TM  10-3930-643-34 GENERAL  SUPPORT  ENGINE,  FUEL,  EXHAUST  AND  COOLING  MAINTENANCE. 13-2. Cylinder Head Assembly with Valves. (Sheet 4 of 6) CLEANING/INSPECTION/ASSEMBLY 5. 6. 7. 8. 9. Lubricate outside diameter of new valve guides (1) with lubricating oil. NOTE The 30 degree chamfer at the top of the valve guide is intended to allow excess oil to drain away from the top. Inverting  the  valve guides can lead to excessive oil consumption. Using valve guide installer tool, install new valve guides (1) with threaded  portions  down. Using a dial  indicator,  measure height from top deck of cylinder head (2) to top of valve guide (l). Clearance for valve guides (1) must be between 1.207 and 1.227 inches for intake and valve guides (1) must be between 1.287 and 1.307 inches for exhaust. Inspect six seats (3) and inserts (4), refer to paragraph 4-4. Replace if valve guide (1) does not seat properly  after  being  resurfaced. Using a slide hammer and expanding screw,  with  pre-cup  puller  (exhaust), remove damaged seats (3) or inserts (4). Go to sheet 5 13-11