Unscheduled Maintenance; Cylinder Compression (Leakage) Check; Leakage Checks; Static Seal - Continental Motors TSIO-520-BE Maintenance And Operator's Manual

17. Exhaust:
18. Turbochargers:
19. Wastegate:
20. Adjustment & Repairs:
21. Engine Condition:
Check all joints for conditions and leaks.
Check freedom of rotation.
Check operation and condition.
Perform service as required on any items that are not within
specifications.
Perform complete run up. Check engine for fuel or oil leaks before
returning to service.
NOTE ... Refer to TSI0-520-BE Overhaul Manual X30574A or applicable Service Bulletins for proper
procedures and limits.
9-6 UNSCHEDULED MAINTENANCE
Detailed information required for component part replacement, system adjustments, accessory
replacement/repair, top overhaul etc., can be found in the "Related Publications" listed in Chapter 1.
No unscheduled maintenance of the categories listed above should be attempted without consulting the
applicable related publications.
The Time Between Overhaul (TSO) for the TSI0-520-BE is 2000 hours. Those accessories supplied with this
engine by TCM are considered to have the same TBO as the engine with the criteria for service and
longevity as outlined in TCM TBO Service Bulletin 86-6R1 or current revisions as applicable.
9-7 CYLINDER COMPRESSION (Leakage) CHECK
The differential pressure test is an accepted method of determining cylinder condition by measuring air
pressure loss past the pistons, rings and valves. The operation of the equipment is based on the principle
that, for any given airflow through a fixed orifice, a constant pressure drop across the orifice will result. The
differential pressure test is a regular part of the 100 hour or annual inspection on Teledyne Continental
engines.
Reports of incorrect cylinder leakage check results caused by improver use of test equipment and/or by the
use of faulty test equipment have been received.
To accurately accomplish a leakage check, use the following information on leakage and use of the Master
Orifice Tool (Ref. Figure 9-1) to calibrate the leakage checking equipment used on Teledyne Continental
engines.
LEAKAGE CHECKS
Cylinder leakage is broken down into two areas, the "Static Seal" and the "Dynamic Seal".
Static Seal
The static seal consists of the valve to valve seat seal, spark plug to spark plug port seals and cylinder head
to barrel seal (Ref. Figure 9-2). No leakage of the static seal is permissible.
9-6