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Massey Harris & Massey Ferguson Tractors Discussion Forum
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Z-134 Oil Pressure

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George H

10-26-2003 07:54:01




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My MF 202 shows about 23 lbs. oil pressure, engine hot at idle, no increase at higher rpm. Is this acceptable re:bearing wear?

Thanks




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George H

10-28-2003 08:34:55




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 Re: Z-134 Oil Pressure in reply to George H, 10-26-2003 07:54:01  
TO,

I've ordered a TI Manual, in the meantime, where is the oil pressure relief valve? Part of oil pump? If so, can you drop the pan with the engine in frame?

Thanks



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TO35

10-29-2003 15:16:53




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 Re: Re: Z-134 Oil Pressure in reply to George H, 10-28-2003 08:34:55  
George...yes its located in the oil pump body....and yes you can remove the pan inframe, its a little tough but not to bad....if you need further assistance post back....


have a nice day and best wishes...
TO



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George

10-29-2003 19:04:02




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 Re: Re: Re: Z-134 Oil Pressure in reply to TO35, 10-29-2003 15:16:53  
I've rebuilt carb, replaced points and plugs, set timing, adjusted valves(some were .046! And the damned old thing runs like a watch! Can't believe it; you would've had to hear it before. Still, old pressure is 20 psi at idle, on throttling up it rises three of four points, then falls back to 20. It may not be worth doing, but I suspect that the oil pressure relief valve sticking is that right answer...don't know it its worth removing the pan, since the 20 psi is OK, by the specs. What do you think?

I'll have to say, I'm pretty impressed with this 202; the power steering is great, motor runs great, now if I can get the remaining small problems(rebuilt radiator, new lift pump, bad three point) I think I'll have a real tractor..

Thanks

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TO35

10-30-2003 02:24:46




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 Re: Re: Re: Re: Z-134 Oil Pressure in reply to George, 10-29-2003 19:04:02  
George....since your pressure is in spec.s I would not worry to much about it, but if you do need to get in the bottom end the pressure relief valve is an easy fix(some people just like to see more psi on the gauge)....the z134's are a great engine you will enjoy it and you will be surprized what you can do with it...fix the little things you mentioned then later on you can boost up the pressure if you need to...


best wishes....
TO

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TO35

10-27-2003 02:27:37




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 Re: Z-134 Oil Pressure in reply to George H, 10-26-2003 07:54:01  
George....
The rated oil pressure on a z134 is no lower than 15psi at idle and 20 to 30psi at 2200 rpm...sounds to me like the oil pump relief valve is sticky or stuck it can be cleaned and adjusted by inserting spacer washers under the relief spring or by check the wear limits of the plunger bore(wear measurements are (0.003 to 0.005 in the bore) the relief spring should have a length of 2 inches(or add spacer washers till it is) and spring pressure should be 7 3/4 to 8 1/4 pounds at a working length of 1 3/8 inches...
you can find this inf. in the IT manual

hope this helps...
best wishes
TO

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George H

10-28-2003 06:09:49




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 Re: Re: Z-134 Oil Pressure in reply to TO35, 10-27-2003 02:27:37  
Thanks for the reply, TO...and the others. Since the oil pressure doesn't vary with rpm, at least not noticeably, the pressure relief valve may be the issue.

Thanks again.....



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CityBoy

10-26-2003 08:34:26




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 Re: Z-134 Oil Pressure in reply to George H, 10-26-2003 07:54:01  
Not an answer George, just a comment.

My MF35 Z134 slow idles hot at about 10lbs and goes up to about 27-30lbs at moderate RPMs. I'm running 10-40W Rotella. This tractor has been in the family for over 15 years running like this with no appreciable increase in oil comsumption or loss of power.

I do wonder though why the low pressure at idle.



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George

10-26-2003 19:49:40




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 Re: Re: Z-134 Oil Pressure in reply to CityBoy, 10-26-2003 08:34:26  
Cityboy,

Thanks for the reply. Just the kind of information I needed. AS I just got the tractor, haven't changed the oil, and it looks pretty weak. Plan to go to straight 30 weight, being as the pressure is low. The only other vehicle I have with a oil guage, a '66 GTO, drops pressure at idle speed, losing about 20 lbs. I think it's fairly normal for such a drop to occur. Who know's, maybe I'll get 15 years out of the old girl! :)...

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201

10-26-2003 22:03:42




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 Re: Re: Re: Z-134 Oil Pressure in reply to George, 10-26-2003 19:49:40  
I know for car engines that you need 10 psi per 1000 rpms is the rule. I cannot see tractor engines being any differant.



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George H

10-26-2003 08:17:17




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 Re: Z-134 Oil Pressure in reply to George H, 10-26-2003 07:54:01  
Sorry, the engine is Continental Z-134...same as in the MF 35...

Thanks



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