钻石40飞机维护手册 DA 40 SERIES AMM 5(46)

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B. Crankshaft
The I0-360-M1A engine has a hollow crankshaft with four main bearings. The crankshaft has four big-end bearings for the connecting rods. The front of the crankshaft has a drive flange for the propeller and flywheel.
The drive flange has six bolt holes. The bolt holes have special bushes. The bushes have a screw thread on the inside for the propeller bolts. Four of the bushes are long and two of the bushes are shorter. One of the shorter bushes is marked with an “o”, this is the index bush.
C. Camshaft
The one-piece camshaft is mounted in the crankcase. The camshaft is driven by a gear on the rear of the crankshaft. Another gear at the front of the camshaft drives the propeller governor gear-train. The camshaft has eccentric lobes which operate the push-rods for the valve-operating-gear.
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Rev. 4 09 Jan 2003

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%  Crankcase 
%  Cylinder 3  Right Half 
%  Crankcase 
%  Left Half 
Cylinder 4 
Cylinder 1 
Rocker Cover 
Flywheel 
Fuel Injector  Oil Sump  Cylinder 2 
Figure 1: Engine Assembly 

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Engine
AMM

D. Connecting Rods
The engine has the usual connecting rods. The “big-end” of the connecting rod attaches to the crankshaft journal and the “small-end” attaches to the piston.
Each rod has a split big-end bearing and it has a bearing cap. Two special bolts attach the bearing-cap to the connecting rod. The small-end has a plain bearing which is a sliding fit with the piston gudgeon-pin.
E. Flywheel
The flywheel attaches to the front of the crankshaft. The drive bushes hold the flywheel in place and a central spigot on the drive flange aligns the flywheel.
The flywheel has two Vee grooves machined in it. One Vee groove on the rear of flywheel moves a flexible belt for the generator.
The outside of the flywheel has the starter-ring -gear attached. A pinion gear on the electric starter turns the flywheel with the starter-ring-gear when the starter is operated.
F. Cylinder Assembly
The engine has four individual cylinders. The head of the cylinder is aluminum alloy and the barrel of the cylinder is steel. The cylinder heads is screwed onto the cylinder during production and cannot be removed.
The base of the cylinder has a flange which is used to attach the cylinder to the crankcase. A spigot below the flange aligns the cylinder in the crankcase. Studs, nuts and washers attach the cylinder to the crankcase. An O-ring seal makes an oil-tight seal between the base of the cylinder and the crankcase.
The intake and exhaust flanges are machined into the lower side of the cylinder head. The cylinder head has an upper and a lower hole for the spark plugs. The outboard end of the cylinder head has the intake and exhaust valves. It also has a housing for the valve operating gear.
The valve housing (rocker box) is closed with a cover plate. The cover plate attaches to the cylinder head with six screws and a cork gasket makes an oil-tight seal.
Doc # 6.02.01 Page 3
Rev. 4 09 Jan 2003

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AMM

G. Accessory Housing
The rear accessory housing attaches to the rear of the crankcase. The rear part of the crankcase holds the gears which turn the accessories. The crankshaft has a gear on the rear end.
The crankshaft gear turns two idler gears. The left idler gear turns the camshaft gear and it turns a gear which attaches to the left magneto. The right idler gear turns the right magneto.
The accessory housing closes the rear of the crankcase. Bolts attach the accessory housing to the crankcase. The accessory housing has mounting pads for the magnetos.
The accessory housing holds the engine lubricating oil pump. The oil pump, is on the inside of the housing and an internal oil gallery connects the inlet of the oil pump to the sump. A shaft from the rear of the crankshaft turns the oil pump.
　
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