M201, Willys MB and Ford GPW Differences
Page 3
Handbrake
Drum
The handbrake on the M201 operated like a normal drum brake with the brake shoes on the inside of the drum. Willys and Ford Jeeps had an external contracting band brake, 'though late war Jeeps had internal shoes like the M201. |
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Batteries
The MB and GPW started life on 6 volts, although late in the war, I believe there were some 12 volt Jeeps. The early M201's were also 6 volt, but evolved to 12 volts. From 1960 onwards, M201's were upgraded to 24 volts, the NATO standard. This was achieved by fitting a second battery behind the first, displacing the voltage regulator from the fender to the firewall. This then forced the air filter to be moved to the left side of the engine bay. |
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Willys and Ford Jeeps may have had this conversion if they were used by the French Army after World War 2. | |||
Air
Filter
As a result of the second battery, the M201's air filter was moved to the left side of the vehicle. On the MB and GPW, it was mounted on the right side of the firewall, next to the fuel filter. |
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Voltage
Regulator
With the fitting of a second battery to the M201, voltage regulator was moved from behind the battery to the firewall, next to the fuel filter. It is also a different style case to the MB and GPW version. On the MB and GPW, the regulator was fastened to the right fender. |
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Dynamo/Alternator
The M201 had a large powerful alternator fitted. The MB and GPW had a much smaller dynamo, but late in the war, there was a 12 volt alternator conversion fitted, as seen on the GPW. |
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Water
Pump
On the M201, the water pump had an extra pulley and drive belt fitted compared to the MB and GPW. |
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Distributor
The distributor, coil and ignition leads on the M201 was completely sealed and watertight, using positive pressure from the air filter intake. The MB and GPW had a standard distributor and points, with a separate coil mounted on the block behind the distributor. |
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Spark
Plugs and Leads
The M201 plugs were also sealed and shielded to work with the watertight distributor. The MB and GPW Jeeps used standard rubber insulated push on leads. These should be fitted with a 'witches hat' insulator, but they are often removed as they can lead to shorting. |
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Horn
The Willys and Ford vehicles had various horn styles. An early design featured a long trumpet on the front. This was replaced with a flat round design. The M201 horn was similar to the flat type, but with a different slot pattern and converted to 24 volts where necessary. |
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Carburettor
The M201 uses a Solex Carburettor, but the MB and GPW use the Carter or Zenith carburettors. |
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