The following critical characteristics shall be inspected or tested on each diesel power package to which an approval marking is affixed:
- (a) Finish, width, planarity, and clearances of surfaces that form any part of a flame-arresting path.
- (b) Thickness of walls and flanges that are essential in maintaining the explosion-proof integrity of the diesel power package.
- (c) Size, spacing, and tightness of fastenings.
- (d) The means provided to maintain tightness of fastenings.
- (e) Length of thread engagement on fastenings and threaded parts that ensure the explosion-proof integrity of the diesel power package.
- (f) Diesel engine approval marking.
- (g) Fuel rate setting to ensure that it is appropriate for the intended application, or a warning tag shall be affixed to the fuel system notifying the purchaser of the need to make proper adjustments.
- (h) Material and dimensions of gaskets that are essential in maintaining the explosion-proof integrity of the diesel power package.
- (i) Dimensions and assembly of flame arresters.
- (j) Materials of construction to ensure that the intake system, exhaust system, cooling fans, and belts have been fabricated from the required material.
- (k) Proper interconnection of the coolant system components and use of specified components.
- (l) Proper interconnection of the safety shutdown system components and use of specified components.
- (m) All plugs and covers to ensure that they are tightly installed.
- (n) The inspections and tests described in the diesel power package checklist shall be performed and all requirements shall be met.