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... VALVE OPERATION Twin overhead camshafts with directattack valve actuation, eliminating tappet adjustment. Cams contact largearea thimble tappets directly over end of valve stems, ensuring minimum wear. Camshafts driven by duplex chain with hydraulic tensioners to prolong chain life. LUBRICATION SYSTEM Full pressure system to all crankshaft, connecting rod and camshaft bearings. Large capacity, positive filtration system incorporated. CONNECTING RODS Steel beam section, with integral bolts, ensuring maximum stiffness with minimum reciprocating weight. PISTONS Special diecast aluminium alloy—diamond finished. Two compression, two scraper rings. Large diameter gudgeon pins, located by circlips. COOLING SYSTEM Thermostatic control. Closed circuit layout incorporates centrifugal water pump and large capacity tubular radiator with ample integral header tank. IGNITION High efficiency coil and distributor, with inbuilt automatic advance and retard. Distributor also has "octane" selector. CARBURATION Large twin variable jet S.U. carburettors. Auxiliary carburettor, electrically controlled from the dash for easy starting. FUEL SYSTEM Tank capacity 19 Imperial gallons. Twin electric fuel pumps. Inbuilt reserve, electrically operated. CLUTCH Large friction area single plate design, fully balanced. GEARBOX Of David Brown manufacture, ...
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