BENDIX SD-01-3131 User Manual

are part of the valve plate assembly. The inlet reed valve/

gasket is installed between the valve plate assembly and 

the top of the crankcase. 

The cast iron crankcase has a water jacket to assist in the 

cooling of the cylinder bore. The crankcase has an open 

side with a machined face and locating pins. This open face 

is bolted directly to the side of the engine block.  Refer to 

The compressor gear engages the engine drive gear. 

In addition, the crankcase houses the piston assembly, 

connecting rod, crankshaft and related bearings. O-rings 

are located in the countersunk holes (one each side) on 

the crankcase deck to prevent coolant leakage between 

the crankcase and valve plate coolant passage.

The Bendix

®

 720cc compressor is equipped with a safety 

valve to protect the compressor head in the event of, for 

example, a discharge line blockage downstream of the 

compressor. Excessive air pressure will cause the safety 

valve to unseat, release air pressure, and give an audible 

alert to the operator. The safety valve is installed in the 

cylinder head safety valve port, directly connected to the 

cylinder head discharge port.

A nameplate is attached to a flat cast face on the side of 

the crankcase. It is stamped with information identifying the 

compressor model, customer piece number, compressor 

assembly part number and serial number. See Figure 2.

Compressor to 

engine block 

mounting face

Oil drain locations

Safety 

Valve

Cooling 

Plate

Valve Plate 

Assembly

Cylinder 

Head

Crankcase

Drive Gear

Nameplate

Piston

Crankshaft

Mounting 

Face

Connecting 

Rod