Is it easy to replace both the fuel shut off lever and the hydraulic head O-rings with the injection pump in place? What obvious precautions should be taken? Is it better to remove the pump from the engine? I saw a video on U tube for replacing the shut off lever O-ring, but did not find one for replacing the hydraulic head O-rings. When you pull off the hydraulic head, do any small parts fall out unexpectedly? If I do this with the pump in place (preferred option) I would definitely use plenty of towels or rags everywhere under the pump to keep small parts from falling through.
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