The chain guide rail next to the tensioner comes off by removing those pins....
You will have to make a puller using a bolt, sockets and washers to remove the little pins....
If I remember right the lower one is accessed through a groove in the balancer assy...
I can check my engines location of those if you get stuck....

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1978 Yellow 300D (The Mustard Toad)
1980 Blue 240D (The Iron Toad)
1989 Grey Mitsu.4WD Mighty Max Pickup (Needs a Diesel transplant bad)

(Open the pod bay doors HAL)