Thread: Valve Guides
View Single Post
JFairman JFairman is offline
Registered User
Join Date: Jul 2006
Location: S. Florida
Posts: 7,289
While the cam tower's off make sure all the cam spray bar holes are not clogged and are spraying. There's 3 spray bar holes per cylinder one sprays up at the the bottom of the upper valve cover so the oil bounces off and splatters everywhere and the other two spray over towards intake and exhaust rockers, valve springs, and valve guides.

You can spray carb cleaner into the end of the spray bar with the straw attachment while holding a finger over the oil hole in the cam journal under where you're spraying the carb cleaner in and watch the spray bar holes to see if solvent is spraying out all of them.
Use a pin or sewing needle and push it in the spray bar holes to break any stuff loose that might be clogging them and rinse it out the other end of the spray bar where the 17mm plug screws in.

If there's stuff in there clogging them you can remove the spray bars to really clean them good. There's threads on doing that in the technical forum. In turbo motors it's burnt oil coke from the turbo bearing housing that clogs them because unless someone installs an oil filter in the turbo scavange oil return line any oil coke carbon particals from the turbo gets pumped back to the oil tank unfiltered.
Old 04-24-2014, 07:39 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #3 (permalink)