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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.
 

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Discussion Starter #183
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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Discussion Starter #185
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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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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Discussion Starter #188
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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Discussion Starter #189
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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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.
 

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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?
 

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Discussion Starter #192
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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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.
 

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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. :hide:



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!! :fing32:
 
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