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No oil to rocker assy?

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Mark

03-16-2003 19:27:52




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On my TO-20 it appears like there is not any oil getting to the top of the engine. I just recently got it going and the oil pressure is 15 revved up and less than 5 idling (new gauge). I took off the valve cover and there really is not any oil coming out while running. Should I see much oil up there while running? What could be the cause of this?




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Wes in SC

03-18-2003 09:47:51




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 Re: No oil to rocker assy? in reply to Mark, 03-16-2003 19:27:52  
I had the same problem with my TEA20 a few years ago. As best I remember, I found that the oil passage goes into the rocker arm shaft mount at the rear of the engine. I pulled the assembly and found the passage plugged with crud right where is goes into the rocker arm shaft mount. Removed the crud with a small piece of wire and it has been fine since. This was not long after I acquired the tractor. No telling how long it had run like this. The residual oil on the shaft was like grease. There was no apparent damage so I guess it couldn't have been very long.

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Dan S (NY)

03-17-2003 09:33:51




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 Re: No oil to rocker assy? in reply to Mark, 03-16-2003 19:27:52  
When I put the head back on my TO20 (Continental Z120) the gasket would only fit correctly over the studs in one direction so I doubt its your head gasket. The oil gallery comes up through the 'leg' of the rocker assembly closest to the rear of the engine. Something must be plugged somewhere. When I ran mine with the cover off, a mist of oil sprayed everywhere.

Good luck!
Dan



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Mark

03-18-2003 04:45:03




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 Re: Re: No oil to rocker assy? in reply to Dan S (NY), 03-17-2003 09:33:51  
It sounds like I should be able to pull the rocker assembly only and check/clean the oil passage from the top of the head.



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Dan S (NY)

03-18-2003 09:08:10




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 Re: Re: Re: No oil to rocker assy? in reply to Mark, 03-18-2003 04:45:03  
Yes. If your lucky the blockage will not be to far down in the engine, or maybe its the rocker assembly thats plugged. You could try cranking the engine after removing the rocker assembly and see if you get any oil at all coming out of the oil gallery hole. I wouldn't expect a gusher at cranking speed but you should get something.

Dan



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James, UK

03-17-2003 05:40:16




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 Re: No oil to rocker assy? in reply to Mark, 03-16-2003 19:27:52  
Have you had the head off recently??

I don't know if your engine is a Standard, but if it is, you could check that you have the cylinder head gasket(s) correctly installed.

The oil feed comes up through a hole in the block and into a gallery in the head - getting the head gasket on wrongly (back is front, front is back, up is down, down is up) will (a) block the oilway so preventing oil getting to the valves/tappets/stems etc. and (b) make the engine boil easily.

I'm guessing that this is the problem as your oil pressure seems good. The rockers/tappets and valve area should always get a good supply of oil - you will kill this engine if you don't cure the problem.

Someone who owns a Continental engined version may be able to tell you if it is possible to do a similar trick with the head gaskets on that engine.

Easy fix (plus new gasket(s) of course!) but irritating none the less.

Of course, if you didn't change the head gasket, maybe the oil way is just blocked - in which case you will need to remove the head anyway.

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John

03-18-2003 13:41:55




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 Re: Re: No oil to rocker assy? in reply to James, UK, 03-17-2003 05:40:16  
I cant remember what the arrangement is for the Continental engine, but on the Standard engine we used to get the the camshaft rear bearing blocked. On this bearing it had an oilway like a scroll round the bearing surface and if the oil got neglected it could block this oilway up, the only way to clear it was to remove the camshaft and clean it. Maybe someone will know if it is tha same, sorry I cant remember...

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