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Do I have a spun bearing ? Long...

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Crispin

02-18-2003 14:00:41




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Bought the family's '52 SC. It was all there and in good shape but seized. Did a driveway rebuild. Left the crank in, pistons out the top. Left the jugs in. Rebuilt the head. New piston rings, honed the cylinders, reconditioned the rods including new bushings, used the existing bearings (clearances OK). Put it all back togather and it ran like a champ. Filled with just water, drove about 5 miles home with no problem. The water pump leaked so I kept filling it up so it never got too low. Sent the pump out and when it came back I put all the coolant in that I had on hand, about 2 gal. and ran the tractor thinking it was almost full. While it was running, I heard a slight knock and the speed of the engine slowed to where it almost stalled. I shut it off. Didn't seem hot so I let it cool and I started it up again. Ran fine for about 3-5 min. and began to slow again. I finally got more coolant and topped it off. It took way more than I figured! Could I have damaged something running it with about half its coolant. Could the cylinders get hot and sieze the engine? Could I have had a blocked oil passage that I didn't find in my driveway rebuild? It ran fine the 5 miles filled up with water...
I've parked it since Fall but will be anxious to get back into it soon. I had installed all new gagues and know that the temp. didn't get high. Has about 25 psi oil pressure. It has 10w40 in it now. Should I get that out? The last time I ran it was to get to its resting place for the Winter, it ran fine and didn't seem to be slowing, but I didn't want to keep running it until I knew more.
One more thing.. One rod bearing wasn't like the rest. It was a different make. Could that bearing have spun before and me running the thing on 10w40 put it over the edge? The crank wasn't perfect, nor were the bearings perfect. There was some scoring on all four throws. I just polished with crokus cloth and put it back togather. What do you all think?

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L.Lamp

02-22-2003 12:45:11




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 Re: Do I have a spun bearing ? Long... in reply to Crispin, 02-18-2003 14:00:41  
Do this first. Get some Marvel Mystery Oil and add a good dose double recommended use for top oil additive recommendation. I have a DC that had been run at least 50 hours and I started it up last winter when it was about 15 degrees. It ran at about 600 rpm for about 5 minutes and proceeded to slow down and stop. The starter wouldn't turn it and I couldn't turn it over with the crank. I waited about half an hour and I could turn it again. I decided it wasn't getting enough oil to the upper cylinder area and put in a dose of Marvel. I started it and have not experienced the problem again. I also had 10w-40 Havoline in it at the time. I had put new sleeves and pistons in it. I don't think you have run it enough to do serious damage if you shut it off right away. This post I think has saved my bacon since I have just overhauled a '49 SC and I had to shim the mains. I don't remember punching a hole for the oil to go through the shim for any of the mains. I'm going to do it TWICE.

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CASEPOWER

02-18-2003 19:15:52




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 Re: Do I have a spun bearing ? Long... in reply to Crispin, 02-18-2003 14:00:41  
I'm with Fred on this one. I have "been there done that" Your engine is sticking because the cylinder and piston is getting scorn. You may have to pull the head, hone the cylinder, and file a little on a piston to get it right. To close of a tolorance will do the same thing. Put you a temp guage on when done and keep a eye on it..



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Crispin

02-19-2003 05:52:25




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 Re: Re: Do I have a spun bearing ? Long... in reply to CASEPOWER, 02-18-2003 19:15:52  
Thanks all. I think you're right on the cylinders. It seams like the cylinders would be more capable stopping the engine than a rod. This is one of the more stupid things I've ever done. The good part is that my livelyhood doesn't depend on it....
What's the chance that I don't have to tear it down? It did run on that last little journey longer than the previous run....
If I do have to take it down again, I will be reminded of my friend's saying, "we do it right because we do it twice".

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CASEPOWER

02-19-2003 06:59:50




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 Re: Re: Re: Do I have a spun bearing ? Long... in reply to Crispin, 02-19-2003 05:52:25  
It's your choice, but I would take it down. The gaulding may cause ring trouble. I will tell you how much the pistons expand under heat. I can start my puller cold and it runs great but after get to operating temp the piston to head clearance is so close it starts tapping the pistons against the head. I have corrected that by taking .020 off the pistons. I would be afraid that the scars on the piston and sleeve in yours would get worse over time. It's one of them better safe then sorry deals..

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Crispin

02-19-2003 10:45:33




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 Re: Re: Re: Re: Do I have a spun bearing ? Long... in reply to CASEPOWER, 02-19-2003 06:59:50  
Thanks, I think you're right. It's run so little with the problem that I may have done very little damage.



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Fredct

02-18-2003 19:01:14




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 Re: Do I have a spun bearing ? Long... in reply to Crispin, 02-18-2003 14:00:41  
Crispin, according to my manual the capacity of the SC cooling system is 4 gals. If you only had two (or less) the head and a good portion of the cylinders would not of had any coolant and the water pump is located high also. My guess is that the pistons were starting to sieze in the sleeves. Try filling it the rest of the way and see what happens. If necessary, remove the head to check for scoring in the cylinders first. Good luck!! FSB

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Eddie in KY

02-18-2003 18:53:33




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 Re: Do I have a spun bearing ? Long... in reply to Crispin, 02-18-2003 14:00:41  
Dont know if this is what happened to you but, I bought a Massey 50 from a neighbor that sold it saying it had a bad engine(spun rod bearing cyl #4)and the rest of the motor was freshly overhauled by a dealer. The dealer fixed the problem once and it happened again within 15 minutes of running it. Upon close inspection, I found the rear main had been installed upside down. This stoppped flow to the rod bearings. You may want to check this out too. Again, I dont know if this is your problem but check your bearing installation. No telling what you may find.

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Gordon

02-18-2003 17:20:59




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 Re: Do I have a spun bearing ? Long... in reply to Crispin, 02-18-2003 14:00:41  
This is hard did you shim the rods? I would change the oil and filter. Put heaver oil in and I think I would pull the side covers and take a look. When the tractor was new all they used was water.Was it knocking when you started it agian?



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