TMP Type 12000 Marine Gearbox , manufactured by Thamesway Marine Products (TMP)
, is a specialized hydraulic transmission widely used in marine applications. While professional workshop manuals are often sourced directly from the manufacturer, the following technical summary serves as a detailed reference for operation, maintenance, and repair based on official technical data and user experience. 1. Technical Specifications
Key data for the Type 12000 model across its different configurations: Maximum Input Speed : 4000 r.p.m. Maximum Input Torque : 100 lbs ft Oil Pressure
: 95 to 100 p.s.i. (Standard operation around 80 p.s.i. is also common) Oil Capacity Main Box: 2 1/4 Pints Reduction Box: 1 Pint Lubrication : Engine lubrication oil, specifically
. Avoid multigrade oils like 10W40, as they may cause clutch slippage. Oil Filter : Typically a spin-on canister (e.g., TMP Part No. TM 12773 Fram PH2869 Wix WL7213 2. Operation & Identification Engine Rotation : Standard units are for Right Hand (Clockwise) engine rotation. Output Rotation Direct Drive: Same as engine rotation. 2 Pinion Reduction: Opposite to engine rotation. 3 Pinion Reduction: Same as engine rotation. Control Lever
: Operates by "sense" (forward for ahead, backward for astern). 3. Maintenance Procedures diy.htm - Thamesway Marine Products
"TMP" usually refers to the joint venture between Toyota and Yamaha, producing sterndrives used in Toyota Epic boats and certain Yamaha boats. These units are distinct from Mercruiser or Volvo Penta drives.
Here is a write-up regarding the TMP gearbox top housing based on common service manual procedures for this unit.
Instead of just saying "replace if worn," the Top manual gives you:
Standard manuals say "tap seal in until flush." The Top manual specifies a 3mm recess depth for the viton double-lip seal. It also mandates the use of Loctite 518 on the seal housing—a step 90% of mechanics skip, leading to premature leaks.
The "TMP gearbox workshop manual top" refers to the technical procedures required to service the upper drive shaft housing. If you are attempting a DIY repair, the most critical resource you need is the Torque Specifications Sheet and the Shim Selection Chart specific to the model year of your Toyota Marine drive.
Could you clarify what you mean? Here are a few possibilities:
If you can provide a bit more detail — like:
…I can give you a custom-written workshop manual excerpt (e.g., safety precautions, disassembly steps, torque specs, or top cover removal).
For now, here’s a generic, professionally styled excerpt for a “TMP gearbox workshop manual — top section”:
TMP Gearbox Workshop Manual
Section 1: Top Cover & Shift Mechanism
1.0 General Information
The TMP gearbox is a constant-mesh, 3-shaft design. The top cover houses the shift forks, detent springs, and selector rods.
1.1 Safety Precautions
1.2 Top Cover Removal
1.3 Disassembly of Top Cover
1.4 Torque Specifications
1.5 Common Faults
For information regarding a TMP (Thamesway Marine Products) gearbox workshop manual and general maintenance, please find the technical overview below based on current community knowledge and available service documentation. TMP Gearbox Technical Overview & Maintenance
The TMP hydraulic gearbox is a robust, high-pressure epicyclic unit frequently paired with marine engines like the Perkins 4.107 and 4.108. It is known for its high operating pressure—typically around 80 psi—which makes it effective but also prone to oil leaks if seals degrade.
Official Manuals & Spares: While formal digital manuals can be elusive, Thamesway Marine Products still carries spares and provides technical advice for DIY repairs.
Oil Requirements: Most TMP units use standard engine oil (SAE 20 or similar). It is critical not to overfill the gearbox; even a small amount over the "full" mark on the dipstick can blow the front oil seal. Key Service Points: Oil Filter: Located on top of the main gearbox.
Pressure Gauge: Fluctuations in the gauge often indicate a low oil level.
Cooling Water Connectors: These are susceptible to corrosion; check them regularly for leaks or blockage. Common Troubleshooting
Before diving into the specifics of the manual, it is crucial to understand the complexity of the TMP gearbox itself. Unlike generic transmission units, TMP gearboxes often feature:
A standard Haynes or Chilton manual will not suffice. You need the TMP Gearbox Workshop Manual Top because it contains model-specific tolerances, hydraulic pressure charts, and exploded views that generic guides omit.
A TMP gearbox is a precision instrument—a symphony of hardened steel, hydraulic pressure, and carefully calculated tolerances. To treat its maintenance as guesswork is to invite downtime, parts damage, and safety hazards. tmp gearbox workshop manual top
The TMP Gearbox Workshop Manual Top is not merely a book of instructions; it is the accumulated knowledge of TMP’s engineering team, field testers, and warranty specialists. From the correct angle to sharpen a synchronizer ring to the exact pressure drop across a clogged filter, this manual holds the answers.
Whether you are an independent shop owner, a fleet maintenance manager, or a serious off-road enthusiast, investing in the Top edition is a decision that pays for itself on the very first rebuild. Don’t rely on torn pages, faded memory, or generic YouTube tutorials. Get the TMP Gearbox Workshop Manual Top, and keep your transmissions running at peak performance for thousands of hours to come.
Call to Action: Visit the official TMP documentation portal today. Verify your gearbox model and serial number, and order the Top manual that matches your specific unit. Your gearbox—and your bottom line—will thank you.
Disclaimer: "TMP" is a placeholder for illustrative purposes. Always consult the genuine manufacturer documentation for your specific equipment. Specifications and tool numbers in this article are representative examples and should not be used for actual repairs.
TMP Gearbox Workshop Manual Top
The TMP Gearbox Workshop Manual Top is a detailed guide designed for technicians, mechanics, and DIY enthusiasts working with TMP gearboxes. This manual provides in-depth information and instructions for the proper maintenance, diagnosis, and repair of TMP gearboxes.
Key Features:
Benefits:
Target Audience:
Format and Availability:
The TMP Gearbox Workshop Manual Top is available in various formats, including:
By covering the TMP Gearbox Workshop Manual Top, this feature aims to provide a thorough understanding of the manual's contents, benefits, and target audience, ultimately helping users to efficiently maintain and repair TMP gearboxes.
TMP Type 12000 marine gearbox is a high-pressure hydraulic unit originally manufactured by Thamesway Marine Products (TMP)
. Known for its epicyclic design (planet and sun gears), it is commonly found on vintage marine engines like the Perkins 4.108.
Official workshop manuals and specialized repair advice are still maintained by the successor company, Thamesway Marine Products
, which offers spare parts, D.I.Y. repair guides, and reconditioning services. Thamesway Marine Products Key Maintenance & Service Specifications Oil Requirements : Uses standard SAE 30 engine oil Operating Pressure : The system typically operates at approximately to hold the conical clutch plates together. Oil Filter
: Located on top of the main box; these are generally standard automotive-style filters available from most motor factors. Level Check
: Check via the dipstick integrated into the filler plug on top of the gearbox. Be precise, as the volume between "fill" and "full" is very small. 동이공업 Service & Repair Guidance
For detailed D.I.Y. operations, the following procedures are highlighted in community and manufacturer documentation: TMP gearbox assembly DIY | YBW Forum
In the world of classic marine engineering, few things evoke the "grease and grit" era of British boating like the TMP (Thamesway Marine Products) hydraulic gearbox. Far from a simple set of gears, these units—often the TMP Type 12000—are legendary for their heavy-duty build and their specific mechanical quirks that keep DIY enthusiasts busy every winter.
Here is a look at what makes these gearboxes and their workshop manuals so fascinating: 1. The "Heavy Bit of Kit"
The TMP gearbox is a high-pressure hydraulic unit, often compared to the old overdrive units found in vintage cars like MGs and Triumphs. It is famously heavy and requires serious patience to maintain. In fact, seasoned boaters often warn that DIY repairs are "not for the faint-hearted" due to the precision required to handle its internal conical clutch plates. 2. The Rust Battle & the "2-Inch Hole" Solution
One of the most interesting "hacks" documented by Thamesway Marine Products involves removing the gearbox from a Perkins or Mercedes engine. If rust has seized the drive bushes into the flywheel, the entire housing will simply "bounce" when you try to pull it off. The official DIY advice? Cut a 2.0-inch square access hole directly into the housing so you can get a lever in to pry the bushes loose. 3. The Mystery of the Oil Level
Monitoring a TMP gearbox is more art than science for many owners:
The Dipstick Trap: The difference between "Fill" and "Full" is tiny. Overfilling can lead to leaks because the unit runs at high hydraulic pressure (roughly 80 psi).
Gauge Twitching: If you see your hydraulic pressure gauge flickering, it’s not just a ghost in the machine—it’s the classic sign of a low oil level. 4. Direct vs. Reduction: The Spin Game
The manual reveals a curious mechanical geometry. Depending on the specific reduction box attached, your propeller might spin in a different direction than your engine: Direct Drive: Propeller spins the same way as the engine. 2-Pinion Reduction: Propeller spins the opposite way.
3-Pinion Reduction: Propeller returns to spinning with the engine. 5. A Living Legacy
Despite being "quirky old things," TMP gearboxes are still supported by Thamesway Marine Products in the UK, which continues to provide spares and advice for those determined to keep these maritime workhorses running rather than swapping them for modern, lighter ZF Hurth or PRM units.
Are you planning a full rebuild or just looking for specific torque specifications for a repair? diy.htm - Thamesway Marine Products TMP Type 12000 Marine Gearbox , manufactured by
TMP Type 12000 marine gearbox, manufactured by Thamesway Marine Products (TMP)
, 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
For a TMP Type 12000 marine gearbox, the "top piece" typically refers to the hydraulic control block or the selector valve assembly, which contains the operating lever and oil filter. Key Maintenance & Parts
Oil Filter: Located on top of the main gearbox. It is a standard cartridge that should be replaced during regular service.
Control Lever: Mounted to the valve block on top. It follows a "sense" operation: forward for forward, backward for backward.
Filler/Dipstick: Usually found on the top near the oil filter to measure engine oil levels (SAE 20 or 30). Workshop & Assembly Tips If you are dismantling the top section or the entire unit:
Removal: The gearbox and bell-housing must often be removed as a single unit.
Tools: A 7/8" A/F socket (1/2" drive) with a maximum outside diameter of 1.812" is required for internal nuts.
Seals & Gaskets: Always replace the gasket and O-ring kit (Part TM 12470) when opening the top or main casing to prevent high-pressure leaks.
Pressure: The system operates at approximately 95 to 100 psi. Flicking pressure gauges often indicate low oil levels.
For detailed diagrams and current parts availability, you can check Thamesway Marine Products, who still support these historic units.
Are you trying to fix a leak or a shifting issue?I can provide more specific steps if you tell me: The exact model (e.g., MK II or MK IV) If you're seeing oil leaks around the top selector If the pressure gauge is giving unusual readings TMP gearbox assembly DIY | YBW Forum
The TMP Type 12000 Marine Gearbox workshop manual is primarily available through Thamesway Marine Products (TMP), the official manufacturer and service provider for these units since 1982. Accessing the Manual & DIY Resources
Direct Purchase: You can order a physical copy of the Workshop Manual directly from the Thamesway Marine Products DIY page. This manual provides detailed assembly and repair instructions.
Online Maintenance Guides: The manufacturer provides specific technical notes on their website covering:
D.I.Y. Repairs: Includes hints for re-assembly, lists of required oil seals (e.g., TM 12090), and wear inspection areas for clutch linings and planet gear bushes.
Gearbox Rotation: Essential for identifying if your unit is right-hand or left-hand rotation and selecting the correct oil pump.
Specifications: Details for Direct Drive, 2:1, and 3:1 reduction types, including max torque (100 lbs ft) and RPM (4000). Service & Location Details
Thamesway Marine Products is located in Norfolk and offers full recon services and spare parts for models previously produced by brands like Henry Meadows, Nicor Marine, and Bybrook Engineering.
Location: Pits Lane, Chedgrave, Norfolk, NR14 6NQ, United Kingdom.
Key Maintenance Note: Use only SAE #30 engine oil; multi-grade oils can cause clutch slippage. Chapter 5: External Components & Sealing
Pressure Monitoring: The hydraulic system should operate at approximately 80 psi.
If you are looking for a Top Drive manual for oil rig equipment (often also abbreviated as TMP), there are digital copies of the Varco TDS-11SA Top Drive System manuals available on platforms like Scribd.
To help you get the exact data you need, are you looking for marine engine gearbox specs or industrial/drilling top drive information? diy.htm - Thamesway Marine Products
For those maintaining or rebuilding a TMP (Thamesway Marine Products) Type 12000 Marine Gearbox
, having the right manual is essential, as these hydraulic units are often described as "not for the faint-hearted". Essential Workshop Manual Details The official TMP Workshop Manual
includes critical assembly diagrams, part numbers, and maintenance specs. Key takeaways for your next service include: Oil Requirements SAE #30 engine oil
. Multi-grade oils (like 15W40) should be avoided as they can negatively impact the friction coefficient, causing the clutch to slip. Operating Pressure : The hydraulic system should typically operate at around to hold the conical clutch plates together. Routine Maintenance
: Replace the oil filter regularly; they are readily available from standard motor factors. Check oil levels daily, as the dipstick range between "fill" and "full" is very small. Key Service Components When performing a rebuild, ensure you have the following Thamesway Marine Products spare parts on hand: TMP gearbox - YBW Forum 21 June 2012 —
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 —
Maintaining a marine transmission like the TMP (Thamesway Marine Products) Type 12000 series requires technical precision and a deep understanding of its unique hydraulic and mechanical architecture. These gearboxes, originally produced by manufacturers like Thames Marine Propulsion and Henry Meadows, are heavy-duty units that demand specific procedures for overhaul and service. Essential Technical Specifications
Before beginning any workshop repairs, confirm the specific model from the serial plate located on top of the gearbox.
Lubrication: Use only SAE #30 engine oil. Avoid multi-grade oils (e.g., 10W40), as they can negatively impact the coefficient of friction and cause clutch slippage.
Operating Pressure: The system typically operates at approximately 80 psi to engage the conical clutch plates.
Rotation: Most TMP 12000 units are designed for right-hand rotation engines. Note that direct-drive models turn the propeller in the same direction as the engine, while reduction boxes may vary based on the number of pinions used. Critical Maintenance and Assembly Components
A full overhaul requires specific replacement parts to ensure the integrity of the hydraulic seals and mechanical drive. Component Type Part Number / Requirement Input Seal Prevents oil leaks at the bell housing interface. Output Seal Seals the output shaft for direct drive units. Gasket Kit Includes essential O-rings for pressure integrity. Brake Pad Neutral brake pad for stopping shaft rotation. Oil Filter TM 12009 / 12773 Models differ between MK II and MK IV versions. Step-by-Step Workshop Procedures 1. Removal and Disengagement
The gearbox is typically attached to the engine bell housing by internal nuts. You must remove the gearbox and bell housing as a single unit.
Engine Support: Since the bell housing often carries the rear engine mounts, ensure the engine is properly supported before unbolting.
Disengagement: A rearward movement of approximately 2.0 inches is usually required to clear the input shaft. For Mercedes-based installations, this may increase to 6.0 inches.
Frozen Bushes: If the 8-bush input is seized due to rust, experts at Thamesway Marine Products suggest cutting a small access hole in the housing to apply lubricant and leverage the flywheel directly. 2. Inspection for Wear
During disassembly, pay close attention to the following high-wear areas:
Clutch Linings: Ahead linings often show "gramophone groove" witness marks. Modern replacement linings require professional bonding.
Oil Pump: Check the pressure plate face and gears for ovality. Excessive wear here leads to a "flicking" pressure gauge or total loss of drive.
Planet Gears: Inspect the bushes and shafts. Wear in this area is a primary cause of excessive noise. 3. Reassembly Best Practices TMP gearbox assembly DIY | YBW Forum