News:

         
Welcome to FJowners.com


It is the members who make this best place for FJ related content on the internet.

Main Menu

Initial valve shims after head rework

Started by TheRadBaron, February 06, 2011, 10:46:35 AM

Previous topic - Next topic

TheRadBaron

I just got the cams back in and timed.  I'm in the process of making measurements for valve shims.  I had the head off the motor and hand-lapped all the valves, hot-tanked the head and decarbonized all the valves and seats. 
I don't have a lot of experience in the matter, but it seems likely to me that the valve clearances will close up a bit after some miles due to the valves "taking a set" in the reworked seats.
While I'm shimming the valves, would it be a good idea to set the clearances at the loose end of the range  (.20mm ex, .16mm in.)?  I would still keep a close eye on them for the first few thousand miles.  I'd like to avoid having to buy more shims after the break-in period, but I will if I have to.  Or would it be a better idea for me to shim the valves into the middle of the range like I would normally?  Thanks.
The desire for safety stands against every great and noble enterprise.  -Tacitus

RichBaker

It is always best to set the clearances to the high end.... these valves tighten up as they wear.  "A happy valve is a Tappy valve...."   :drinks:
Rich Baker - NRA Life, AZCDL, Trail Riders of S. AZ. , AMA Life, BRC, HEAT Dirt Riders, SAMA....
Tennessee Squire
90 FJ1200, 03 WR450F ;8^P