200 BENCH PROCEDURES
Page 5-43
[213 NB] INLET AND EXHAUST
VALVES
Inspection
Refer to Figure 5-56.
Visually inspect valves for cracks, pits or other
conditions that may cause improper operation.
Check valve seat angle. Also check stem length,
diameter and condition.
Figure 5-56 — Valve Dimensions (Through September 1996 Production)
Valve Identification
The Pyromet exhaust valve cannot be used on
E7 engines equipped with a Dynatard engine
brake. The Pyromet exhaust valve head is
0.020 inch (0.508 mm) thicker than a
conventional exhaust valve; therefore, valve-to-
piston contact may occur when engine brake is
activated.
To permit positive identification, exhaust valve
has two stem grooves and inlet valve has one
stem groove.
The valves are also identified by letters
“I” (30-degree inlet), “2” (20-degree inlet),
“E” (exhaust) or “Y” (Pyromet exhaust), which are
forged in a slight depression on bottom face of
valve head.
5-101.bk Page 43 Friday, March 17, 2006 11:05 AM
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