The cylinder head seals the top of the combustion chamber and houses the valve train that controls gas exchange. This group covers complete heads and bare castings, inlet and exhaust valves, valve guides and seats, valve springs, collets and caps, stem seals, rocker arms and shafts, pushrods, tappets and the camshaft. Heads are exposed to high thermal and mechanical loading, so cracking between valve seats, warped sealing faces and recessed valve seats are common findings at overhaul. Valve clearances need periodic adjustment: excessive clearance causes noise and accelerated wear, while insufficient clearance can hold a valve off its seat and burn it.
AMS Parts supplies a wide range of cylinder head & valves components for MWM engines used in power generation, marine, and industrial applications. Browse the full range below, or contact us for specific requirements.
Browse our range of Cylinder Head & Valves parts below. Use the search bar above to find a specific part number, or request a quote.
Overheating, coolant loss and thermal cycling are the main causes. Cracks typically appear in the bridge between valve seats or around injector bores, where thermal stress concentrates.
Follow the manufacturer's service schedule for the engine and duty cycle. Clearances should also be checked after any cylinder head work or valve train disturbance.
A head can usually be skimmed if distortion is within limits and the casting is crack-free. Removing material affects compression ratio and valve protrusion, so check the manufacturer's minimum thickness.
