Generally the TMP Type 12000 Gearboxes are
fitted to engines which have a Righthand Rotation,
(this is where the engine turns clockwise looking
at the front of the engine.) But there are
exceptions such as on Ruston Hornsby and Coventry
engines where the flywheel is at the front of the
engine. ( Gearbox ID starts "21"). On
these versions the gearbox oil pump runs the
opposite way. The gearboxes are not
interchangeable unless one fits the correct oil
Gearbox Output Rotation.
A Direct Drive Gearbox turns the propeller
as engine rotation.
A 2 pinion Reduction Box turns the
propeller the opposite way to the engine rotation.
A 3 Pinion Reduction Gearbox turns the
propeller as engine rotation.
Gearbox Control Lever.
Irrespective of the Engine or Gearbox
Rotation the control lever works in direction of
SENSE, ... The lever on the control valve goes
forward for forwards and backwards for backwards.
If your boat goes
forward with the control lever pointing aft...YOU HAVE THE WRONG HAND PROP.
will not run in reverse continually.