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FED-STD-791 Lubricants, Liquid Fuels, And Related Products, Testing Method OfThis test method standard is composed of standard test methods for sampling, inspecting and testing lubricants, liquid fuels and related products. It is issued pursuant to the Federal Property and Administration Services Act of 1949, as amended and its application to the purchase of commodities referred to herein is mandatory on all Federal agencies.

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'�NOTE:This draft dated 15 April 2006' by DasH - Page 190 of 460

FED-STD-791D

Crinkled carbon

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Same as for smooth carbon, ridged or uneven surface, not

smooth

Less than 1/64 in thickness

Light

1/64 to 3/64 in thickness

Medium

3/64 in thickness or more

Heavy

Same as for smooth carbon, blistered, bubbled

Blistered

-----

Less than 1/64 in thickness

Light

carbon

1/64 to 3/64 in thickness

Medium

3/64 in thickness or more

Heavy

-----

Same as for smooth carbon, flaked or broken blisters,

peeling

Flaked carbon

Light

Less than 1/64 in thickness

Medium

1/64 to 3/64 in thickness

3/64 in thickness or more

Heavy

1 Some difficulty may be encountered in distinguishing between light smooth carbon deposit

and heavy varnish. The varnish deposit appears shiny and glossy and upon scraping

indicates a tacky consistency or thin, brittle flaking. The smooth carbon deposit appears

dull and lusterless and upon scraping reveals a grainy consistency.

Heater-mount front.

Heater-mount rear.

Seal plate.

Test bearing.

6.7.1.5 The specific areas rated on each of the six major items are as follows:

a. End cover: The surface of the end cover normally exposed to test oil.

b. Spacer and nut: The entire surface of the spacer, nut, lock-washer, and flat washer (all

considered to be one piece) normally exposed to test oil.

c. Heater-mount front: The surface of the heater-mount front which is parallel to the plane

of the end cover and normally exposed to test oil. The portion of the heater-mount front

which contacts the heater-mount retainer is not included in the area rated.

d. Heater-mount rear: The surface of the heater-mount rear which is parallel to the plane

of the end cover and normally exposed to test oil.

e. Seal plate: The visible surface of the seal plate, with the slinger in place, normally

exposed to test oil.

f. Test bearing: The test bearing is divided into four section for rating purposes. These

four sections are in turn broken down into eleven specific areas as follows:

1. Front

Rollers

2. Rear

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