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Oliver, Cletrac, Co-op & Cockshutt Tractors Discussion Forum

1850 diesel

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mgm

03-27-2006 07:17:40

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Hi: My value cover gasket is leaking which I am planing on replacing. I have saddle tanks therefore I have the 3 fuel tanks. Could someone place explain to me what I need to do I plan on installing the rubber gasket becauseit holds up to the heat better thx

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B A Star

03-27-2006 21:03:10

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Re: 1850 diesel in reply to mgm, 03-27-2006 07:17:40

Guys, Listen to what J Schwiebert said concerning the 1850 diesel valve cover gasket. When you get the valve cover off, look at the design of the cylinder head. The valve spring floor is level with the surface that the gasket sits on. That means that lubricating oil is up against the gasket at all times. Now look at the distance between the inside of the exhaust port and the valve cover gasket surface. When you increase the fuel delivery rate to increase HP the exhaust gets so hot that the valve cover gasket surface is red hot and the gasket can't survive. J. tells you that if the power level is retained at the factory setting the latest gasket will survive. Power level at 100+ and used under max load, It's a gauranteed valve cover gasket failure. The engine used in the White 2-105 had the gasket surface raised and a coolant passage was added around the exhaust port to cool that area, problem solved.
Another part of the problem is, if the gasket has been allowed to leak too long, it will deteriorate the intake manifold gaskets, causing them to be "sucked in". Now you have a passage for unfiltered air to enter the engine, a condition that we call "dusting". If it was my tractor, I would have to install new intake and exhaust manifold gaskets.
Someone commented about a cracked exhaust manifold. Remember that the exhaust manifold will "grow" in length when hot and shrink when it cools. This means that the surfaces must be clean and smooth and the retaining hardware must not be too tight. Intake manifold torque is 31 -36 Ft Lb. Exhaust manifold torque is 21 -24 Ft Lb. The exhaust manifold, when in cooldown streches if overtightened. If it can't move, it pulls apart and cracks. That's why many of the big high horsepower engines use multi piece exhaust manifolds.

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Myron KY

03-29-2006 17:42:41

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Thank you Mr. Starr!!!! in reply to B A Star, 03-27-2006 21:03:10

That is the most detailed description of the reason for gasket failure, on the 354, that I've seen. Also the first time I've heard of the resulting intake gasket failure.
Great info. Thanks for sharing!!
Myron KY

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J. Schwiebert

03-27-2006 18:54:53

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Re: 1850 diesel in reply to mgm, 03-27-2006 07:17:40

I have not figgured out what the 3 fuel tanks have to do with this: The main tank is hinged and you need to have it close to empty so when you swing it up it is out of the way fuel does not run out. Also makes it much easier to handle. The tank does not need to come off! Do you have the cast or the steel cover? I would guess you mean the Viton type gasket. Also do you pull your 1850 for all it is worth? If not set the fuel back a little bit. There were different settings for the injection pump. More fuel more power+ more heat= better change of valve cover leaking. Probably at 90 H. P. it will run a long time with out leaking.

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Sam M

03-27-2006 11:07:46

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Re: 1850 diesel in reply to mgm, 03-27-2006 07:17:40

Please don't let me discourage you but I had the same problem on my Oliver 1850 with the Perkins diesel . I replaced the value cover gasket and that helped the problem some but did not totally stop the leak . My 1850 leaks at the back right corner of the valve cover viewed from the driver's seat . There have been several posts on this web site over the years about leaking valve covers on the 1850 Oliver with the Perkins diesel . It appears this was/is a common problem due to the Perkins being a dry sleeve engine and building up a lot of heat on the engine block . I have just learned to tolerate the leak .

I cannot remember if I had to remove the hood and fuel tank to get the valve cover off or to get enough clearance to get the cover off and a new gasket on . Once you get enough clearance to get the valve cover off , it is just a matter of loosening bolts , removing the valve cover and then the old gasket . Be careful on purchasing the new gasket . Apparently there were at least two types of valve covers ( stamped steel and one other type at least ) used on the Perkins diesel and each one used a different type gasket . Once you put the new gasket on , you just tighten down again and that is it . I looked in the service manual and on this web site and there are apparently no torgue specs for the valve cover itself .

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klf

03-28-2006 09:03:26

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Re: 1850 diesel in reply to Sam M , 03-27-2006 11:07:46

Does that drip oil onto the exhaust manifold for you too?

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Shep Va

03-27-2006 13:28:39

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Re: 1850 diesel in reply to Sam M , 03-27-2006 11:07:46

Yeah, my new 1850 4x4 has the same valve cover leak. I am getting ready to tear it down and see what is going on in there and will likely try to fix the leak. I had heard that you could put a gasket in there with a metal backing that would hold better, any news on that. Might call Maibach and see what they have to say about it.

I also have a busted exhaust manifold on the 1850, another common problem. I sold my old manifolds off my other 1850, anyone know where I can get one that is not $400. Man those things are pricy.... I need to check around a little.

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Don-Wi

03-27-2006 21:28:48

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Re: 1850 diesel in reply to Shep Va, 03-27-2006 13:28:39

Sometimes when you sell some of those things, you look back and go "SON OF A .....!!!!!" when you go and buy something else that needs that exact part.... I guess that's just the way it goes though, eh Shep?
Donovan from Wisconsin

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Shep Va

03-28-2006 04:59:09

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Yeah.... in reply to Don-Wi, 03-27-2006 21:28:48

I think I sold that exhaust manifold for $200 about 2 years ago and now I am pricing them at $400+. Really didnt see that coming.....

Oh well that is the way it goes sometimes. You just make the best decisions you can at the time and move on..

I really do like that 1850 4x4 tractor though, it was worth buying another manifold for....

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