Can noisy silent shaft chain be repaired without pulling the engine?

[LSR Mike]

Mitsubishi P/N 191430 Gasket, Timing Chain Case, Hole Cover

[Kerrigan]

Thank you Mike!

Mitsubishi P/N 191430 Gasket, Timing Chain Case, Hole Cover

[Kerrigan]

Called Mitsubishi dealer part and they said "not a valid part number" and their on-line doesn't go back to 1980.

Is this like a Dodge number?

Mitsubishi P/N 191430 Gasket, Timing Chain Case, Hole Cover