Billjratt
Well-Known Member
This is the text of a PDF that I can't put on Photobucket for some reason. The photos are missing, but it may be of interest to TMP thrashers.
I can't get more than 2.2krpm with my present prop, so I bypassed the units in plastic piping -much neater and less worry.
T M P 12000 Marine Gearbox
(Thamesway Marine Products)
Appleyard Lincoln started fitting Perkins 4.107 diesel engines in many of the Elysian 27's and practically every Elysian 34 that
left the yard in Ely. Perkins were supplying TMP gearboxes as part of a ‘turn-key’ package ,complete with bell housing , drive plate
and coupling. From the three popular models listed below, to the best of our knowledge only the ‘Direct Drive’ model and ‘2:1
reduction’ models were installed into Elysian type boats.
I T SHOULD BE NOTED THAT THIS BOX WAS ALSO PRODUCED BY NICOR MARINE
How does it work? (There really is no easy way of explaining this)
The gearbox incorporates an epicyclic gear train for ‘Astern’ running and the input and output shafts are locked together in ahead to
give a direct through drive. There is a small reduction in output speed in ‘Astern gear’. In ‘Neutral’, when the engine is running, the
output shaft is prevented from rotating by a hydraulically-actuated automatic brake. When the engine is stopped, the brake retracts,
so that the propeller shaft is free to rotate. Gear selection is achieved hydraulically by moving the control lever located on top of the
main box. The gearbox contains its own oil pump and oil reservoir. All bearings in the direct drive version are force lubricated and a
renewable element filter is fitted. In the case of the ‘Reduction’ model the bearings are bath lubricated although bearings in the main
box are force lubricated as in the case of the ‘Direct Drive’ version.
Water Cooling
Water cooling of the gearbox is advisable when used on engines with a maximum rotational speed in excess of 2000 rpm and
essential when used on engines with a maximum rotational speed in excess of 3000 rpm. The cooling water may be taken from the
engine cooling supply system, but the cooling water must pass through the gearbox water jacket before entering the engine.
Things to remember
! Do not exceed 4000 rpm
! Always use a good 15/40 multigrade oil
! Do not stop the engine with the gearbox in gear.
(This may result in the gearbox locking in gear, and require the box to be dismantled to
free the lock)
! The gearbox is hydraulic, always keep the oil level to the mark using the dipstick.
! Avoid over filling with oil, it can cause overheating and damage oil seals
! Allow plenty of time between gear changing from forward to reverse.
! The water cooling chamber must be drained completely prior to ‘laying up’ during the
winter as ice formation within the chamber may result in damage to the aluminium
casing. In some installations the drain plug is not easy to reach , if this is the case then
a 50/50 mix of antifreeze and water should be flushed through the cooling system.
Want to know more ?
Thamesway Marine Products are still active and provide a full parts/repair service.
They have a very good web-site which can be found at the following address:-
www.thameswaymarineproducts.co.uk
Or contacted at:-
96 Thames Street
Weybridge
Surrey
KT13 8NH
TEL - 01932 843072
Example of Epicyclic gearbox
I can't get more than 2.2krpm with my present prop, so I bypassed the units in plastic piping -much neater and less worry.
T M P 12000 Marine Gearbox
(Thamesway Marine Products)
Appleyard Lincoln started fitting Perkins 4.107 diesel engines in many of the Elysian 27's and practically every Elysian 34 that
left the yard in Ely. Perkins were supplying TMP gearboxes as part of a ‘turn-key’ package ,complete with bell housing , drive plate
and coupling. From the three popular models listed below, to the best of our knowledge only the ‘Direct Drive’ model and ‘2:1
reduction’ models were installed into Elysian type boats.
I T SHOULD BE NOTED THAT THIS BOX WAS ALSO PRODUCED BY NICOR MARINE
How does it work? (There really is no easy way of explaining this)
The gearbox incorporates an epicyclic gear train for ‘Astern’ running and the input and output shafts are locked together in ahead to
give a direct through drive. There is a small reduction in output speed in ‘Astern gear’. In ‘Neutral’, when the engine is running, the
output shaft is prevented from rotating by a hydraulically-actuated automatic brake. When the engine is stopped, the brake retracts,
so that the propeller shaft is free to rotate. Gear selection is achieved hydraulically by moving the control lever located on top of the
main box. The gearbox contains its own oil pump and oil reservoir. All bearings in the direct drive version are force lubricated and a
renewable element filter is fitted. In the case of the ‘Reduction’ model the bearings are bath lubricated although bearings in the main
box are force lubricated as in the case of the ‘Direct Drive’ version.
Water Cooling
Water cooling of the gearbox is advisable when used on engines with a maximum rotational speed in excess of 2000 rpm and
essential when used on engines with a maximum rotational speed in excess of 3000 rpm. The cooling water may be taken from the
engine cooling supply system, but the cooling water must pass through the gearbox water jacket before entering the engine.
Things to remember
! Do not exceed 4000 rpm
! Always use a good 15/40 multigrade oil
! Do not stop the engine with the gearbox in gear.
(This may result in the gearbox locking in gear, and require the box to be dismantled to
free the lock)
! The gearbox is hydraulic, always keep the oil level to the mark using the dipstick.
! Avoid over filling with oil, it can cause overheating and damage oil seals
! Allow plenty of time between gear changing from forward to reverse.
! The water cooling chamber must be drained completely prior to ‘laying up’ during the
winter as ice formation within the chamber may result in damage to the aluminium
casing. In some installations the drain plug is not easy to reach , if this is the case then
a 50/50 mix of antifreeze and water should be flushed through the cooling system.
Want to know more ?
Thamesway Marine Products are still active and provide a full parts/repair service.
They have a very good web-site which can be found at the following address:-
www.thameswaymarineproducts.co.uk
Or contacted at:-
96 Thames Street
Weybridge
Surrey
KT13 8NH
TEL - 01932 843072
Example of Epicyclic gearbox
