Valve Depth Measurement.
The valve springs are under compression. Use care when using
the valve spring compressor. Personnel injury can result if the
Use valve spring compressor (1, FIG. 4-3). Install spring guide (3), spring (5), spring retainer
(4), and valve collets (2).
Vacuum Test cylinder head.
(a) Install vacuum tester to valve seating area (FIG. 4-22).
(b) Apply vacuum. Measure time required for vacuum to decrease from 18 in-Hg (457 mm-Hg) to 8 in-
Hg (203 mm-Hg).
(c) If elapsed time is less than 10 seconds, perform the followin :
Repeat the test to verify equipment operation.
Hit valve stem lightly with a mallet to be sure valve is sealed.
(d) If elapsed time is still less than 10 seconds, apply a thin coating of grease to the outside diameter
of the insert and valve head. The grease will show the point of leakage. Repeat test.