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1951 TO-20 Rocker Arm Assembly Oil Pressure

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Steve Marback

04-16-2003 19:12:40




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I had rebuilt my engine a few years ago, and have had no problems until recently the the valve adjustment had gone out and the engine started missfiring. After inspecting the valve train I noticed there had never been any oil making it's way to the top of the engine. I had had good oil pressure indicating on the gauge but the head pressure passage is plugged. I have removed the rear main bearing and made sure the bearing lined up with the passage but I am still unable to clear the obstruction. There was about 1/4" of metal shavings from the rocker assembly running wiyh no oil for many hours. I am also looking for another rocker arm assembly. One of the spring retainers had worn and fell off one of the exhaust springs. Any ideas on how to clear this very plugged passage??

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Larry in Missouri

04-17-2003 09:52:57




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 Re: 1951 TO-20 Rocker Arm Assembly Oil Pressure in reply to Steve Marback, 04-16-2003 19:12:40  
Hi,

Call Jerry at Union Auto Supply in Union, Missouri. The number is (636)583-8140. Make sure you have some time - Jerry like to talk! But he knows tractors, especially Fergusons, inside out. He rebuilt my rocker assembly with a new shaft that he gets for about $80. He also pinned and rebuilt my head - did a great job. He can tell you how to get a new rocker shaft.

Good luck!

Larry in Missouri

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James, UK

04-17-2003 01:11:05




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 Re: 1951 TO-20 Rocker Arm Assembly Oil Pressure in reply to Steve Marback, 04-16-2003 19:12:40  
Steve,

If you have the Standard engine, it is possible to fit the head gasket upside down and back to front so that the oil feed from the block to the head is blocked by the incorrectly fitted head gasket.

I am told that this is not possible on the Continental engine as the cyl head studs are not symmetrical about the axes of the head.

There was a thread about this a while back - a Continental owner suggested poking a bit of stiff wire down the oilway in the block to unblock it, and also of course checking the oilways in the rocker arm and head.

So, if you have the Standard engine, remove the head to check the c/head gasket is on correctly, and if you have the Continental engine, remove the rocker assy and poke wire down the oilways in the block to try to unblock it.

Personally, if it has run that long without oil, I'd take the head off anyway, and get the valve guides checked, too, as they may be pretty worn by now after running for so long with no oil. This will also give you better access to the blocked oilway.

You will also need to remove all those metal shavings from the cam area, as they will have fallen down past the push rods. Leaving them there will ensure you have an effective grinding paste to wear the rest of the engine!!!!!

Good luck, it looks like this could keep you busy for a while. If you can confirm which engine type you have, someone out there may be able to help out with a rocker arm assy and collets.

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Steve Marback

04-17-2003 07:44:59




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 Re: Re: 1951 TO-20 Rocker Arm Assembly Oil Pressure in reply to James, UK, 04-17-2003 01:11:05  
Thanks for the info. I do have a Continental engine Z-120 and yes I will have to remove the head even though I didn't really want to, oh well this is why we keep these old tractors alive, for the fun right... That and I use the thing almost every day. I hope I am able to find a replacement Rocker arm assembly (The tube is the hard part to find), I have found most of the other parts I need.



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James, UK

04-17-2003 08:03:10




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 Re: Re: Re: 1951 TO-20 Rocker Arm Assembly Oil Pressure in reply to Steve Marback, 04-17-2003 07:44:59  
Had a problem posting to here, so this is really a check, but Steve, check your email for info on finding rocker shaft for Continental engines



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