12 valve evac system

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Old Mar 3, 2012 | 08:17 PM
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Default 12 valve evac system

What kind of crankcase evac system does a 1st gen Cummins use?

Last edited by TheGreat4.8; Mar 3, 2012 at 09:14 PM.
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Old Mar 4, 2012 | 12:49 AM
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Friend with a P-pumped 1st gen says:

Originally Posted by BigRed Cummins
Driver's side rear of the tappet cover on the engine there is a hose that runs down to the ground. Are you getting lots of oil leaks from excessive blow-by? Unfortunately those motors are known for having blow-by issues. There is a valve cover crankcase vent available from Case tractors that helps a great deal, and some guys drill their stock valve covers and install universal breather filters.
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Old Mar 4, 2012 | 01:01 AM
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Hah you are all over this forum man, that's a pretty stone age setup for an evac system.
My next question was going to be why nobody uses the factory vacuum pump to draw fresh air through the system?

Oh and how is that ok to have an unfiltered way for sand and dust to get into the crank case when it's not running, lets say in one of those Arizona sand storms?
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Old Apr 18, 2012 | 04:14 PM
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If your worried about sandstorms and dust blowing in AZ on a older 12v then all you need to do is add a aftermarket breather tank to the end of the crankcase vent.

The reason that no one uses a evac system is they are not needed for highway usage.There is a system made that the 5.9 Cummins equipped Case tractors use but most guys just buy the valve covers for added venting on their high HP 12v trucks and not the evac system.

Back years ago this is what was the rage on the TDR board with the 12v guys who did alot of towing,maybe this will help you..

Walker Engineering - Product Detail
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