Vedeneyev M-14P, Maintenance Manual

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Three holes provided in the conical wall of the front cover are intended to breath internal spaces of the
crankcase and a hole for draining oil from the gearbox housing to the intermediate crankcase.
2.2. INTERMEDIATE CRANKSHAFT
The engine intermediate crankcase is adapted to accommodate the parts of the crank mechanism, timing
mechanism and to mount the cylinders.
The intermediate crankcase (Ref. Fig. 2) also referred to as crankcase main section comprises two
sections: front and rear, stamped of aluminium alloy and machined jointly.
The crankcase joint is in the cylinder center line plane. Both sections of the intermediate crankcase are
interconnected and mutually aligned by nine coupling bolts extending through the holes in bridges between the
cylinder mounting flanges.
Eight coupling bolts are interchangeable. The nineth bolt installed in the crankcaae lower hole has a
different head, smaller thickness between the aligning collars and greater length than the other bolts.
Nine flanges with eight studs each are uniformly spaced around the crankcase. The studs are intended to
attach the cylinders.
The intermediate crankcase has a front flange with studs for mounting the front cover and the gearbox
housing and a rear flange with studs for attachment of the mixture collector and two lower flanges with two studs
each for mounting the oil sump.
Provided in the lower part of the intermediate crankcase are holes for installing the oil baffle. The baffle
decreases bubbling of oil carried by the crankshaft counterweights and decreases drain of oil to the oil sump.
The front portion of the intermediate crankcase (Ref. Pig. 3) has an annular projection with a machined
flange. Located on the outer side of the projection are eighteen flanges with holes for installing tappet guide
bushings.
Drilled in the holes for the guide bushings of the inlet valve tappets of cylinders Nos 1, 2, 8 and 9 and
exhaust valves of cylinders Nos 1, 2, 3» 8 and 9 are passages to supply oil to the tappets and slots for draining oil.
The stepped oil passage connects the main gallery with a hole on the flange of the front cover.
The central hole in the vertical part of intermediate crankcase front portion ia intended for pressing in the
bronze holder of the front roller bearing of the crankshaft. The holder is secured by three retainers pressed into the
central boss of the front portion of the intermediate crankcase.