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model R exhaust slobbering

W

WORNOUT

Member
new overhaul on engine new thermostat ,rings ,head checked ok by machine shop.. engine dyno tested develops full HP at proper RPM. when engine idles for 10 or 15 minutes exhaust starts slobbering real bad and miss firing, injectors and pumps checked and ok sometimes has white smoke when starting?? any ideas what should compression test Thanks
 
Put it to work for a couple hours, don't be afraid to make it smoke, just don't overheat it or lug it down too much.
Ben
 
Hook something behind it and take it to the field and put it to work. Rings will never seat just putting around the yard.
 
It's "wet stacking".

WHY are you leaving it idle for 10-15 minutes?

WORK it/WARM it up or shut it down after a few minutes.
 
First, put it to work as been said, and then if the wet stacking returns I'd bet the head needs all valve seats installed. Too many machine shops don't understand on diesel heads the valves MUST NOT be recessed as that lowers starting compression heat on diesels. You should have 350-400 PSI compression pressure, higher is better. While diesels will run at 300, they won't start well when that low. Just grinding the valves and seats slightly can get the valves below new spec enough to cause the trouble you describe. Not a problem on gas heads as the compression in much lower, but dropping the valves just .040 inch can make a HUGE difference on diesel compression.
 
My Perkins diesel used to just slog around and lope around and idle around, and slobber bad until I read the owner's manual where it said warm it up at 1200 RPM for 3 minutes, then operate at 1700 rpm. Problem solved.
 
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