The basic assembly of all Deltic engines is the main triangle comprising three cylinder blocks and three crankcases "tied" together by a system of high tensile steel bolts which pass through the cylinder blocks and crankcases.
CRANKCASE AND MAIN
Each crankcase is a one-piece aluminum alloy casting, substantially webbed and carrying a crankshaft in thin-walled lead-bronze, lead plated, indium-infused main bearings.
Each bearing cap is secured by four studs, and additionally located by a tie-bolt which passes transversely through the cap and the crankcase walls on either side.
The crankshafts have hollow crankpins, are nitrided all over and the bearing surfaces are finished by lapping. Each crankshaft is statically balanced and fitted with a viscous-type torsional vibration damper. The top crankshafts are identical and rotate in a clockwise direction; the bottom crankshaft has opposite-handed throws and rotates in an counter-clockwise direction to obtain the correct phase relationship.
The three separate cylinder blocks are identical light allow castings of monoblock construction with integrally-cast coolant passages, exhaust ports, and air inlet manifolds.
CYLINDER BLOCK LINER
Each liner is located longitudinally by a ring nut which clamps a flange on one end of the liner against a shoulder in the bore of the cylinder block. The liners are located radially by the injection nozzle adapters which are screwed through the cylinder block into the wall of the liner.
Each piston consists of two separate parts, an outer piston body of cast aluminum which has an unbroken skirt and carries the two top compression rings in an austenitic iron insert bonded to the aluminum by the 'Alfin" process, and an inner member which is machined from a 'Y' alloy forging; the latter carrying a fully-floating, hardened-steel gudgeon pin.
CONNECTING RODS AND BEARINGS
Each crankpin carries a pair of connecting rods, one plain and one forked, on thin-wall, lead-bronze, lead-plated, indium-infused bearings.
The injection pump camshafts are enclosed by light allow casings assembled to the outer face of the cylinder block. The camshafts are carried in phosphor-bronze bearings lined with white metal, and are driven through short quill-shafts which incorporate simple vernier timing adjustments.
Power is transmitted from each crankshaft through coupling quill shafts to phasing gears which combine the three outputs into a single shaft, the direction of rotation of which is determined by the arrangement of the idler gears.