[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: 40CFR1048.305]

[Page 562]
 
                   TITLE 40--PROTECTION OF ENVIRONMENT
 
         CHAPTER I--ENVIRONMENTAL PROTECTION AGENCY (CONTINUED)
 
PART 1048_CONTROL OF EMISSIONS FROM NEW, LARGE NONROAD SPARK-IGNITION 
ENGINES--Table of Contents
 
                Subpart D_Testing Production-line Engines
 
Sec. 1048.305  How must I prepare and test my production-line engines?

    (a) Test procedures. Test your production-line engines using either 
the steady-state or transient testing procedures in subpart F of this 
part to show you meet the emission standards in Sec. 1048.101(a) or 
(b), respectively. We may require you to test engines using the 
transient testing procedures to show you meet the emission standards in 
Sec. 1048.101(a).
    (b) Modifying a test engine. Once an engine is selected for testing 
(see Sec. 1048.310), you may adjust, repair, prepare, or modify it or 
check its emissions only if one of the following is true:
    (1) You document the need for doing so in your procedures for 
assembling and inspecting all your production engines and make the 
action routine for all the engines in the engine family.
    (2) This subpart otherwise specifically allows your action.
    (3) We approve your action in advance.
    (c) Engine malfunction. If an engine malfunction prevents further 
emission testing, ask us to approve your decision to either repair the 
engine or delete it from the test sequence.
    (d) Setting adjustable parameters. Before any test, we may adjust or 
require you to adjust any adjustable parameter to any setting within its 
physically adjustable range.
    (1) We may adjust idle speed outside the physically adjustable range 
as needed only until the engine has stabilized emission levels (see 
paragraph (e) of this section). We may ask you for information needed to 
establish an alternate minimum idle speed.
    (2) We may make or specify adjustments within the physically 
adjustable range by considering their effect on emission levels, as well 
as how likely it is someone will make such an adjustment with in-use 
engines.
    (e) Stabilizing emission levels. Before you test production-line 
engines, you may operate the engine to stabilize the emission levels. 
Using good engineering judgment, operate your engines in a way that 
represents the way production engines will be used. You may operate each 
engine for no more than the greater of two periods:
    (1) 50 hours.
    (2) The number of hours you operated your emission-data engine for 
certifying the engine family (see 40 CFR part 1065, subpart E).
    (f) Damage during shipment. If shipping an engine to a remote 
facility for production-line testing makes necessary an adjustment or 
repair, you must wait until after the after the initial emission test to 
do this work. We may waive this requirement if the test would be 
impossible or unsafe, or if it would permanently damage the engine. 
Report to us, in your written report under Sec. 1048.345, all 
adjustments or repairs you make on test engines before each test.
    (g) Retesting after invalid tests. You may retest an engine if you 
determine an emission test is invalid. Explain in your written report 
reasons for invalidating any test and the emission results from all 
tests. If you retest an engine and, within ten days after testing, ask 
to substitute results of the new tests for the original ones, we will 
answer within ten days after we receive your information.