Detroit Diesel MBE 4000 Service Manual page 190

1.19 VALVES
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[b] Move the dial gauge and gauge holder to the spring retainer on the exhaust valve.
Make sure the dial gauge still has a preload of approximately 15 mm (0.60 inch) to
provide adequate travel for checking the exhaust valve lift.
[c] Set the scale on the dial gauge to "0" (zero).
[d] Using the engine cranking tool, (J 46167 or 407 589 00 63 00) turn the flywheel in a
counterclockwise direction (as viewed from the flywheel end).
NOTE:
The dial gauge will show the highest reading when the valve is completely open.
[e] When the valve is completely open, read off the value on the dial gauge. If the
exhaust valve lift reaches at least 11.963 mm (0.4710 inch) at its highest point, the
exhaust valve is lifting OK. Check the next cylinder.If the exhaust valve lift fails to
reach 11.963 mm (0.4710 inch) at its highest point, remove the camshaft and inspect
the cams for wear. Refer to section 1.22.1.
NOTE:
If the gauge reading fails to reach 11.963 mm (0.4710 inch), be sure the valves were
completely open. The dial gauge will show the highest reading when the valve is
completely open.
7. Check the valve lift, both intake and exhaust, on the remaining cylinders, one at a time,
until all have been checked.
8. Remove the dial gauge and holder from the cylinder head.
9. Remove the engine cranking tool (J 46167 or 407 589 00 63 00) from the flywheel housing
and install the inspection cover. Tighten the inspection cover bolts 25 N·m (18 lb·ft).
10. Install the cylinder head cover. Refer to section 1.1.2.
1.19.2 Valve Lash Checking
Check and adjust the valve lash as follows:
NOTE:
Adjust the valve lash when the engine is cold. Wait at least 30 minutes after shutdown,
even if the engine ran only a short time.
Select a method for adjusting the valves. There are two acceptable methods for adjusting the
valves, prior to checking the valve lash:
In order, according to the timing sequence used for fuel injection (see Method One—Adjust
Each Cylinder in Firing Order);
By type of valve, depending on crankshaft position (see Method Two—Adjust All Valves
Using Two Crankshaft Positions).
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6SE412 0403 Copyright © 2004 DETROIT DIESEL CORPORATION
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All information subject to change without notice.
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