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Minneapolis Moline Tractors Discussion Forum
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Solid rod found in oil supply line

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Jeff

10-07-2003 14:39:22




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Anybody have any idea on this one. My brother is rebuilding a jetstar 3 engine. When he tore it down, the oil supply line that comes from the sump area up into the valve train (head) had a solid 1 inch rod sticking out of it, 1/2 in the tube, 1/2 in the sump. With it in the position we found it, solvent under pressure in the wash tank would not pass around it. How it got there or what its purpose might be are a mystery. It's a snug fit and it's not able to float the length of the tube.

Common sense tells us that there shouldn't be anything solid stuck into this line. There is nothing shown in the overhaul manual either. We've left it out on the rebuild. Anybody have any ideas what this could be for(it reminds me of a dowel pin) or where this goes? (I'm voting for the trash can).

Thanks.

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matt hayes

10-09-2003 14:55:28




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 Re: Solid rod found in oil supply line in reply to Jeff, 10-07-2003 14:39:22  
These guys are correct about this rods function. I should be tapered on one end, which should point upwards when installed inside the tube if I remember correctly.



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Phil

10-09-2003 21:29:13




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 Re: Re: Solid rod found in oil supply line in reply to matt hayes, 10-09-2003 14:55:28  
Wouldnt the taper be better pointing down? That would let the oil move past it as it travels up toward the rocker shaft.

Anyone know the answer to confirm??

Thanks,

Phil



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Phil S.

10-09-2003 14:52:02




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 Re: Solid rod found in oil supply line in reply to Jeff, 10-07-2003 14:39:22  
It is my engine Jeff is talking about. The rod is about 4" to 5" inches in length. 1/8"? in diameter. It was sitting inside the oil tube from the block to the rocker shaft. When I unscrewed the supply tube from the Crankcase, this solid rod was protruding 1/2" from the bottom of the supply tube. WE could not figure out why it was there or if it was needed.

It seems that you guys answered the question that it needs to be in there. It is kind of rusty, so I will attempt to clean it up and get it to free float in the supply tube. Failing that, I will find a piece of round stock the same size and make a replacement.

Man, those moline engineer's... Round dowel rods to restrict oil.. Small nails to drip oil.. The 206 engine design sure evolved... Seems like some quick on the shop prototype floor shade tree mechanicin' to fix a problem..

Thanks all for the help.

PS.. I left a post on the MM website that Tony Hosts.. question about the Governor on the same engine.. check it out and reply if you guys can.

Thanks again,

Phil

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JK

10-08-2003 04:13:14




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 Re: Solid rod found in oil supply line in reply to Jeff, 10-07-2003 14:39:22  
Checked the parts books for JetStar3, JetStar3 Super and 4 Star. Part number 10A18932, the rod mentioned, is shown only in the JetStar3 book.

John



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JK

10-07-2003 19:25:19




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 Re: Solid rod found in oil supply line in reply to Jeff, 10-07-2003 14:39:22  
Jeff,
The engines had them in originally to prvent too much oil from getting to the rocker arms etc. They shouldn't block off the oil supply completely though, only limit it.
John



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Kelvin

10-07-2003 19:15:04




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 Re: Solid rod found in oil supply line in reply to Jeff, 10-07-2003 14:39:22  
The only later model I've had apart is a U302 (220cu in.) but it had that rod in it. The rod in mine was free to slide up and down in that pipe. I think yours will too when everything is cleaned up. In my opinion, that rod is there to limit the amound of oil going to the rocker arm. None of my service manuals show it, either. Haven't checked the parts book.
I've never read anything about it on molines, but some other make engines had problems smoking when they had too much oil flow up to the rocker arm. (It runs down around the valves, is sucked past the intake valve stems and then is burned.)

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erik

10-12-2003 08:17:45




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 Re: Re: Solid rod found in oil supply line in reply to Kelvin, 10-07-2003 19:15:04  
Does a 335 or a 445 have this in the tube? If so can you make this or is it still availabe through AGCO. Thank you



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Phil

10-13-2003 17:02:12




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 Re: Re: Re: Solid rod found in oil supply line in reply to erik, 10-12-2003 08:17:45  
I do not know if they have one or not, BUT, you surely can make one from a piece of steel rod. Mine was about 4 or 5 inches in length. looked like 1/8" or so.. I ended up grinding mine to get all of the corrosion off of it and it fit down through the tube fine after that. I should be good to go.

Phil



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