Filter
Top Products
Phone: 864.660.8036
Fax: 864.834.6670
E-mail: dougglass@lctllc.com
100 Roe Road
Travelers Rest, SC 29690
Liquid Combustion
Technology
Oil Drain Tube Oil Seepage 9/28/2011
PROBLEM DEFINITION:
Oil Seepage from 35mm Drain Tube Reported by customer. After internal inventory audit, seepage was con-
firmed. Further Investigative Analysis determined:
35mm Oil Tube Face (crush washer engagement area) does not meet surface finish drawing specification of
6.3um
Short Term Corrective Action:
LCT recommends increasing drain bolt torque to 23lb-ft to allow crush washer to fill excessive ridges/valleys
caused by the out of specification surface finish:
Capability study was conducted on 30pc of Oil Drain Tubes removed from inventory product
Engines were filled with oil and monitored over a 24hr period
5pcs of the 30 were observed to have an oil witness mark below oil drain bolt (35mm drain tube
side)
Oil Drain Tubes were removed from engines and service Oil Drain Tubes (with correct surface fin-
ish) installed and torqued and engines were placed back into inventory
Removed Oil Drain Plugs were then torqued to 23lb-ft and pressurized in a submerged state to
look for joint seal failure. No failures were observed after torque was increased to 23lb-ft
Long Term Corrective Action:
Currently working with supplier to determine root cause of oil drain tube missing the facing operation
Will update with full 8D report once final root cause has been determined
Containment Activities:
Inventory audits were conducted with product in South Carolina warehouse
Product with May 25th date code (>15000 engine serial number) was discovered to have the “non faced”
machining condition
Product from August 6th (<8000 engine serial number in August) was discovered to have correct machined
face surface area
Total engine exposure based on the 5/30 statistical sample—5689
30pc Oil Drain Tube Samples
- Samples were torqued to 23lb-ft
- Samples were pressurized and sub-
merged
- No leaks were detected