Rolls Royce Allison Refurbishment Services 501K/T56 | 250/KS4 | TF41

501k501K Overhaul ServicesThe Allison 501K/T56 product line is one of S&S Turbine Services Ltd.'s mainstays for which we have full Level III overhaul and test capability for both industrial and aviation applications.

Parts sourcing from selected industrial, commercial and military surplus ensures our customers get the very best in parts quality and economy. As with all our supported turbine products, all overhaul and heavy maintenance parts are thoroughly inspected before placed in our, or a customer's, unit. Allison 501 parts and rental engine inventory levels vary due to demand, so please contact us for availability.

Operators of older 501K units may wish to take advantage of our hot section upgrade package. Through the application of ceramic thermal barrier coatings to selected hot section components, reliability and time between overhauls TBO) period can be enhanced without the big bills associated with the full KB5 upgrade that OEM shops perform. Too often we hear of 501K units that are in service at below 3.0 mW maximum load. Come overhaul time, the operator is forced to upgrade the unit to full KB5 status. This is an unnecessary expenditure that can be better served by upgrading the original design with economical thermal barrier coatings. We therefore would be pleased to evaluate your 501K unit so as to provide a comprehensive assessment of repair and labour costs to bring your unit to serviceable or overhauled condition.

rotor balanceDynamic Rotor Balanceair brakeTest Cell air brake dynamometer250 ks4 testAllison 250-KS4 Testing

Currently, we here at S&S TSL are the only independent facility in the world performing Rolls Royce/Allison 250-C20B conversions to Marine KS4 model status, including full water brake dynamometer testing to ensure adequate output torque from 0 N2 rotor speeds, up to full output shaft rpm. Give us a call for your KS4 maintenance requirements.

For details on our services covering the refurbishment of Military Allison TF41 units, please see our Rolls Royce Spey page.

250-ks4Allison 250 KS4 overhaul servicesmacu refurbTurbine MACU Refurbishment501k-reassemble501K Reassembly

Contact Us

S&S Turbine Services Ltd.

RR 1 Site 5 Comp 16
Fort St. John, British Columbia, Canada
V1J 4M6

Ph.  250 785 5272
Fx. 250 785 5269
Toll Free: 1-888-915-1199

E-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

About S&S Turbine Services Ltd.

S&S Turbine Services Ltd. is a family-owned and operated enterprise committed to delivering excellence in gas turbine overhaul, repair and maintenance services. Accuracy, high precision, and standards compliance that meet or exceed original equipment manufacturers' specifications characterize our work.  Find out more about us here.

Products We Service

At S&S Turbine Services LTD, we service and support the following brands: 

GENERAL ELECTRIC
ROLLS ROYCE
ALLISON
KAWASAKI
SOLAR
ORENDA
GARRETT AiRESEARCH
IVCHENKO