We have a compact 4320 It is a 2010 year, I wanted to do the same, Our engine is a common rail fuel system ( just like a old Detroit system) There is no computer in our system, The only difference between a 4120 4320 4520 4720 is the part no on the unit injectors. To upgrade to a 4720 (66hp) injectors cost about $1800 nor counting Labor to install them. The book did say there was 3 different engines, Our serial Number didn't have any electronics.on the engine. It is a Ehydro has electronics on the hydro. After a few hrs doesn't seem to need any more hp to do what we do with it.
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Today's Featured Article - Piston Ring Removal and Replacement - by Chris Pratt. Piston Ring Removal and Replacement - Replacing rings is a fairly easy process to stretch the engines usability between major rebuilds and cut down on that blue smoke and high oil consumption. Frequently, replacing only the rings is not advisable because by the time you do the teardown and measurement of the components, the pistons are often beyond the manufacturers specification or something else you find will signify the need for a major rebu
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