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post #181 of 194 Old 05-07-2015, 10:51 PM Thread Starter
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Re: CCKA Rebuild

Attorney Molly had a long day at work...
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post #182 of 194 Old 05-07-2015, 10:54 PM
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Re: CCKA Rebuild

Very cool. Now if you could have gotten Molly to wear dress up ready-for-dinner-at-the-Country-Club clothes you would have made the original Ad, Gravely might have envisioned!

Did you ever notice in their brochures from that time the operators were somewhat over dressed. Great looking 816 Steve.

“Failure is simply the opportunity to begin again, this time more intelligently.”- Henry Ford

1992 - 20G-Kohler Magnum Twin (KMT) M20 big Red
1981 - 8183-repowered w/97 M18S 'lil Red
1972 - 816-repowered w/92 M18S 'lil white
1987 - Pro-12 Mr. Lucky
1984 - 8122 to get a diffrnt K301 soon.
1982 - 8123 Fred's Tractor an adoptee
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post #183 of 194 Old 05-07-2015, 11:02 PM Thread Starter
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Re: CCKA Rebuild

Yeah Im probably not going to mention that to her tonight lol. But I have seen those old brochures and know what you mean.
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post #184 of 194 Old 05-09-2015, 07:25 PM
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Re: CCKA Rebuild

That thing really plows through that thick tall grass good
post #185 of 194 Old 06-29-2015, 08:39 PM Thread Starter
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Re: CCKA Rebuild

A little operating experience for my Tractor Forum buddies.

There is always time to do the job right the first time.

So I was going to change the spark plug and thought I'd move the pebble after I got the plug out. I should have taken the 45 seconds it would have taken to walk over to the tool box and grab the needle nose pliers.

The pictures will show the pebble I dropped in the spark plug hole.
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post #186 of 194 Old 06-29-2015, 09:47 PM
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Re: CCKA Rebuild

It certainly could have been far worse. And think of all the fun you had digging it out! All that fun wrench turning. Using tools and stuff. Torque wrenches. Ratchets. All the while thinking about what you REALLY needed to be doing.


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Gravely 16G (1998)
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post #187 of 194 Old 06-29-2015, 10:07 PM
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Re: CCKA Rebuild

That sucks !!!! I dropped something in the intake manifold once with the carb off and had to remove the intake to get it out. I feel your pain...
post #188 of 194 Old 06-29-2015, 10:16 PM Thread Starter
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Re: CCKA Rebuild

One thing I was suprised to see was the cross hatching from when I rebuilt it 30+ hours ago, figured it would have been long gone. I'd a thought it would have been totally worn in by now. Guess that's a benefit of running Royal Purple. I wonder if I will be around for .020 over?
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post #189 of 194 Old 06-29-2015, 10:18 PM Thread Starter
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Re: CCKA Rebuild

Ralph unfortunately I'm a repeat offender, one time I dropped a socket in the intake of my Ford 6.4 that was a 3 day mistake
Had to unbolt and raise the body off of the truck. I like working on the Gravelys much more.
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post #190 of 194 Old 06-30-2015, 10:06 AM
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Re: CCKA Rebuild

Quote:
Originally Posted by SteveSWMI View Post
One thing I was suprised to see was the cross hatching from when I rebuilt it 30+ hours ago, figured it would have been long gone. I'd a thought it would have been totally worn in by now. Guess that's a benefit of running Royal Purple. I wonder if I will be around for .020 over?
The crosshatching is a matter of wear and the grit size of the hone used. The more the bore wears the less there is. I have seen crosshatching on engines that have well over 1000 hours on them.

The quality of oil has something to do with it.

Personally I don't like RP oil despite the fact they the brand has been around since the mid 80s. Royal Triton was another purple oil that was around in the 1960s.

Crosshatching is all but gone on modern automotive engines. The makers use a microhoning technique that all but eliminates break-in time. Since the honing is so fine, the crosshatching goes away quickly and the rings seat in seconds, not hours.

I have replaced rings on a couple of Onan engines and used a 600 grit hone. It took about one minute for the rings to seat.

The other factor is the type of cast iron that Onan used for their cylinders. A cheap cast will wear quickly. Onan was apparently very specific what cast iron was used. As a result, if you keep the oil changed, the engine will last a very long time as evidenced here.

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; 06-30-2015 at 10:15 AM.
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post #191 of 194 Old 06-30-2015, 02:28 PM
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Re: CCKA Rebuild

Quote:
Originally Posted by Richard-tx View Post
The crosshatching is a matter of wear and the grit size of the hone used. The more the bore wears the less there is. I have seen crosshatching on engines that have well over 1000 hours on them.

The quality of oil has something to do with it.

Personally I don't like RP oil despite the fact they the brand has been around since the mid 80s. Royal Triton was another purple oil that was around in the 1960s.

Crosshatching is all but gone on modern automotive engines. The makers use a microhoning technique that all but eliminates break-in time. Since the honing is so fine, the crosshatching goes away quickly and the rings seat in seconds, not hours.

I have replaced rings on a couple of Onan engines and used a 600 grit hone. It took about one minute for the rings to seat.

The other factor is the type of cast iron that Onan used for their cylinders. A cheap cast will wear quickly. Onan was apparently very specific what cast iron was used. As a result, if you keep the oil changed, the engine will last a very long time as evidenced here.
Newbie question, how do you know when the rings are set?

Everett



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post #192 of 194 Old 06-30-2015, 03:15 PM Thread Starter
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Re: CCKA Rebuild

Nice write up Richard. I will have to read up on the modern micro-honing that is now being used. Also I new the RP comment would stir at least one comment...lol I like the stuff because everything I put it in instantly becomes quieter. My 1975 BMW R750 was the most impressive.
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post #193 of 194 Old 06-30-2015, 06:38 PM
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Re: CCKA Rebuild

Quote:
Originally Posted by evsnova74 View Post
Newbie question, how do you know when the rings are set?
Sometimes the rings never seat. That is usually due to performing a half-hearted re-ring. A half-hearted re-ring is installing .010 oversize rings on a standard piston in an .015 worn oversize bore. Another cause is using inferior rings.

Generally, when the rings seat, you will notice that oil consumption goes to near zero, there is no start-up smoke, and the engine seems a bit peppier.

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; 06-30-2015 at 07:01 PM.
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post #194 of 194 Old 06-30-2015, 07:15 PM
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Re: CCKA Rebuild

Quote:
Originally Posted by Richard-tx View Post
Sometimes the rings never seat.
Generally, when the rings seat, you will notice that oil consumption goes to near zero, there is no start-up smoke, and the engine seems a bit peppier.
I have a new engine in a Cub Cadet, and I am DYING to put synthetic in it.



The owners manual says not to add synthetic until "some" number of hours, something like 50?
They state the rings will seat better with conventional oil,,,

Anyways, I am waiting!!

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