SOUTHWEST RESEARCH INSTITUTE

 

Sequence VE Test
(ASTM D 5302)
 

Search SwRI

    

SwRI Home | Print Version

Gasoline/ILSAC GF-3 Procedures

Brochures

Abstracts

Related Information

Contact Us

SwRI Information

Home
 

The Sequence VE test, ASTM D 5302, simulates moderate-temperature taxicab service, urban and suburban delivery service, and job-commuting service, and it screens crankcase oils for cylinder bore and piston ring wear in:

  • Methanol-fueled engines

  • Ethanol-fueled engines

  • Natural gas-fueled engines

Engine oil category specifications for the Sequence VE test are:

  • API SG

  • API SH

  • API SI

  • ILSAC GF-1

  • ILSAC GF-2

  • ILSAC GF-3

  • MIL-L-21260D

  • MIL-L-46167B

Sequence VE Test Equipment and Procedure

A fuel-injected Ford 2.3-liter gasoline engine, 4-cylinder, with sliding followers, overhead camshaft, coolant-jacketed rocker cover, and camshaft baffle is used for this test.

 

The test is a 288-hour test with 72 cycles, with each cycle consisting of 3 differing operating specifications or stages. Unleaded Phillips J fuel is used, and engine blowby is intentionally increased. Rocker cover jacket temperature is cycled.

 

 

STAGE 1

STAGE 2

STAGE 3

Time, minimum

  120

    75

450

Engine Speed, rpm

2,500

2,500

750

Load, bhp

      33.5

       33.5

       1.0

Oil Temp, °F

  155

  210

115

Coolant Temp, °F

  125

  185

115

Rocker Cover Temp, °F

    85

  185

  85


Sequence VE Test Results

At the end of the test, sludge deposits are rated on:

  • Rocker arm cover

  • Cam baffle

  • Valve deck

  • Front seal housing

  • Cylinder block

  • Oil pan

The following are rated for varnish deposits:

  • Piston skirts

  • Rocker arm covers

  • Cam baffles

  • Cylinder walls

  • Oil pan

Inspections are performed for hot stuck piston compression rings.

The following are rated for clogging:

  • Oil pump screen

  • Piston oil rings

  • Camshaft oil feed holes

Measurements are taken for:

  • Cam lobe wear

  • Weight loss of follower arms

Used lubricant analysis includes:

  • Kinematic viscosity

  • Iron content

  • Copper content

  • Silicon content

  • Pentane insolubles

  • Fuel dilution

Sequence VE Pass / Fail Criteria

 

PARAMETER

PASS LIMIT

Average engine sludge

9.0 minimum

Rocker cover sludge

7.0 minimum

Average engine varnish

5.0 minimum

Piston skirt varnish

5.0 minimum

Average cam wear

127 μm, maximum

Maximum cam wear

380 μm, maximum

Oil ring clogging (report only, limit waved)

15%, maximum

Oil screen clogging

20%, maximum

Hot stuck compression rings

NONE

 

For more information about the Sequence VE (ASTM D 5302) test capabilities at Southwest Research Institute (SwRI) or how you can contract with SwRI, please e-mail William Buscher, or call (210) 522-6802.
 

Contact Information

William Buscher

Sequence VE Test

(210) 522-6802

wbuscher@swri.org

Related Terminology

Sequence VE test

ASTM D 5302

API SG

API SH

API SI

ILSAC GF-1

ILSAC GF-2

ILSAC GF-3

MIL- L-21260D

MIL-L-46167B

crankcase oils

cylinder bore

piston ring wear

methanol

ethanol

natural gas

engines

taxicab

2.3-liter

gasoline

4-cylinder

Related Information

Printable PDF Poster

| Engine Lubricants Research Department | Fuels and Lubricants Research Division | SwRI Home |

Southwest Research Institute® (SwRI®), headquartered in San Antonio, Texas, is a multidisciplinary, independent, nonprofit, applied engineering and physical sciences research and development organization with 11 technical divisions.

September 06, 2007