-2017, 08:26:28 PM
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Default Re: Onan 4.0 CCK Spec V

Ran set for awhile today , charging voltage settled down to 13.8volts so looks like that's working ok. Oil leak looks to be coming from piviot pin on fuel pump. Pin was sticking out 1 side ,pushed it back in flush still leaking though. I was able to get a wrench on 1 of the mounting bolts ,it was snug.
Any of the manuals and wiring diagrams I've been able to grab only go to spec u. I can't find anything that mentions spec v?or is there no real difference ?
Thanks Steve
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Old 09-19-2017, 11:19:15 PM
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Default Re: Onan 4.0 CCK Spec V

With the fuel pump pin in proper place, get a small center punch and stake around the aluminum to hold the pin in place. Clean around the pin and casting with some lacquer thinner and let dry. Put some silicone sealer around the pin and let it set up for a day or two. should stop or at least slow it down.
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Old 09-20-2017, 11:34:34 AM
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Default Re: Onan 4.0 CCK Spec V

Regarding manuals the index lists those manuals for spec v also. I would say then little difference.
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Old 09-23-2017, 07:24:49 PM
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Default Re: Onan 4.0 CCK Spec V

Had some time with this one today. Decided to do a compression test ,before I warmed up the set and changed the oil. Surprise ! 140 psi . I had recently read Johnnyc's thread on his former cck set and the debate about high comp heads. Looked at all the pic's I could find of the raised bump on the head that indicates high compression . Looking at my set ,nope no raised bump.
So... I had to know for sure , off with the heads. And they are absolutely high compression . And I found the raised area,but not in the spot shown in other threads. The raised area on my heads is on the top horizontal cooling fin almost out of sight under cooling tin. The pictures of other heads show the hump on the last vertical cooling fin near the plug.
Interesting stuff to me anyway, as I didn't think(from what I have read here) a tri fuel cck would have used the high compression heads.
The part #'s on the heads were170 0732 and 170 0733. An other thread by Kevin K shows these part #'s as ccka heads? Pretty sure this cck has never been apart before. I wonder does it show the type of head on a build sheet?
Steve

---------- Post added at 08:24:49 PM ---------- Previous post was at 08:11:14 PM ----------

Whoops sorry I screwed up those part #s should be 170 3071 and 170 3072.
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Old 09-23-2017, 07:32:44 PM
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Default Re: Onan 4.0 CCK Spec V

This should be your production order. Sometimes they used the older -3CR designation instead of the newer FJ.

Are you running on gasoline or propane? I tried a set of high compression heads on my gasoline fueled 5CCK and got readings of 145 to 150PSI. I thought that may be a bit high for our crappy ethanol gasoline, so I put the standard heads back on. I usually use non ethanol high test, but in a long duration power outage I am concerned it may not be available.
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Old 09-23-2017, 07:34:10 PM
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Default Re: Onan 4.0 CCK Spec V

In this picture from onan parts you can see the raised area where I was expecting to find it.
On mine it was instead (looking at the combustion chamber) on the top to the left of the spark plug hole. Also it was not nearly as pronounced .
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Old 09-23-2017, 07:36:25 PM
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Default Re: Onan 4.0 CCK Spec V

I have one set of high compression heads without the raised area. Go figure...
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Old 09-23-2017, 07:40:51 PM
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Default Re: Onan 4.0 CCK Spec V

Thanks Kevin. I haven't tried it on gasoline yet , but I would like to be able to run it on gasoline. One of the thing I did today was set the timing back to 21 degrees , it was at something that didn't even line up with my timing marks (they stop at 22°) judging by the distance above the last mark it was probably >26°.
Steve
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Old 09-23-2017, 08:01:14 PM
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Default Re: Onan 4.0 CCK Spec V

Advancing the timing is a good idea when running on propane, a slower burning fuel. You have to make sure to set it back to standard before running on gasoline. Mark the original timing adjustment so you can reset it if needed. I think standard was 0.020" on the points, which gives you 19 degrees BTDC. The spark plug gap is listed as 0.018" on propane, and 0.025 inches on gasoline.
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