Experts and owners often emphasize the difficulty of separation and the precision needed for internal components like the hydraulic pump and clutch linings.
Expect to pay $450–$850 USD for the genuine Top edition. While steep, it is less than the cost of one ruined gearbox due to an assembly error.
Gearbox – TMP 12000 – wanted - Nicholson 38 Owners Group 29 Nov 2024 — tmp gearbox workshop manual top
This is your first, and arguably most important, reference point. Getting the oil type and capacity wrong can cause immediate damage. Official sources, like the , are the gold standard here. It confirms the TMP 12000 Mk II recommended a 0.7 imp. pint (0.4 litre) capacity for the main gearbox using SAE 20 lubricating oil , and the reduction gearbox took 2.25 imp. pints (1.28 litres) also of SAE 20 oil .
Even experienced rebuilders fall into traps. The Top manual explicitly warns against: Experts and owners often emphasize the difficulty of
: Official manuals and technical cutaway diagrams with part numbers are available directly from Thamesway Marine Products . Maintenance Essentials :
A critical section of the details how input rotation matches propeller rotation. Misidentifying your configuration can result in running the oil pump backward, causing immediate clutch slippage and catastrophic component wear. 1. Engine Rotation Exceptions Gearbox – TMP 12000 – wanted - Nicholson
There is nothing worse than reinstalling a gearbox only to realize a shift rail was installed backward. This results in the dreaded "rebuild loop"—taking it all apart again.
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This section of the manual is crucial. But reading it is very different from doing it. The TMP gearbox is "heavy and awkward to handle," and its "mix of alloy castings and steel studs" means that studs can easily 'grow' into their holes due to galvanic corrosion in a saltwater environment. The manual's assembly hints include tips like tapping with a felt-tipped hammer to separate the gearbox and reduction box, and working on the output coupling nuts while the box is still attached to the engine for leverage.
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