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post #1 of 194 Old 10-27-2014, 06:03 PM Thread Starter
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CCKA Rebuild

Couple questions:

1. Is the botton of the cylinder supposed to be pitted?

2. Are the valves supposed to have grooves?

This is the 1973 816 limited slip with steering brakes I picked up that had the broken shifter fork. After replacing the shifter fork I used it to mow the grass, 3-4 acers. I started to notice it used oil and had noticeable blow by, also I couldn't keep the oil clean. This model cck has the breather straight to atmosphere which makes the blow by more noticeable, not so much visually but you could smell burnt oil. Other than that, it honestley ran great. Knowing it was pretty worn out I imagined some wear inside but was surprised to see the pittting and worn valves.

If it had enough power to swing a 50" deck and pull a 60" tow behind in this condition I cant wait to see what it is like rebuilt!
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post #2 of 194 Old 10-27-2014, 07:26 PM
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Re: CCKA Rebuild

no and no

It is hard to tell what condition the valves are in. It is possible that what you are seeing is just deposits.

Looks like you will need to have the block bored to get rid of the pitting.

Code:
                              Current Inventory
   24G (Onan 24hp)    24GLX - was 16G  (Onan 24hp)   8249 - was 8129 (Onan 24hp)
        818T (Onan 18hp B48)       8163T - was 8123 (Onan CCKA) 
                              8183T (Onan B48)
   5665 w/brakes        5665        5660        Pro-8         Pro-16 w/brakes

For Gravely Manuals and more visit http://GTCOA.com
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post #3 of 194 Old 10-27-2014, 08:46 PM
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Re: CCKA Rebuild

The pitting may be "optically" deep,,,,, I would hone it before I bored it.

The pitting might only be 0.001" deep,,,, honing would "fix" that!!

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post #4 of 194 Old 10-27-2014, 09:40 PM
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Re: CCKA Rebuild

Quote:
Originally Posted by CADplans View Post
The pitting may be "optically" deep,,,,, I would hone it before I bored it.

The pitting might only be 0.001" deep,,,, honing would "fix" that!!
I agree. I have seen scored cylinders clean up nicely with a good honing. True enough, you only get to do it once, but I always think it better to do the least first and escalate only as necessary.

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post #5 of 194 Old 10-27-2014, 10:08 PM
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Re: CCKA Rebuild

Time to measure the bore. No sense in honing if the bore is already worn out of spec.

Code:
                              Current Inventory
   24G (Onan 24hp)    24GLX - was 16G  (Onan 24hp)   8249 - was 8129 (Onan 24hp)
        818T (Onan 18hp B48)       8163T - was 8123 (Onan CCKA) 
                              8183T (Onan B48)
   5665 w/brakes        5665        5660        Pro-8         Pro-16 w/brakes

For Gravely Manuals and more visit http://GTCOA.com
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post #6 of 194 Old 11-04-2014, 01:47 PM Thread Starter
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Re: CCKA Rebuild

Finally had some time to finish taking things apart. I will be taking everything in to be measured up and get the diagnosis.

I will report back after.
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post #7 of 194 Old 11-04-2014, 01:49 PM Thread Starter
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Re: CCKA Rebuild

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post #8 of 194 Old 11-04-2014, 03:59 PM
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Re: CCKA Rebuild

Be sure to bring a copy of the dimensions and tolerances from the manual.

Code:
                              Current Inventory
   24G (Onan 24hp)    24GLX - was 16G  (Onan 24hp)   8249 - was 8129 (Onan 24hp)
        818T (Onan 18hp B48)       8163T - was 8123 (Onan CCKA) 
                              8183T (Onan B48)
   5665 w/brakes        5665        5660        Pro-8         Pro-16 w/brakes

For Gravely Manuals and more visit http://GTCOA.com
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post #9 of 194 Old 11-04-2014, 04:00 PM Thread Starter
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Re: CCKA Rebuild

Thanks Richard thats a good reminder!
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post #10 of 194 Old 11-04-2014, 09:53 PM
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Re: CCKA Rebuild

Looks like a fun project I need to do the same with mine. I bought a digital dial bore indicator so I can measure my own bores. It comes in very handy....
post #11 of 194 Old 11-04-2014, 09:58 PM Thread Starter
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Re: CCKA Rebuild

Where did you get the digital dial bore indicator from? Was it expensive?
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post #12 of 194 Old 11-04-2014, 10:08 PM
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Re: CCKA Rebuild

I almost bought a bore indicator until I realized that it really didn't do what was needed. A bore indicator is OK but it won't tell you if the worn bore is elliptical and by how much which most are. You can't get a good ring seal if the bore is egg shaped.

This is what I use. Takes a little more finesse to use but you know what you have when you are done.

2"-12" inside micrometer from Fowler. About $100. Includes standard.

Code:
                              Current Inventory
   24G (Onan 24hp)    24GLX - was 16G  (Onan 24hp)   8249 - was 8129 (Onan 24hp)
        818T (Onan 18hp B48)       8163T - was 8123 (Onan CCKA) 
                              8183T (Onan B48)
   5665 w/brakes        5665        5660        Pro-8         Pro-16 w/brakes

For Gravely Manuals and more visit http://GTCOA.com

Last edited by Richard-tx; 11-04-2014 at 10:18 PM.
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post #13 of 194 Old 11-05-2014, 05:55 AM
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Re: CCKA Rebuild

My digital bore indicator works great. It will measure run out etc like the post above mentions. You Ali need a micrometor to calibrate it. The dial indicator was around $100 I think I either got it on eBay or amazon..
post #14 of 194 Old 11-05-2014, 06:01 AM
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Re: CCKA Rebuild

Here it is. It's only $50 now. You need to get a 3-4" micrometor to set this two. For example you need to set it to a known value. If your bore is 3.25" you start by setting the indicator to 3.25". I should make a video of how to use it....

Http ://www.ebay.com/itm/330880385983
post #15 of 194 Old 11-05-2014, 07:51 AM
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Re: CCKA Rebuild

That would work. I was referring to the 3 legged variety. Those won't work.


Code:
                              Current Inventory
   24G (Onan 24hp)    24GLX - was 16G  (Onan 24hp)   8249 - was 8129 (Onan 24hp)
        818T (Onan 18hp B48)       8163T - was 8123 (Onan CCKA) 
                              8183T (Onan B48)
   5665 w/brakes        5665        5660        Pro-8         Pro-16 w/brakes

For Gravely Manuals and more visit http://GTCOA.com
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