Posted by pete 23 on December 16, 2009 at 11:03:07 from (173.87.0.174):
In Reply to: 4230 JOHN DEERE posted by TERRY PATTERSON on December 15, 2009 at 18:25:33:
The roosa master pump has limited excess fuel delivery at cranking speeds due to nature of design. In other words it is difficult to get a good cracking of the injection nozzles for good spray. Just like testing nozzles on the bench, if you pump tester slow you often have poor pattern but hit it hard with a lot of fuel and it really pops. On the in line pumps, there is a lot more fuel available at cranking speeds. Some pumps use a increased fuel device operated by engine oil pressue so it is deactivated so to speak once engine starts, or if you have to crank a long time to start. I am not sure if the 42 uses a lower comp ratio than the 44 or not. Piston height over block is critical along with valve protrusion and recession. Placement of top ring would also have some effect. I do know that a lot of Deere Mechanics used the M & W pistons when overhauling the 4020's for better starting. I personally never had the opportunity to measure them up to see if the height was greater or the bowl size was smaller. IH went to a smaller bowl size on the german diesel engines and made starting and cleanup much improved. Most service manuals are very poor on giving the piston protrusion over block specs. A engine rebuild shop does have access to this information along with the length of connecting rod center to center dimension which is also critical.
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