Hanomag Sd.Kfz. 251 engine and engine compartment

Maybach Maybach 12 cyl mascot
Maybach is more than a name. He was one of the pioneers of the industry. He worked with and for many of the great names before he founded his own company that won graet fame building light enough engines to fly the great Zeppelin airships. Almost all tanks and many other heavier tractor like the halftrack range was propelled by Maybach engines. His name got revived in the extremely luxourious line of cars that Mercedes-Benz markets sins the late 90-s. The mascot on the right was introduced in 1930 on introduction of the 12 cylinder of the Maybach Zeppelin, a fabulously luxourius car.


In 1938 production starts with the 6 cylinder Maybach NL 38 TUKR. From 1940 on that is the HL 42 TUKRM
This means:
HL = Hochleistung (top achievement)
NL = Normalleistung (normal achievement)
TU = Tiefes Unterteil (Low bottom part)
K = Kupplungsgehäuse (Clutch housing)
T = Trockensumpf
M = Schnapper Magnetzünder
38 = 3817 ccm = 3.8 liter
42 = 4199 ccm = 4.2 liter


Maybach HL 42 TUKRM engine left Maybach HL 42 TUKRM engine right
2 views of the HL 42 TUKRM from the manual.


Maybach engine cut-through
Factory cut through illustration


Specifications Maybach HL 42 TUKRM

 6-cylinder, gasoline, cast iron
Displacement:4199 cc = 4.2 liter
Bore/Stroke:90 x 100
Output:100 Hp at 2800 rpm
Compression ratio:1:6,6
Valves:Overhead, 2 per cylinder, hanging
Valveshafed:Single, on top with 8 mounts
Cooling:Water, with pump, dual ventilator and thermostat. 26 liter
Carburetor:1 Solex 40 JFF II carburetor (with 4 floats)
Fuel pump:Bosch EJD 1.8/12
Ignition firing:1-5-3-6-2-4
Starter engine:Bosch RKCN 300/12-1300 (300 watt, 12 volt)
Battery:1 or 2 75 Ah batteries. (Radio and special vehicles receive 2. The gasoline-tank is adjusted for the second)
Air filter:In desert operation the air-filter and airflow are changed

Engine compartment

Engine compartment
Peaking through above the left front wheel (some armor missing) a derelict survivor at an exhibition in Bastogne reveals a part of the engine.


Engine compartment
Standing on top of the same survivor looking down (and to the back) a part of the "firewall" is visible.


Engine compartment Engine compartment
Left the Dutch survivor (now in the museum in Best) photographed by Werner Stubner in the time that it was in store at the Armamentarium in Delft. Dual fans on the radiator. Right the same place as pictured in the manual


Engine compartment
The "firewall" seen from the right front. The chassis was used for instruction on mechanical construction by the Dutch army.


Engine compartment Engine compartment
Left the stripped firewal from the "Best" surviver in it's Delft days. Right the left part of the same spot from the manual.


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