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News: 10/5/12 - All new members are REQUIRED to fill out the signature section of your profile. Otherwise, you may be deleted from the forum. This is to help me determine if you are a member or if you are a spammer. Thank you.

9/22/12 - I ask that you please add a signature line to your profiles on the Cletrac Forum to help me to determine who is spam and who is not. You don't need to drop everything and do this immediately, but please do it when you get a minute and you are visiting the forum. Just go to http://cletrac.org/forum2010/index.php?action=profile and put something in the signature area. If you no longer want to be a member on the Cletrac Forum, please remove your membership.

8/10/11 - Added a new board: Trucking and Hauling

5/30/11 - Just added several new pictures to the Photo Gallery, including several Alfta Track OC-4 working in snow logging, several from the Chicago Road Show, and some from a logging show (not all Oliver/Cletrac). All these pictures are from around 1963 and were scanned from old slides given to me by my late friend John W. Davis. Go to the Photo Gallery and click on "NEW" to see these pictures. Quality is marginal, but I think you will enjoy them.

2/13/11 - Just added a new board "New members introduce yourselves here".

Folks, I just added a new photo gallery where you can upload your own pictures with descriptions, etc. Right now this is in the beta testing stage to see how it works out. Give it a try, but please keep a backup copy of your pictures just in case we decide to use something else. I would prefer you use your real name on the photo gallery, but if you really don't want to, please use the same username as on the forum. Please put your images into the proper categories and take care when your write out your descriptions and image names so people can search for them. I am learning this as we go. At least at the beginning, I have it set up where the administrator has to approve members. I am afraid we may get porn spam in here if we leave it open. To get to the photo gallery, use this link: http://cletrac.org/photos/

Folks, when you join the forum, or when you get the chance to update your Profile, please be sure to put your location and interests. Filling out your signature would help as well. I've been getting some spammers joining and posting links to sites that are completely unrelated to Cletrac or Oliver, or anything to do with tractors. It would make it easier for me, as well as all the other members, if you guys would put your location and interest in your profile. See http://cletrac.org/forum2010/index.php?topic=1299.msg5184#msg5184

Thanks,
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Author Topic: Back! (With my OC-46 again.)  (Read 80 times)
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Dianne
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« on: July 16, 2018, 03:34:04 PM »

It has been a long time since I have been here - back in about 2005 when I was rebuilding my 1952 OC-46 with the 3 cylinder Hercules engine. I rebuilt it from a pile of scrap, used it for a few years for some major work around the property, and then  it has been parked for quite a few years.

I needed it again this summer so I got some fresh gas, topped up the fluids but, when I did I had coolant coming out of the exhaust manifold  Angry Angry Angry My friend came over with his big Case tractor and helped me get the loader off and this afternoon I pulled the cylinder head. I can't SEE a hole between the coolant passage and the cylinder but the way the coolant came pouring through, there has got to be one there somewhere!

The cylinders look okay but I need to get a valve spring compressor and take the valves out to get a good look in the head. I suspect a cracked head. A good friend is an excellent welder so I have asked him  to have a look at it. I hope to gawd that I can fix this head! There is probably less than 50 hours on it since new valves, guides, seats, and springs! If it can't be fixed, I am going to be on the hunt for another head  Angry

Thankfully it cranked okay once I got the head off (after I gave it a little "encouragement" with two 12 volt batteries in parallel ROFL!)

Anyway, just thought I would drop in and share my misery LOL!
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Dianne
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« Reply #1 on: July 16, 2018, 06:21:41 PM »

Found my problem! A piece of  cast is  completely broken out on the #3 exhaust port directly into the coolant passage. Still haven't heard from my welder. I wonder if I could sleeve the exhaust port with some stainless steel and high temperate adhesive? Wonder if anybody makes an adhesive that holds up to exhaust temperatures right next to the valve?

I would hate to have to  change heads. This one has less than  50 hours on it since a complete rebuild!
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Blake Malkamaki
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« Reply #2 on: July 19, 2018, 02:16:42 AM »

It's hard to tell from your picture... how far from the seat and how far from the valve stem is the hole? Could it be plugged with a pipe plug and then machined off? They do install hardened valve seats and use some kind of adhesive to hold them in, so there is something that will hold up.

Blake
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Dianne
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« Reply #3 on: July 19, 2018, 05:09:39 PM »

... how far from the seat and how far from the valve stem is the hole?

The hole is about half way between the  valve stem and the manifold mounting face but it is 1/4" wide and 1/2" long. It also includes a radius where the more-or-less round passage transitions to rectangular  so a threaded in plug would have to be pretty large.

I was also concerned that if I had one spot that corroded, gawd knows what other flaws there might be!

A replacement head seemed like a good idea under the circumstances.
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