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The pump is adjusted by shims if it is anything like the 2GM.
It is actuated by a camshaft and the shims vary the injection timing by moving the pump body, and hence the follower closer to, or farther away, from the cam.
This thread shows one reason why the Yanmar service manual is worth the money.
Last edited by Goodnewsboy; 01-05-2007 at 07:18 PM.