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Oliver, Cletrac, Co-op & Cockshutt Tractors Discussion Forum
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Re: 1550 Diesel Intake valve seals??

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Author  [Modern View]

01-03-2013 08:14:48

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Diesels are different from the gas engines in that the intake side is free air so dilution with more 'free air' makes not a jot of difference, as it might, to the mixture of a gas engine with (carburettor).

The diesel should be running with a minimum vacuum at the intake side (not like a gas when the carb throttle valve is closed completely), limited to the state of the air cleaner, so oil is not sucked down the guides, but it can be blown down with crankcase pressure (another possibility?).

If the valves or guides are worn so much that excessive leakage is occurring, then likely it is getting close to the time for a cylinder head overhaul at the minimum. Not as bad on these slower revving engines as on the higher revving modern auto diesels (but they can go a long time without attention these days). Loose valve guide clearance will eventually lead to worn seats/valves. Then things, as in problems, get compounded.

But some engines are more prone to this and lots are fitted with seals anyway

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01-03-2013 10:22:42

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 Re: 1550 Diesel Intake valve seals?? in reply to oliver90owner, 01-03-2013 08:14:48  
Thanks for your input oliver90. Engine was rebuilt about 800 hrs ago. I did most myself but had head into shop for redo of valves. Thats why I was a little concerned when I notice oil seeping out intake. Don't recall if I ever removed studs from head on intake side(see my last post) But I know I would never have expected that they would go through to oil chamber of head. Thanks again for your input. Rocko.

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