12-34 DF9.9T/TH “K8” (’08) MODEL
THERMAL VALVE
The PT system incorporates a thermal valve L for protection of the internal components, should excessive
downward force be exerted on the lower unit with the motor in a tilted position, or (in the case of an impact in
reverse gear), the outboard clamp/swivel brackets and the boat transom.
Should the propeller strike an underwater object whilst in reverse gear, a build up of pressure will be induced
in the lower cylinder chamber F, whereby the outboard mounting bracket and/or the boat transom may sus-
tain damage. To prevent this, the thermal valve L will open to relieve the oil pressure, thereby softening the
impact.
Internal PT circuits are protected, as the thermal valve L will open to reduce oil pressure (caused by either
hot climate or abnormally heavy usage).
Tilt rod
Tilt piston
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