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TO-30 Oil Pressure Adjustment and...

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Ted (SE Ohio)

03-11-2002 11:32:02




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1) According to other posts there is a method of adjusting the oil pressure on the Conti Z129 series engine? Can this be done by removing the oil pan? How does this work?
2) If I need to renew the crank bearings, can this be done thru the oil pan, like a Chevy?

Thanks for any and all input. Note: The tractor runs great, smokes when cold, and only shows about 10 to 15 psi under all conditions. This makes me think the pressure is too low.

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Wes

03-13-2002 22:13:17




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 Re: TO-30 Oil Pressure Adjustment and... in reply to Ted (SE Ohio), 03-11-2002 11:32:02  
After reading the posts below I'm still confused as to why I don't seem to have any oil coming up to the rocker arms on my Z129. I left the valve cover off, put fuel tank back on and ran it for 15 minutes on Sat. to get it warmed up good and could find no trace of oil at all. Took R. assembly off before this and blew air down the journal--seemed like it wasn't flowing nor do I know if it should take air. Sure hate to run it this way as I replaced a worn out set with this good used set from Mark. Further comments?

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Mark Hendershot

03-15-2002 19:04:34




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 Re: Re: TO-30 Oil Pressure Adjustment and... in reply to Wes, 03-13-2002 22:13:17  
Wes; According to the book the oil is supplied thru a passage from the rear camshaft bearing and is metered thru a passage to the rear rocker arm shaft support. The oil is carried thru the rocker arm shaft and pervides lubercation for the individual rocker arm bushings and for the valves. Then it drips down the push rods to lube the cam lobes and tapets. You better check that you have oil flow to the rear rocker support because you can damage som parts if not. Pull the plugs from the head take the rockers loose and crank the engine fast to see if you have oil coming up that port. Make sure you can blow air thru the rocker shaft too. Also check to see if something is gumming up the hole in it. Those were good rockers and came off a running engine. Not sure if you might have a pluged passage from the rear cam shaft bearing to the rear support. Email as to whats happening. Thanks, Mark

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Steve in NC

03-14-2002 18:27:47




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 Re: Re: TO-30 Oil Pressure Adjustment and... in reply to Wes, 03-13-2002 22:13:17  
Wes,
It may be the ports along the rocker shaft are plugged by the bearing material in the rocker arms. That was the case with my '52 TO30 (currently in the put-it-back-together-stage of a complete engine overhaul). You don't have to completely disassemble the rocker arm. Soak it in gas or carb cleaner if its gunked up. Then pull each cap end off and remove the end rocker arms. Check for scoring to give you some idea the overall shape of the others and check the holes. You can slide the other rocker arms aside enough to see if the holes are plugged. If so, punch them into the journal and blow them out. I think even if not jammed up with bearing metal, the oil passages to the tappet ends may be clogged.

Technically, if the bearings have lost that much material the whole assembly should probably be taken apart and new bearing pressed in. But since the end rockers were "cleanly scored" (how's that for a rationalization?) and the other rocker arms move very freely, and I don't have the time or equipment to press new ones in, I blew it clean,primed it with oil, and saw it seeping along the length of the rocker arm. I didn't realize that it was designed to deliver oil that pervasively. So I think your instincts are good. Hope this helps.

Steve

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Wes

03-16-2002 11:53:44




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 Re: Re: Re: TO-30 Oil Pressure Adjustment and... in reply to Steve in NC, 03-14-2002 18:27:47  
Thanks for your comments boys. I blew air, or tried to, through the journal opening that supplies the oil and it feels like it's plugged. Got no oil when I cranked it fast (with the plugs out) so problem lies down below. Yes Mark, the rocker arms are good and tight. Thanks again for the contact. When it warms up I will drop the pan and do some tracking. Got sick on Friday and about all I can do is peck at keyboard, and it's snowing again...

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Dennis in Ma

03-11-2002 17:35:22




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 Re: TO-30 Oil Pressure Adjustment and... in reply to Ted (SE Ohio), 03-11-2002 11:32:02  
I can't remember what adjusts the oil pressure. I don't think you can adjust it. As I remember, the pump is a gear type pump and there is no adjustment, but it's been awhile since I had mine apart. THe bearings are standard inserts that can probably be taken out without removing the crank. I seem to remember a tool for Chevies that would assist in removing/installing them. The bearings have the little tang on the back that rewuires you to remove/install them in the right direction.

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Dennis in Ma

03-11-2002 17:38:28




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 Re: Re: TO-30 Oil Pressure Adjustment and... in reply to Dennis in Ma, 03-11-2002 17:35:22  
BTW if you show 10-15 lbs, I wouldn't mess with the pump or bearings (unless it's rapping). That pressure is fine, not perfect but plenty satisfactory. You got nothing to worry about as the COntinental engines never need a lot of pressure. If it has ANY pressure it's ok, many many people in the know have told me that.

Right guys !!??



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Ray,IN

03-11-2002 19:08:22




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 Re: Re: Re: TO-30 Oil Pressure Adjustment and... in reply to Dennis in Ma, 03-11-2002 17:38:28  
Yep! The original gauge is not accurate, if any pressure is registering and the rocker arms are not clattering you have adequate oil pressure. The oil pressure relief valve is set at 30psi. If your engine has worn cam bearings, replacing the oil pump or relief valve will not increase oil pressure. Read the post by Mark Hendershot back a few days for a good explanation of too much oil pressure.



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Ted (SE Ohio)

03-11-2002 19:02:06




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 Re: Re: Re: TO-30 Oil Pressure Adjustment and... in reply to Dennis in Ma, 03-11-2002 17:38:28  
Dennis, Thanks for the info. The motor does not knock. It's actually quiet for being 50 years old. Most of the fasteners on this tractor are so clean, I don't think it has ever been apart. It will blow some oil smoke when I load it down with the wood chipper or going uphill with the brush hog working. That alone is not worth getting worried about.



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Ray,IN

03-12-2002 18:56:10




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 Re: Re: Re: Re: TO-30 Oil Pressure Adjustment and... in reply to Ted (SE Ohio), 03-11-2002 19:02:06  
You did'nt say what grade motor oil you are using, but by only using straight 30w30 non-detergent oil in summer, and 20w20 in winter, you'll be complying with the owners manual specs. With a motor 50+ years old and still running as you say, why use multi-weight detergent oils now? Remember the phrase: "If it ain't broke don't fix it".



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