I have the 3gm30 and am getting black sooty smoke after 2400 rpm. new exaust elbow, filters, replaced injectors. adjusted the valves and still the same.
Compression test #1-500psi #2-400 and #3 is 410. was told that a new 3gm30 wont get over 460psi so either its something else or the gague is wrong. So if the gague is off it's about 8% off so that brings down my loest psi to the 360 ish range and I see a problem..
Question? Time for a rebuild? if so who? or can this be done with a book and a rebuild kit, or should I upbrade to the yanmar replacement what ever that is. Many thanks for the help