TM 5-3810-300-24&P-3
Engine Tune-Up 14
EMISSION REGULATIONS FOR ON-HIGHWAY VEHICLE ENGINES
On-highway vehicle and coach engines built by Detroit
5. Throttle delay (orifice size).
Diesel Allison are certified to be in compliance with
Federal and California Emission Regulations established
Tables I through 4 summarize all of the pertinent data
concerning the specific engine configurations required
for each model year beginning with 1970.
for each model year.
Engine certification is dependent on five physical
When serviced, all on-highway vehicle and coach
characteristics:
engines should comply with the specifications for the
1. Fuel injector type.
specific model year in which the engine was built.
2. Maximum full-load engine speed.
Trucks in a fleet containing engines of various model
years can be tuned to the latest model year, provided the
3. Camshaft timing.
engines
have
been
updated
to
meet
the
specifications for that particular year.
4. Fuel injector timing.
TABLE 1 (1970 AND 1971)
TABLE 2 (1972)
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