Detroit Diesel MBE 4000 Service Manual page 98

1.6 ENGINE BRAKE
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1.6.2 Constant-Throttle Valve Installation
Install the constant-throttle valve as follows:
1. Lubricate the valve stem with a light coating of clean engine oil. From the bottom of the
cylinder head, push the valve, as marked on removal, into the valve bore. See Figure 1-34.
NOTE:
Insert a spacer beneath the valve head to prevent the valve from opening while installing
the valve spring and piston.
2. Insert a suitable spacer about 6.0 mm (1/4 inch) in height. See Figure 1-35.
3. Install a new seal on the valve stem.
[a] With the fingers, press the seal onto the valve stem past the indentation that houses
the collets when the valve is installed.
[b] Insert the spring guide over the end of the valve stem and push down until the spring
guide bottoms out.
4. From the top of the cylinder head, fit the spring and spring retainer, as marked on removal,
onto the valve stem.
5. Push the spring down with the CTV spring remover and insert the collets into the spring
retainer. Push until they lock into place.
6. Install the piston and seal, as removed. Be careful not to damage the seal on installation.
See Figure 1-36.
7. From the bottom of the cylinder head, remove the spacer.
8. From the top of the cylinder head, install a new O-ring on the end cover.
9. Install the end cover.
10. Install the injector nozzle. Refer to section 2.4.2.
11. Install the cylinder head. Refer to section 1.2.1.
12. Repeat this procedure for each constant-throttle valve.
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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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