[Code of Federal Regulations]
[Title 40, Volume 30]
[Revised as of July 1, 2004]
From the U.S. Government Printing Office via GPO Access
[CITE: 40CFR1065.410]

[Page 665-666]
 
                   TITLE 40--PROTECTION OF ENVIRONMENT
 
         CHAPTER I--ENVIRONMENTAL PROTECTION AGENCY (CONTINUED)
 
PART 1065_TEST PROCEDURES AND EQUIPMENT--Table of Contents
 
    Subpart E_Engine Selection, Preparation, and Service Accumulation
 
Sec. 1065.410  Service limits for stabilized test engines.

    (a) After you stabilize the test engine's emission levels, you may 
do scheduled maintenance, other than during emission testing, as the 
standard-setting part specifies.
    (b) You may not do any unscheduled maintenance to the test engine or 
its emission-control system or fuel system without our advance approval. 
Unscheduled maintenance includes adjusting, repairing, removing, 
disassembling, cleaning, or replacing the test engine. We may approve 
routine maintenance that is not scheduled such as maintaining the proper 
oil level.
    (1) We may approve other unscheduled maintenance if all of the 
following occur:
    (i) You determine that a part failure or system malfunction (or the 
associated repair) does not make the engine unrepresentative of 
production engines in the field and does not require anyone to access 
the combustion chamber.
    (ii) Something clearly malfunctions (such as persistent misfire, 
engine stall, overheating, fluid leakage, or loss of oil pressure) and 
needs maintenance or repair.
    (iii) You give us a chance to verify the extent of the malfunction 
before you do the maintenance.
    (2) If we determine that a part's failure or a system's malfunction 
(or the associated repair) has made the engine unrepresentative of 
production engines, you may no longer use it as a test engine.
    (3) You may not do unscheduled maintenance based on emission 
measurements from the test engine.
    (4) Unless we approve otherwise in advance, you may not use 
equipment, instruments, or tools to identify bad engine components 
unless you specify they should be used for scheduled maintenance on 
production engines. In this case, if they are not generally available, 
you must also make them available at dealerships and other service 
outlets.
    (c) If you do maintenance that might affect emissions, you must 
completely test the engine for emissions before and after the 
maintenance, unless we waive this requirement.

[[Page 666]]

    (d) If your test engine has a major mechanical failure that requires 
you to take it apart, you may no longer use it as a test engine.