Detroit Diesel 4000 Series, Service Manual, Page: 622 / 2706

SERIES 4000 12/16V SERVICE MANUAL
[b] Reuse cylinder heads if bores are within specifications.
19. To remove bridge pin with engine installed, remove all overhead components prior
as necessary.
NOTE:
Identify any valve bridges that have turned, indicate turn or show unusual wear. Replace
all bridges that meet these criteria.
20. Install slide-hammer puller to bridge pin. Remove pin.
NOTE:
Count the number of pulls required to remove pin. If pin was removed with few pulls or
removed with little resistance, see step 20.
Measure bridge pin bore using pin bore digital measuring tool. Measure bore at three
locations; bottom, middle and top. Record values to a data sheet.
21. Preset tool to 12.7 mm (0.50 in.) prior to measuring.
[a] Replace cylinder heads if any bore is out of tolerance (13.984 – 14.00 mm (0.550
– 0.551 in.))
[b] Reuse cylinder heads if bores are within specifications.
22. Place cylinder head on hydraulic press. See Figure 357.
1. Removal Brass Drift 2. Valve Guide
Figure 357 Removing Valve Guides
All information subject to change without notice.
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