[Code of Federal Regulations]
[Title 40, Volume 17]
[Revised as of July 1, 2003]
From the U.S. Government Printing Office via GPO Access
[CITE: 40CFR86.884-5]

[Page 64]
 
                   TITLE 40--PROTECTION OF ENVIRONMENT
 
         CHAPTER I--ENVIRONMENTAL PROTECTION AGENCY (CONTINUED)
 
PART 86--CONTROL OF EMISSIONS FROM NEW AND IN-USE HIGHWAY VEHICLES AND 
ENGINES (CONTINUED)--Table of Contents
 
Subpart I--Emission Regulations for New Diesel Heavy-Duty Engines; Smoke 
                         Exhaust Test Procedure
 
Sec. 86.884-5  Test procedures.

    The procedures described in this and subsequent sections will be the 
test program to determine the conformity of engines with the standards 
set forth in Sec. 86.084-11(b).
    (a) The test consists of a prescribed sequence of engine operating 
conditions on an engine dynamometer with continuous examination of the 
exhaust gases. The test is applicable equally to controlled engines 
equipped with means for preventing, controlling, or eliminating smoke 
emissions and to uncontrolled engines.
    (b) The test is designed to determine the opacity of smoke in 
exhaust emissions during those engine operating conditions which tend to 
promote smoke from diesel vehicles.
    (c) The test procedure begins with a preconditioned engine which is 
then run through preloading and preconditioning operations. After an 
idling period, the engine is operated through acceleration and lugging 
modes during which smoke emission measurements are made to compare with 
the standards. The engine is then returned to the idle condition and the 
acceleration and lugging modes are repeated. Three consecutive sequences 
of acceleration and lugging constitutes the full set of operating 
conditions for smoke emission measurement.
    (d)(1) Except in cases of component mulfunction or failure, all 
emission control systems installed on, or incorporated in, a new motor 
vehicle engine shall be functioning during all procedures in this 
subpart.
    (2) Maintenance to correct component malfunction or failure shall be 
authorized in accordance with Sec. 86.084-25.

[48 FR 52203, Nov. 16, 1983, as amended at 49 FR 48140, Dec. 10, 1984; 
54 FR 14559, Apr. 11, 1989]