SwRI: Sequence IVA Test Method for ILSAC GF-3/GF-4 and API SL/SM

  image of stand that runs the Sequence IVA test to evaluate a lubricant?s performance in preventing camshaft lobe wear in an overhead camshaft engine
 

The Sequence IVA procedure at SwRI evaluates a lubricant's performance in preventing camshaft lobe wear in an overhead camshaft engine.

The Sequence IVA procedure (ASTM D 6891) evaluates a lubricant’s performance in preventing camshaft lobe wear in an overhead camshaft engine. Taxi cab, light-delivery truck, or commuter service is simulated.


Sequence IVA Test Equipment and Procedure

The Sequence IVA test fixture is a 1994 Nissan KA24E, 2.4-liter, water-cooled, fuel-injected engine, 4-cylinder in-line, overhead camshaft with 2 intake valves, and 1 exhaust valve per cylinder.


The test is a 100-hour test involving 100 hourly cycles. Each cycle consists of 2 operating modes or stages. Unleaded “Haltermann KA24E Green” fuel is used.

 

 

STAGE 1

STAGE 2

Time, minutes

  50

     10

Engine Speed, rpm

 800 1,500

Engine Torque, N-m

   25      25

Oil Cylinder Head Temp, °C

   49      59

Coolant Temp, °C

   50      55


Sequence IVA Test Results

At the end of the test, each of the 12 cam lobes is measured at 7 locations using a surface profilometer, which measures maximum depth of wear. Measurements of wear on all 7 positions of each lobe are added; then all 12 lobe measurements are averaged for the wear result. This result is the primary evaluation for the test.


At 100 hours, the used oil is evaluated for:

  • Kinematic viscosity

  • Fuel dilution

  • Wear metals: iron (Fe) and copper (Cu)

Sequence IVA Pass/Fail Criteria

 

PARAMETER

PASS LIMIT

GF-3

 Average cam wear, (mm) maximum

120

GF-4

 Average cam wear, (mm) maximum   90

 

PASS

FAIL


For more information about the Sequence IVA procedure capabilities at Southwest Research Institute (SwRI) or how you can contract with SwRI, please contact Eric Liu at eliu@swri.org or (210) 522-5937.

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Southwest Research Institute® (SwRI®) is an independent, nonprofit, applied engineering and physical sciences research and development organization with 12 technical divisions using multidisciplinary approaches to problem solving. The Institute occupies more than 1,200 acres and provides nearly two million square feet of laboratories, test facilities, workshops, and offices for more than 3,300 employees who perform contract work for industry and government clients.