Yep 14mm is the right size. Dieselgiant makes a kit that comes with wrenches that I think he made himself and a new gasket for $64 total with s/h. This is what I was going to buy but the straight wrenches wound up doing a good job. Here's the link.

http://dieselgiant.com/diesel_parts_for_sale.htm#Valve%20Adjusting%20Wrench%20Kit

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Seth

1984 300D 225K
1985 300D Donor body
1985 300D Turbo 165K. Totaled. Donor Engine. It runs!!!
1980 300SD 311K My New Baby.
1979 BMW 633csi 62K+++? Dead odo