TM5-6115-593-34
NAVFAC P-8-631-34
TO-35C2-3-463-2
(26) Finish grind with light touches of stone
against face.
(27) Check valve seat concentricity with valve
seat indicator.
(a) Use valve guide as center.
(b) Total run out should not exceed 0.002
inch (0.05 mm).
(c) The gauge must be a perfect fit on pilot
mandrel.
(28) Check seat with mating valve to ensure
proper sealing.
(29) Test valve spring on spring tester that is
capable of accurate measurements of
spring lengths by means of standards listed
below.
Valve spring part no. ............................ 211999
Approx. free length ........................... 2.685 in.
(68.2 cm)
Assemble height ............................... 1.724 in.
(42.8 cm)
Pounds (kilograms) required
to compress
New min. ....................................... 147.25
(66.3)
New max. ...................................... 162.75
(73.2)
Worn limit ....................................... 142.0
(63.9)
(30) Spacers may be used under valve spring
when insert and valve have been refaced
to make valve spring check within load
limit.
NOTE
A maximum of 1/16 inch (1.59 mm)
spacers may be used under valve spring
when head has been resurfaced and
valve and seat have been refaced.
(31) If valve springs compress to dimension
shown, at less than load indicated under
worn limits above, valve springs should be
discarded and replaced.
(32) Remove worn sleeves with a muffler
sleeve cutting tool using extreme caution
to prevent damage to head surfaces.
(33) Remove all foreign material from injector
sleeve sealing area. Clean O-ring groove
to remove all foreign material.
(34) Clean thoroughly and dry with compressed
air.
CAUTION
Avoid
use
of
cleaning
compounds
containing ammonia which may react
with the brass sleeves.
NOTE
Machine head in sleeve seat area of head
if mutilated.
(35) Install seat cutter holder and position with
pilot in a drill press. Set drill press speed
at not more than 75 rpm. Cutter may be
turned by hand using a tap wrench.
(36) Place cylinder head on drill press table,
allowing clearance for end of heat cutter to
protrude below head surface into a pilot. A
pilot can be made by recessing a 1/2-inch
(12.7 mm) drill bushing in a plate which is
centered below drill spindle and secured in
place.
(37) Before starting drill press motor, insert
cutter, adapter, and pilot into injector bore
to ensure proper alignment.
(38) Lift cutter, adapter, and pilot, lubricate
cutter with cutting oil and start cutting
operation; apply a steady, moderate
pressure.
CAUTION
Do not cut more than 0.010 inch (0.25
mm) deep.
13-85
