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Antique Steel Wheel Tractors - Old Iron Lugs and Cleats

Hart-Parr Oil King Project


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  #1  
Old 09-06-2010, 11:42:34 AM
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Default Hart-Parr Oil King Project

Since we've had this tractor it always cranked easy and just ran ok. The valve springs had lost their tension and every time the piston would go down, both valves would open. We took the head off to do a valve job and have new springs made only to find out you could grab the piston and knock it against both sides of the block about 1/4 of an inch. So....we decided to tear it down and do a rebuild two months before our show.

Here are some pics from our experience so far. Four weeks to go!



This was Dad and I trying to figure out how to get the coolant oil out without making a giant mess. I'm not sure the oil had ever been changed and there was about 12 inches of sludge blocking the valve. To take the head off, we found out it didn't matter because the head has no cooling ports at all. Just a huge chunk of cast.



Here we are pulling the piston. Thankfully, it had holes drilled and tapped already.





There was some pucker factor here when we saw the crank bent like this. No worries, its made this way. You can kind of see here what we think are the initials of the machinist who might have originally done the work.
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Old 09-06-2010, 11:45:11 AM
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Default Re: Hart-Parr Oil King Project



Here we are removing the block. Sent the block and piston to Maggert Machine to be sleeved.







Thats 10 x 14 folks.
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Old 09-06-2010, 10:44:27 PM
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Default Re: Hart-Parr Oil King Project

Just got back from the shop and figured I would post some more pics.



The clutch on this thing was way past shot. It was a 5/8 inch piece of cast iron with a lining on both sides. You can see where the rivets were worn down and a crack in one of the drive holes where it looks like someone just jammed the clutch in too hard at one point. There are two, one inch steel dowels that fit through two of the holes in this plate and drive the entire tractor.



The new next to the old.



For Craig...a picture of the governor without the cover. We're rebuilding this too. Already had new springs made.
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Old 09-06-2010, 10:50:26 PM
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Default Re: Hart-Parr Oil King Project



Here are the dowels I spoke of.



Where the cam bearings go. These were so worn you could watch the cam jump up and down as it hit the lifters.



The cam shaft and one of the old bearings there on the right.



Me turning new cam bearings down.
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Old 09-06-2010, 10:52:58 PM
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Default Re: Hart-Parr Oil King Project



Close to finished bearing fitted to the shaft. Ready to drill oil holes.
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Old 09-22-2010, 01:04:10 PM
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Default Re: Hart-Parr Oil King Project

We're a little further along and 8 days till our show...



The head with new valve springs and a proper valve job. Waiting to be painted.



The piston back from Maggert's Machine. They did a fantastic job on both the piston and block. Here it awaits a good washing with soap and water then an oil bath.



Here I am with one of my friends who works at SpaceX compressing the rings to put the piston back in. (We also switched to the good camera instead of taking pics with our phones)



You can see the sleeve here and how Maggert's locked it in drilling and tapping holes on the sleeve seam.
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Old 09-22-2010, 01:59:13 PM
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Default Re: Hart-Parr Oil King Project

Is the bend in the rod is because of the offset crank to the cenerline of the cylinder to reduce angularity during the power stroke?
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Old 09-22-2010, 02:26:54 PM
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Default Re: Hart-Parr Oil King Project



Picking everything up to be mounted back on the tractor.



It took some finagling to get everything lined back up.



Getting the rod bearing adjusted and locked down.



I just like this picture.

---------- Post added at 01:26 PM ---------- Previous post was at 01:10 PM ----------

Quote:
Originally Posted by Forrest A View Post
Is the bend in the rod is because of the offset crank to the cenerline of the cylinder to reduce angularity during the power stroke?

Yep, I believe it to be offset back then for the same reasons some cranks are offset today, longer intake and powerstroke improving torque and allowing better engine aspiration. I'm not an expert on the design, so maybe others can help fill in the gaps.

I really feel that Hart-Parr was ahead of their time with this technology. Does anyone else know of a tractor that had an offset crank in the teens and 20's?
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Old 09-22-2010, 02:45:29 PM
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Default Re: Hart-Parr Oil King Project

I thought the bend in the connecting rod might be for camshaft clearance.......
At any rate, as far as I know... ...Hart Parr, pioneered the idea of offsetting the crankshaft in order to reduce the angularity of the rod during the power stroke. A more direct push on the crank delivers more torque.
The angle increases on the compression stroke, of course, but that's not the one that counts.......
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Old 09-23-2010, 12:12:14 AM
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Default Re: Hart-Parr Oil King Project

I believe that was a Rumely heavyweight trick as well. Apparently the reduced angle on the rod during the power stroke = less wear on the piston/cylinder.
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