JACTest Monitoring Center Test Monitoring Center Report to the Mack Test Surveillance Panel June 17,...

JACTest Monitoring Center

Test Monitoring CenterReport to the

Mack Test Surveillance PanelJune 17, 2002

Montreal


T-8/T-8E Reference Oil Testing Summary

• Test Activity– Moderately Low

• Currently Calibrated– 3 Labs– 7 Stands

• Current Alarms– None


T-8/T-8E Reference Oil Testing Summary

• Severity Trends (through April 2002 period)– VI38: 0.41 cSt mild– RV48: 0.12 rv units mild– RV2: no severity trend

• Precision– All three parameters

• Within historical levels

• Improving compared to recent periods


T-9 Reference Oil Testing Summary

• Test Activity– Very Low

• Currently Calibrated– 1 Lab– 2 Stands

• Current Alarms– None



• Severity Trends (since January 1, 2000)– ALW: 2.1 microns mild– Delta PB: 5 ppm mild– TRWL: 14 mg severe

• Precision– No estimates or comparisons available due to low

activity



• Test Activity– Moderately Low

• Currently Calibrated– 5 Labs– 12 Stands

• Current Alarms– CLW: Severity, Mild Direction– TRWL: Severity, Mild Direction



• Severity Trends (since March 2002)– CLW: 3.8 microns mild– TRWL: 28 mg mild

• Precision– PB, PB2, OC: show improvement– CLW, TRWL: show degradation


T-10A Reference Oil Testing Summary

• Alarms– none

• Severity Trends (since January 1, 2002)– MRV: 151 cP severe


T-10Liner Wear and Top Ring Weight Loss

• Severity Issues– Noted in May during review of reference data for

target update– Investigated by TMC, Mack, and TEI


T-10Severity Investigation

• Issues Examined– Lab influences– Hardware batches– Reference oils– Liner measurements– Differences in operating parameters



• General Observations– Hardware batches

• Change in batch from D to F

• Possible change in liner supplier, Mack to confirm

• Difference in liner surface finish significant, but no impact found on results

• Batch F hardware has been run at Labs A and G only

• T-9 results on same hardware do not confirm T-10 results



• General Observations– Liner measurements

• Labs A and G switch from Talysurf to PDI

• Differences seen in results– Lab A: 32.3 Talysurf 29.6 PDI

– Lab G: 34.4 Talysurf 25.9 PDI

• Lab G switch coincides with batch F

• Round robin at same time shows good agreement in measurements throughout industry



• General Observations– Differences in operating parameters

• Blowby– Lab G extremely low compared to industry

– Unknown if difference is real or measurement problem

– Potential impacts??

• Humidity– Lab D extremely high compared to industry

– Unknown if difference is real or measurement problem

– Potential impacts??



• Cylinder Liner Wear– Lab Influence

• Lab G mild

– Hardware Batch• No effect found

– Reference Oil• No effect found



• Cylinder Liner Wear– Liner Measurements

• Effect not likely

• Next round robin to confirm

– Operating Differences• Effect unknown but not likely

– Differences existed prior to severity changes



• Cylinder Liner Wear– Conclusion

• Most likely cause of mild shift is Lab G



• Top Ring Weight Loss– Lab Influence

• Labs A and G mild

– Hardware Batch• Labs A and G: Batch F

• Labs B, D, and F: Batch D

• Batch F results are mild

– Reference Oil• No effect found



• Top Ring Weight Loss– Operating Differences

• Effect unknown but not likely– Differences existed prior to severity changes



• Top Ring Weight Loss– Conclusions

• Hardware batch may be driving mild shift

• Lab effects unknown



• Proposed Actions– Update Test Targets

• 12 or 13 tests?

• Use pooled standard deviation for CLW to account for lab differences

– Complications: Top Ring Weight Loss• Batch F run only at two labs

• Batch G to be introduced shortly


T-10 Targets and Proposed Targets

CLW TRWL OC PB EOT PB 250-300

Current 32.5 / 3.4 134 / 26 49.6 / 10.9 3.1298 / 0.2847 8.2 / 5.2

820-2

13 tests

29.7 / 3.9 110 / 21 50.6 / 6.6 3.1529 / 0.2388 8.1 / 3.3

820-2

12 tests

30.4 / 3.4 111 / 21 50.6 / 6.9 3.1899 / 0.2067 8.2 / 3.3


Items for Surveillance Panel Consideration

• Liner Wear Measurement Procedure– Currently maintained in T-9 standard– Options

• Keep in T-9. Update via Information Letter.

• Remove from T-9. Change to referenced document, maintained at TMC. Both T-9 and T-10 updated via Information Letter.



• T-10 Ballot – Information Letter 02-1– Comment regarding Section 8.4.1 on servicing of

injectors• Currently: Servicing of injectors is recommended every

300 h. Resetting of injector opening pressure is recommended if pressure is outside the specification

• Suggested: Inspection of injectors, and cleaning if necessary, is required every 300 h. Resetting of injector opening pressure is required if pressure is outside the specification



• T-10 Quality Index– Operational Plots / Capability Study– Review with lab engineers to establish thresholds– Proposal to be developed by TMC for panel

consideration

JACTest Monitoring Center Test Monitoring Center Report to the Mack Test Surveillance Panel June 17,...

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