Posted by The tractor vet on June 07, 2011 at 13:18:43 from (76.212.230.69):
In Reply to: SMD compression posted by Dan MD on June 07, 2011 at 07:34:34:
I would lay a dollar to a do nut that your miss is going to be something you do not want to find . If the miss is on the diesel side it will be either a cracked head of you have a crack in either 2 or 3 in the cylinder wall as this is where i have found most of the problems relating to misses on M D's thru 450 D's . If this is the case you can save your block by having it bored and a repair sleeve pressed in and rebored to take the standard sleeve . myself i love them old gas start diesels BUT HATE the cost of fixen them . They will run forever IF people would just learn not to shut them down HOT or stall them in the field and not be able to restart wright away . If ya want one to live ya warm them up slowly and when your done working them ya let them set and idle till the temp gauge is in the cold and shut them down ON DIESEL side not the gas side as the gas makes them hot again . Now it is possible that your miss could also come from the bushing in the injection pump being egg shaped as was the case with my 450 D as i learned a lot on that tractor many years ago . Back then i did not know much about repairing farm tractors and i bought this old tractor as is where is and it missed back fired and yes a diesel can back fire . BUt when ya put it under a load it ran fine when the load came off it started missing , Had a reg. I H mechanic come out one Saturday after noon and check it out and first words out of his mouth was cracked head . Back then a NEW bare head was 650 bucks from I H . My buddy and i tore into it and removed the head and set it off to be checked out and a valve job done . Well the head was GOOD and we put it back together and yep still missed . Next we swapped injectors from his 450 to mine and it still missed . Then we got brave and switched pumps now mine ran great and his missed , now we know it was the pump so off the pump went to be repaired . First guy wanted 650 bucks to rebuild as he told me that it needed this and that . Took it to the I H industrial dealer and he fixed it for 112.78 and made shell we say some IMPROVEMENTS to it like TD9 governor weights and spring cranked up the RPMs as far as he could installed a TD 14 plunger and showed me how to turn up or down the fuel for farming or pulling how to set the timing . From that day on that tractor never saw a stock pump setting and that was back in 69 . that 450 is still in my area and i have tried several times to get it back even tried to swap him out of it with a 706 D even up , all i get from the guy is Ain't noway as he clams it is the best tractor he has ever owned . And the only repairs done to it has been a injection pump rebuild For the same problem .So Check that out before taking the engine down first. Best place for getting that pump done is Progressive Diesel In New Castle Pa.
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