those are part of the recirculation system.

the ones you are talking about on the crankcase are valves. the ones by the cylinder are free flowing. the is a tool to clean them out.


the screw in fittings have little screens that can get clogged with debree.

.

the book says

- to take a syringe with a clear hose, fill with isopropyl alcohol, connect to fitting.

fluid should not pass through the fitting. if it does replace.

-draw out the syringe, and air should pass through the fitting. if not replace.

-

the check valves also have to be checked

really need to get a manual.

the problem i found with the manuals is that the earlier versions dont get into the recirculation as well as the later.


a 1994 "ER" gives a good description on how to do it.

a 1991 "EI" and below only gives you what i just did.

now the 1988 "CC" manual doesnt even give you a recirculator hose diagram.

if it was me i would go to ebay & try get the the year you need and look for the "ER" manual as well for future reference.

just trying to help