08/10/2009
The Messerschmitt KR200, a beloved icon of post-war German ingenuity, captivates with its bubble canopy and unique three-wheeled design. Beneath its distinctive exterior lies a surprisingly robust and characterful engine, the Sachs 200. For enthusiasts seeking to maintain, restore, or simply understand this fascinating piece of automotive history, delving into the engine's specifications and maintenance requirements is paramount. This article aims to demystify the Sachs 200 engine as found in the KR200, providing insights into its technical heart and the knowledge needed to keep it purring.
The Heart of the Matter: The Sachs 200 Engine
At the core of every Messerschmitt KR200 beats a single-cylinder, two-stroke engine manufactured by Sachs. Specifically, the Sachs 200 type AZL-R is the powerplant that gives these microcars their distinctive voice and mobility. This air-cooled engine, designed for simplicity and reliability, was a common choice for lightweight vehicles of its era.
Technical Specifications: A Closer Look
Understanding the engine's build is crucial for any maintenance or repair work. The Sachs 200 AZL-R boasts the following key specifications:
| Specification | Details |
|---|---|
| Engine Type | Single Cylinder, Two-Stroke |
| Model Designation | Sachs 200 type AZL-R |
| Bore | 65mm |
| Stroke | 58mm |
| Cylinder Volume (Displacement) | 191cc |
| Power Output | 9.7 hp at 5250 rpm |
| Transmission | Four-speed integrated gearbox |
| Clutch | Four-plate oil bath clutch |
| Cooling | Air-cooled |
The 191cc displacement, while modest by modern standards, was ample for the lightweight KR200, providing enough power to navigate city streets and country lanes with a charming, if not blistering, pace. The two-stroke nature means the engine mixes oil with fuel for lubrication, a characteristic that defines its operation and sound. The integrated gearbox simplifies the drivetrain, contributing to the overall compact and efficient design of the microcar. The four-plate oil bath clutch ensures smooth engagement and disengagement of power.
Overhaul Procedures: Bringing Your KR200 Back to Life
Restoring a Messerschmitt KR200, particularly its engine, is a rewarding endeavour. While a full workshop manual provides exhaustive detail, understanding the general overhaul procedures is a good starting point. These procedures, often found in dedicated manuals issued by Messerschmitt to their dealers and technicians, guide enthusiasts through the process of dismantling, inspecting, cleaning, and reassembling the engine.
Essential Spares for a Sachs 200 Overhaul
A successful engine overhaul hinges on having the correct spare parts. For the Sachs 200 KR-200, a comprehensive list of spares is crucial. While specific part numbers can be elusive, common items required for an engine rebuild typically include:
- Piston and Piston Rings: Essential for maintaining compression and sealing.
- Gaskets and Seals: Crucial for preventing oil and compression leaks.
- Bearings: For the crankshaft and gearbox.
- Ignition Components: Spark plug, points, condenser.
- Carburettor Parts: Jets, float needle, gaskets for the Amal or similar carburettor.
- Clutch Components: Friction plates, steel plates, springs.
- Small End and Big End Bearings: For the connecting rod.
- Crankshaft Seals: To prevent oil leaks.
- Air Filter Elements: To ensure clean air intake.
- Fuel Filter: To protect the carburettor.
Beyond standard consumables, specific tools are often necessary. These can include specialized pullers for the flywheel and gears, feeler gauges for precise gap settings, and Vernier calipers for accurate measurements. The availability of these spares and the knowledge of their correct installation are key to a successful engine restoration.
For those serious about their Messerschmitt KR200, a genuine workshop manual is an invaluable asset. These comprehensive documents, identical to those originally provided to official Messerschmitt dealerships and technicians, offer step-by-step instructions, detailed diagrams, and exploded views of every component. They are designed to assist both the home workshop mechanic and the professional technician in maintaining and repairing the Messerschmitt KR200 and its sibling, the KR201.
What to Expect in a Workshop Manual:
- Engine Overhaul: Detailed instructions for dismantling, rebuilding, and tuning the Sachs 200 engine.
- Transmission and Clutch: Guidance on servicing the integrated gearbox and oil bath clutch.
- Chassis and Suspension: Information on maintaining the unique three-wheeled chassis, steering, and suspension components.
- Braking System: Procedures for inspecting and servicing the braking system.
- Electrical System: Wiring diagrams and troubleshooting for the lighting and ignition systems.
- Bodywork and Trim: Advice on maintaining the distinctive bubble canopy and body panels.
- Torque Settings: Crucial data for ensuring fasteners are tightened correctly.
- Troubleshooting: Common problems and their solutions.
The inclusion of numerous diagrams is a significant advantage, visually clarifying complex procedures and component relationships. For instance, when dealing with the floor pan of a KR200 Cabrio, a workshop manual would illustrate how the original flat floor might be removed to accommodate custom modifications, potentially showing new mounting points for fabricated sides and floors.
Common Questions and Considerations
Q1: What is the primary lubrication method for the Sachs 200 engine?
A: The Sachs 200 is a two-stroke engine, meaning it requires a mixture of petrol and two-stroke oil to be added to the fuel tank for lubrication. The exact ratio should be followed as per the manufacturer's recommendations, typically around 1:25 or 1:50 depending on the oil used.
Q2: How can I identify if my KR200 engine needs an overhaul?
A: Signs of an engine needing an overhaul include a significant loss of power, excessive smoke from the exhaust, unusual noises (knocking or rattling), difficulty starting, or oil leaks. A drop in compression is also a key indicator.
Q3: Are parts for the Sachs 200 engine readily available?
A: While some common consumables like spark plugs are easy to find, specialized engine components for the Sachs 200 can be challenging to source. Many enthusiasts rely on specialist suppliers of vintage microcar parts, or sometimes on parts from other Sachs engine applications that can be adapted.
Q4: What is the significance of the oil bath clutch?
A: The oil bath clutch in the KR200's gearbox provides smooth engagement of power due to the lubricating oil between the clutch plates. Regular oil changes for the gearbox are essential to maintain its performance and longevity.
Q5: Can I use modern fuel in my Messerschmitt KR200?
A: Modern unleaded fuel can be used, but it's advisable to use a lead substitute additive or ensure the two-stroke oil you use contains appropriate additives to protect older engine components, especially valve seats if they were ever modified or if the engine design had any early variations. Always ensure the fuel/oil mixture is correct.
Maintaining the Magic: Keeping Your KR200 on the Road
The Messerschmitt KR200 is more than just a vehicle; it's a piece of history. The Sachs 200 engine, with its simple yet effective design, is the lifeblood of this iconic machine. By understanding its specifications, the importance of proper overhaul procedures, and the value of a good workshop manual, owners can ensure their KR200 continues to bring smiles to faces for years to come. Whether you're embarking on a full restoration or simply performing routine maintenance, a thorough knowledge of the engine is your most valuable tool.
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