Cast iron chain case A90541, superseded after engine #4379 with A90607.
From engine outward, gasket against block A90383 seals the spacer A90547. Next A90546 cover gasket seals chain case assembly A90607.
The auxiliary drive inspection cover A90548 has a gasket with no known part number.
The chain case cover is secured by six SA506 hex bolts, four SA508 hex bolts, four SA528 hex bolts, four SZ902 round head slotted machine screw and appropriate lock washers.
These fasteners are dark Parkerized and typically a W or 30 head.
