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  #1  
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the yukon sizzler the yukon sizzler is offline
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Default foo foo foo foo

Had this annoying noise coming from the '80 XLS lately,kind of a rubbing chuffing sound that rises and falls with engine revs. Pulled the genny as it seemed to be coming from that area but all looked good there, noise seems to be more apparent at tickover, (running stock mufflers so nothing to drown out the noise). If I put my finger over the end of the breather hose (which is just routed open ended over the genny to atmosphere) it stops so I guess it must be breather valve valve related ? tried a squirt of wd40 down the hose but it still remains. Do I need to pull the cam cover ?
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It is the breather valve. Getting dirty. WD40 cleaned it up for me. I sprayed directly into the 10:00 o'clock port where the hose connects.
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It's good that you are listening to your beast of burden.
It will talk to you and tell you when it needs attention.

But some noise from the breather is not enough reason to go exploring.

However, if air is being sucked back into the breather hose there may be a problem with the check valve. There may be an umbrella valve inside the cam cover, but they are not easy to service. If you are having trouble with oil leaks then it may be time to tear into it. There may be a clapper valve inside the cover that is not really repairable, unless it has a piece of a cam shim stuck in it.

Be warned though once you open one up it can be hard to stop upgrading/repairing. If you are not having trouble with oil leaks, I would not take it apart. I would wait for a second reason in addition to the breather noise to go after it.

Also as I said the internal valves are not easy to service so any work may turn out to take some time to get it done. Don't open it up until you are down for the winter so you have time to be patient and repair it proper.
Also be sure to release all the tension on the push rods before attempting to remove the cam cover if you go there.
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