I've tried to search for this detail with regard to vacuum pump diaphram installation but to no avail ('79 300D).

The diaphram kits come with a small o-ring, but this is not mentioned in the FSM. I've done the diaphram replacement twice in the past but always end up guessing which 'end' the o-ring goes on (last time I put it on 'first', before the large flat metal disk.

I thought this time I'd check with you all before I start.

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84 300D 255K "Mr B" ("Mr Becker")
79 300D 265K "Mrs B"
85 300TD 175K "Mali" (Sold)
74 Ford F-100 74K "Bonnie" (Sold)
67 Jeepster Commando (Sold)

Subscribed as I want to know too ! .

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-Nate
1982 240D 408,XXX miles
Ignorance is the mother of suspicion and fear is the father

I did then what I knew how to do ~ now that I know better I do better