1850 valve cover gasket

Jake Collie · Dec 5, 2014

I have to replace the valve cover gasket on my 1969 1850 diesel with cast iron valve cover. It appears that part # 165990A is the correct gasket for the cast iron cover. Does anyone have any tips they have learned to make this an easier/longer lasting gasket replacement? From what I have read, it seems this will be a reoccurring job for me with this tractor. Thanks much!

J. Schwiebert · Dec 5, 2014

Check into it a little bit. I don't know if you are going with a gasket from Agco or some other source. Where is your gasket leaking? Let me think on that. I have changed 1 in the last 25 years. J.

Jake Collie · Dec 5, 2014

I was going to purchase it from AGCO. The gasket is leaking in the front and also on the back side (towards the driver). The guy I bought it from says he had it "turned up" when it was rebuilt which, from reading here, that will cause the gasket to leak. Should I have it turned back down to 92 horse after installing the new gasket?

Cas · Dec 5, 2014

I use Permatex #2 non hardening gasket cement. Put Permatex on the pan side. Tighten the top studs on valve cover evenly. Retighten the next day. This is what I have used for the last forty years.
As far as turning the engine down, I do not quite see how it could cause a problem. Unless,the exhaust manifold gasket is leaking a little and it hardened(burned) the valve cover gasket. Have seen a lot of 1850s turned up about ten percent with no problems. More than than that and you are just wasting fuel and diluting the crankcase.
The cast valve cover is easy to keep sealed. The later 354s with stamped steel covers can be a little problem. It seems like quite a few guys overtighten the 1/4 inch bolts that hold it down.
Have to hammer those back straight. I am going to stop; getting off the topic.

Jake Collie · Dec 5, 2014

Thanks for the reply. I thought I read somewhere that by turning up the horsepower you add heat to the engine and that is bad in this case because there is no coolant ports close to the valve cover on this engine which creates leaks on the gasket.

Kelly MT · Dec 5, 2014

Jake, I sealed my 1850 cast cover with the "Right Stuff" black silicone, no leaks. PK

J. Schwiebert · Dec 6, 2014

Send me an e-mail. I want to talk to you about hydraulic PUMP QUESTION. j.

CDN 400 · Dec 6, 2014

Take your valve cover to a machine shop or someone with good belt plane and get it trued up.Then glue your gasket to the cover with contact cement don't put any thing on the other side and install.If its true it won't leak and by glueing it to the cover you can remove the cover a 100 times for whatever reason and never wreck the gasket.

J. Schwiebert · Dec 7, 2014

So far that is the beast advice on here. Those cast covers are 45 years old and I am sure most of them are not flat anymore plus the last one I did someone had removed the end 2 clamps. J.

1850 valve cover gasket

Jake Collie

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J. Schwiebert

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Jake Collie

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Cas

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Jake Collie

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Kelly MT

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J. Schwiebert

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CDN 400

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J. Schwiebert

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