NOTE
If valve guide oil seals are used,
compress
the
valve
spring
only
enough to permit installation of the
valve locks. Compressing the
springs too far may result in dam-
age to the oil seal.
8. Release the tool and install the valve
locks on the remaining exhaust valves in
the same manner.
9. Check the position of the exhaust
valves (see Figure 11B-61 on page
11B-39). Support the cylinder head at
each end with wood blocks and remove
the masking tape so that the exhaust
v a l v e a r e f r e e . Then give the end of the
valve stem a sharp tap with a plastic
hammer to seat the valve locks. This
F i g u r e 11B-66. Checking Pressure
will aid in the proper seating of the
Required to Open Exhaust Valve
valve locks and reduces the chances of
failure.
NOTE
10. With exhaust valves installed in the
Loosening or tightening the lock
cylinder head, us spring checking gauge
nut with the bridge in place may
J 25076-01 and note the gauge reading
result in a bent bridge guide or
the moment the exhaust valve starts to
bent rear valve stem.
open (see Figure 11B-66). The minimum
allowable pressure required to start to
open the exhaust valve must not be less
2. Install the valve bridge on the valve
then 20 pounds (89 N).
bridge guide.
11. I n s t a l l t h e i n j e c t o r s , r o c k e r a r m s ,
3. While firmly pressing straight down on
shafts, brackets and any other parts
the pallet surface of the valve bridge,
previously removed from the cylinder
turn the adjusting screw clockwise until
head.
Then
it just touches the valve stem.
turn the screw an additional 1/8 to 1/4
12. Install
the
cylinder.
Refer
to
turn clockwise and tighten the lock nut
Pre-Installation Inspection and Install
finger tight (see Figure 11B-67 on page
Cylinder Head. Adjust the exhaust
11B-43.
v a l v e b r i d g e s a s o u t l i n e d below.
4. Remove the valve bridge and place it
in a vise. Use a screwdriver to hold the
Exhaust Valve Bridge Adjustment
adjustment screw from turning and tight-
en the lock nut to 20-25 lb-ft (27-34 Nm)
The exhaust valve bridge assembly is ad-
justed
and
the
adjustment
screw
is
locked securely after the cylinder head
5. Lubricate the valve bridge guide and
is installed on the engine. Until wear
the valve bridge with engine oil.
occurs, or the cylinder head is recondi-
tioned, no further adjustment is required
6. Reinstall the valve bridge in its ori-
on the valve bridge. A complete valve
ginal position.
bridge adjustment is performed as
follows:
7. Place a 0.0015" feeler gauge (J 23185)
under each end of the valve bridge or
1. Place the valve bridge in a vise or
use a narrow strip cut from 0.0015" feel-
b r i d g e holding fixture J 21772 and loosen
er stock to fit in the bridge locating
the lock nut on the bridge adjusting
groove over the inner exhaust valve.
screw.
While pressing down on the pallet surface
