I made my own wrenches by heating and bending. You could probably
get by with two short 14mm wrenches though. I don't know how long it had been since the po adjusted the valves. All but three were very tight.
The job is kind of fiddley but not hard. Be sure to take a picture of how
all the linkage goes back on.

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85 300TD FED-Daily
84 300SD-Wife's
86 XJS-Sunday
66 GMC-Work- Given to my stepson
83 BMW Airhead- Given to my stepson