News:

           Enjoy your FJ


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