Teledyne TSIO-360-RB, Maintenance Manual

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20-14
TROUBLE PROBABLE CAUSE CORRECTION
Valve seats worn and leaking,, piston
rings worn or stuck in ring lands See Section 20-6 Cylinder Assembly
Maintenance "Cylinders."
Low Compression Piston rings excessively worn See Section 20-6 Cylinder Assembly
Maintenance "Cylinders."
Valve faces and seats worn See Section 20-6 Cylinder Assembly
Maintenance "Cylinders."
Excessively worn cylinder walls See Section 20-6 Cylinder Assembly
Maintenance "Cylinders."
Valve seats worn and leaking, piston
rings worn or stuck in ring lands See Section 20-6 Cylinder Assembly
Maintenance "Cylinders."
Continuous Fouling Of
Spark Plugs Piston rings excessively worn or
broken See Section 20-6 Cylinder Assembly
Maintenance "Cylinders."
Piston rings not seated See Section 20-6 Cylinder Assembly
Maintenance "Cylinders."
Cylinder has been overheated See Section 20 -6 Cylinder Assembly
Maintenance "Cylinders."
Cylinder bore out of round See Section 20-6 Cylinder Assembly
Maintenance "Cylinders."
Valve seats worn and leaking piston
rings worn or stuck in ring lands See Section 20-6 Cylinder Assembly
Maintenance "Cylinder."
Sluggish Operation and
Low Power Output Valve seats worn and leaking, piston
rings worn or stuck in ring lands See Section 20-6 Cylinder Assembly
Maintenance "Cylinder."
Excessive Crankcase Pressures
The following troubleshooting test is recommended when excessive crankcase pressures
are suspected. An airspeed indicator may be used as a substitute for a water manometer.
The indicator can be plumbed into a field modified oil cap, dipstick housing or timing plug,
depending on engine model, to determine excessive crankcase pressure.
Engines with timing plugs can be modified or use P/N 630415 plug which is already drilled
for attachment of the fitting for the airspeed indicator. On engines that incorporate a
separate dip stick tube, the rubber hose to the airspeed indicator can be connected directly
to this tube and secured with a clamp.
By the use of the following table it will be possible to obtain actual water pressure (in H
2
O)
when checking a suspect engine. Run engine on the ground at full power to check for
excessive pressure. If the pressures are excessive, check the system with crankcase
breather system disconnected from the engine vent standpipe. If the pressure then drops
appreciably the breather system should be checked for possible blockage caused by, but
not limited to, the air oil separator, collapsed lines, sludge build up, wet vacuum pump, etc.
After disconnecting the breather system if the pressure is still high the cylinders must be
checked for blow-by.
If the aircraft has an air oil separator installed in the breather system it will cause a higher
airspeed reading when connected because of the back pressure. When the ground run has
been finished the breather system must be reinstalled.