Posted by pete 23 on January 21, 2015 at 21:35:54 from (173.87.12.65):
In Reply to: I.H. 606 problem posted by Injectorod on January 21, 2015 at 20:30:56:
I would check two things, maybe three. First off, static timing. It should be 3 degrees BTDC. If that checks ok and it runs good at full throttle, no sputter I would go to third check and that is valve clearance of .027 all around. If the static timing is earlier than 3, I would retard it to correct and then put a window on and check the automatic load advance. A whole lot of guys, have a sputtering engine at high speeds, no load and they advance the timing to get rid of it when in reality they need to look at the load advance. That engine should have zero advance while cranking and as soon as the engine starts it should advance two marks on window. It needs to be set under load on a dynamometer so it maintains full advance at all no load speeds but retards one mark at half load and retards two marks at full load. I have set many over the years by just making sure the retard some while accelerating from low idle to full throttle. That for sure is not the best way but it will get you by. I also have seen an engine where the valves were protruding a little too much and touching the pistons. I didn't notice a knock though. Most of the time the valves are recessed too much but some machine shops push the height in head a little too much.
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