ANOVA Spreadsheet
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For a workshop manual or technical documentation regarding the TMP Type 12000 marine gearbox , the primary source is Thamesway Marine Products (TMP)
. They provide specific DIY repair guides and technical specifications that function as an informal workshop manual for these units. Official Technical Resources DIY Repair Guide Thamesway Marine Products DIY page
provides detailed instructions on disassembly, re-assembly, and specific parts required (such as oil seals, gaskets, and filters). Technical Specifications
: You can find critical data like max input speed (4000 rpm), oil capacity (2 1/4 pints for the main box), and oil pressure (95 to 100 p.s.i.) on their Transmission Types Operational Information FAQ/Rotation page
explains engine input rotation and how the control valve operates for different reduction ratios. Thamesway Marine Products Key Maintenance and Repair Details : Use standard engine lubrication oil (SAE 20 multigrade). Filter Replacement
: The oil filter is located on top of the main gearbox and is a standard part available from most motor factors. Special Tools : Disassembly often requires a 7/8" A/F socket with a maximum outside diameter of to undo output coupling nuts. Common Issues
: Low oil pressure is often indicated by a flickering pressure gauge, which can prevent the unit from going into gear. nicholson38.org Contact for Specific Manuals If you need a physical or complete PDF workshop manual, Thamesway Marine Products
typically stocks them and offers a reconditioning service for the 12000 series. for an oil seal or gasket kit?
Gearbox – TMP 12000 – wanted - Nicholson 38 Owners Group 29 Nov 2024 —
Every bolt, from the M6 pan bolts to the M24 output flange nut, is listed with a specific torque angle and lubrication condition (dry, oiled, or Loctite-coated). The Top manual includes torque-to-yield protocols for stretch bolts, which are often omitted in pirated or incomplete PDFs.
Avoid eBay sellers offering "instant PDF download" for $9.99. These are almost always outdated, incomplete, or stolen scans. Authorized sources include: tmp gearbox workshop manual top
Price range: 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.
YouTube and Forums: Websites like YouTube, Reddit, and specialized automotive or industrial equipment forums can provide valuable insights and tips from experienced mechanics and hobbyists.
Manufacturer Websites: Sometimes, manufacturers will have downloadable PDFs of their workshop manuals or guides for specific models of gearboxes or vehicles.
Unlike generic manuals, the Top edition details specific heat induction for bearing races. For example:
Identify the Gearbox Model: Find out the exact model or type of the gearbox you're working with.
Check Manufacturer's Website: Look for the manufacturer's official website for technical documentation.
Use Online Search Engines: Utilize search engines with specific keywords like the gearbox model, "workshop manual," and "top cover" or "top gearbox."
Consult Automotive or Industrial Libraries: Some libraries or online repositories have manuals and technical guides available for loan or download.
If you have more details or a specific model in mind, providing that information could help in giving a more accurate and helpful response.
TMP Type 12000 marine gearbox, manufactured by Thamesway Marine Products (TMP) For a workshop manual or technical documentation regarding
, is a common hydraulic unit found in many older sailing yachts and workboats. Below is a write-up on maintenance, identification, and common workshop procedures based on available technical data. 1. Identification and Specifications
Before starting any work, identify your specific model using the serial plate usually located on the top of the gearbox. Thamesway Marine Products Model Variants
: Available in Direct Drive (in-line), 2:1 Reduction, and 3:1 Reduction.
: Standard units (ID starting with "12") are for right-hand rotation engines. Specialized versions for engines like Ruston Hornsby or Coventry (ID starting with "21") have reversed oil pumps and are not interchangeable. Operating Pressure
: The main hydraulic system typically operates at approximately 2. Routine Maintenance : Use standard SAE #30 engine oil
. Avoid multi-grade oils (like 15W40), as they can cause clutch slippage.
: Check the dipstick (often integrated with the filler plug on top). The difference between "fill" and "full" is very small. Oil Filter
: A standard screw-on filter is located on top of the main box. These are often interchangeable with common automotive filters.
: Check cooling water connections for corrosion. If the gearbox overheats, inspect the oil cooler and its sacrificial anodes. 3. Workshop & D.I.Y. Repair Procedures
If you are performing a teardown or "top-down" inspection, follow these critical steps: TMP gearbox assembly DIY | YBW Forum TMP Industrial Direct (official website) – Buy a
The TMP (Thamesway Marine Products) gearbox is widely described in community forums and technical documentation as a robust but complex piece of marine equipment that is generally not DIY-friendly for major overhauls. While simple maintenance like oil changes is straightforward, internal repairs are often cited as being "not for the faint-hearted" due to the precision required during assembly. Technical Manual & Service Insights
Manual Availability: Official manuals and technical cutaway diagrams with part numbers are available directly from Thamesway Marine Products. Maintenance Essentials:
Oil Type: Use standard engine oil for both the main gearbox and reduction gear.
Oil Filter: The filter (often a Maestro/Metro 1.3 type) is located on top of the main box and should be changed regularly to maintain pressure.
Capacity Warning: The unit has a very small oil capacity; the difference between the "fill" and "full" marks on the dipstick is minimal. Common Issues:
Slow Engagement: Delayed forward engagement (e.g., 20 seconds) may require "blipping" the revs to seat the conical clutch plates.
Corrosion: Internal cooling water connectors and aluminum castings are prone to corrosion, which can lead to seawater leaking into the oil. Community Perspectives
Experts and owners often emphasize the difficulty of separation and the precision needed for internal components like the hydraulic pump and clutch linings.
“DIY repairs are said to be not for the faint hearted though, as you say, it looks straightforward?” YBW Forum · 6 years ago
“Separation can require lots of heat, patience, and care to avoid damage to the faces of the castings.” Thamesway Marine Products
“It’s very easy to overfill the box as it has a very small oil capacity - nearly half the oil's in the filter.” YBW Forum · 23 years ago Workshop & Repair Considerations TMP Gearbox experience anybody? - YBW Forum
Even experienced rebuilders fall into traps. The Top manual explicitly warns against:
