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Oil Field Engines & Related Equipment

Ajax 7 1/2 X 10, home from Kansas


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  #11  
Old 02-19-2006, 10:03:07 PM
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KeithW KeithW is offline
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Default Re: Ajax 7 1/2 X 10, home from Kansas

Inside the crank case is painted white but the crank is a red. Looks just like the rusty metal red primer. The racing folks use stuff called Glypthol(spelling?) to paint the insides, but it is shiney. The idea being that it is smooth and the oil runs off rather than sticking to the porous cast iron.

So far the piston and cylinder looks like the real challange. The rest seems to be just fiddly bits, big bits for sure, but pretty straight forward.

keithw
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Old 02-19-2006, 10:39:03 PM
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Doug Waggonner Doug Waggonner is offline
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Thumbs up Re: Ajax 7 1/2 X 10, home from Kansas

Keith

You were asking the other day about what color was original on Ajax engines. My 6 1\2 X 8 Ajax appears to be originally black. But Ive sen several that were varous shades of green, and alot of then had the outer rim of the flywheel painted white. Which to me looks pretty cool, and it gives an illusion that the flywheel is bigger that it actually is . As for getting that piston un-stuck, all add my 2 cents of advice. If you have access to a small sand blaster and use some very light abrasive such as silica or even baking soda. Then blast off all of the rust and crud off of the cyl wall and off the top of the piston. Be careful doing this so you dont eat away at the cyl wall its self. And what had worked well for me as far as getting the piston unstuck on large engines is to loosen the rod bearing so you have just a little slack so you can rock the flywheel a little. Which will jar the piston a little and hopefully break the tension loose thats holding the piston in place. Now I dont mean jump on the flywheel and get mean with it, but just rock it back and forth. Since you can actually see the piston there under the throttle plate and you say it looks good there, there's probably not that much rust and crud holding that piston in there. And keep it soaking with oil and give it a few kind words And you'll have it whoop'd in no time! Keep up the good work!
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Old 02-19-2006, 11:15:53 PM
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Ron Haskell Ron Haskell is offline
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Default Re: Ajax 7 1/2 X 10, home from Kansas

I have a couple of 6˝ x 8 Ajax engines. The first two numbers of the serial number are the year of manufacture.
http://albums.photo.epson.com/j/View...p=69667342&f=0
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Old 02-20-2006, 02:34:51 PM
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Default Re: Ajax 7 1/2 X 10, home from Kansas

Thanks Ron and Doug for the information. That would put mine built in 1946. Sounds about right.

Good idea about rocking the flywheel to loosen the piston. Before I work on the piston too much I'm going to investigate the layshaft. I would hate to get the piston loose and then discover I've twisted off the layshaft because it was siezed up. It drives the water pump, oiler and magneto. None of them are hard to get to. I'm also thinking about the high pressure grease method. Another thought is to make a plate to put in place of the head and put a chunk of 4x4 between it and the piston. Then tighten the head nuts to press on the piston. Not sure that I would want to use the head to press on it.

keithw
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Old 02-20-2006, 06:31:20 PM
Tom Schupska Tom Schupska is offline
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Smile Re: Ajax 7 1/2 X 10, home from Kansas

be carefull pulling on the head studs . i have pulled the threads right out of the cylinder before .if you have any questions e-mail me tschupska@alltel.net or call 440-993-6618 (good luck)
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Old 02-21-2006, 10:07:40 AM
Andrew Mackey Andrew Mackey is offline
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Exclamation Re: Ajax 7 1/2 X 10, home from Kansas

If the ports are closed, fill the cylender with Kero, or fuel oil - it will seep past the piston, and will help lube the piston for first movement. I freed a Charter - Mietz by the crank rock method. Also, putting air pressure on the kero - fuel, will help make the penetration go faster.
Andrew
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Old 02-21-2006, 12:56:48 PM
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Default Re: Ajax 7 1/2 X 10, home from Kansas

Fortunatly the ports are closed. After I pulled the head and scooped out the loose rust I put it back on and filled the combustion chamber with my favorate brew, diesel fuel and ATF. I had thought about pressurizing with air. Good to hear from someone with some experience with that. My gut feeling is that I would prefer to push on the piston from the top rather than loosen the rod cap and rock the flywheel. Still thinking about it.

keithw
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Old 02-22-2006, 04:30:21 PM
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Photo Re: Ajax 7 1/2 X 10, home from Kansas

It's off the trailer. Even with a fork lift it was plenty of work.

http://members.aol.com:/keith0alan/images/ajax5.jpg

The next time it gets moved it will be in pieces. I think electrolysis is going to be my friend for a while.

So far I have not been able to find the rated HP for this engine. Any Ajax fans out there able to help? Looks like it should be around 30 but a documented number would be nice.

Thanks to everyone for the help,

keithw
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Old 02-22-2006, 11:09:48 PM
Allan Wright Allan Wright is offline
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Default Re: Ajax 7 1/2 X 10, home from Kansas

Hello Keith, an 8 1/2 x 10 will be in the 42 horsepower range. These are very strong running engines.
Keep us updated on the progress.
Good luck with it
Allan
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Old 02-23-2006, 12:50:10 PM
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Default Re: Ajax 7 1/2 X 10, home from Kansas

Thanks for the HP info. Thats pretty strong. Once I get it going I'll be looking for a generator to power with it. That will be a ways into the future. I'm goint to have to refurbish a lot of SU carbs (the hobby that pays for the other hobbies) before this one gets finished .

keithw
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