I have a John Deere 435 Diesel with a Detroit 2-53 engine. I have owned it for several years. This is my second overhaul. I overhauled the engine about 8 years ago. We use it all summer long with a 8 ft finish mower. We mow lots of acreage. I also do some tractor pulling and have upgraded valve springs, pistons, and injectors. I usually do not de-tune it for mowing, the operators all know to take it easy and not to crowd the engine as it will melt down. Well my oldest son borrowed the tractor to mow his acreage (very tall and thick grass). I did not inform him not push the engine. As one might guess, it melted down. Stuck the pistons to the liners and totally locked the engine. I was very fortunate in that it did not do any damage to the block or head.
After a complete rebuild including .020 mains, std rods, new cam bearings, new idler gear, hub, and all new gaskets. Engine starts and runs great, however the oil pressure is low. After first start it carries 40 to 45 pounds until it warms up then drops to 20 lbs. I decided to replace the oil pump, could not find a 2-53 pump as they are obsolete. The factory options is to get the Detroit Diesel gear kit including instructions to machine a 3-53 pump gear set to fit the 2-53 housing. Upon further research and talking with tech support at Central Diesel (Detroit Diesel service and parts supplier) I decided the 3-53 pump and housing would fit, just need to replace the oil pump drive gear with a wider 3-53 drive gear. Mine had wear so it was good to replace it. Assembled everything, (yes it fits perfect) started the tractor and have the exact same problem. I removed the oil pressure relief valve, replaced the spring, and added some shims. Still have the exact same problem. The relief valve looks new with no wear showing, fits the housing perfectly, and moves very smoothly. I have tried two different manual gauges as well as the factory electric gauge. All show the same results. I am at wits end. My goal would be 35 lbs and max RPM and 5 to 10 at idle. Not sure where to go from here. All clearances are within specifications per the I & T 435D manual. Any help or suggestions?
Thanks
David L. Jones
https://www.youtube.com/watch?v=6PBUCWj7-eE
After a complete rebuild including .020 mains, std rods, new cam bearings, new idler gear, hub, and all new gaskets. Engine starts and runs great, however the oil pressure is low. After first start it carries 40 to 45 pounds until it warms up then drops to 20 lbs. I decided to replace the oil pump, could not find a 2-53 pump as they are obsolete. The factory options is to get the Detroit Diesel gear kit including instructions to machine a 3-53 pump gear set to fit the 2-53 housing. Upon further research and talking with tech support at Central Diesel (Detroit Diesel service and parts supplier) I decided the 3-53 pump and housing would fit, just need to replace the oil pump drive gear with a wider 3-53 drive gear. Mine had wear so it was good to replace it. Assembled everything, (yes it fits perfect) started the tractor and have the exact same problem. I removed the oil pressure relief valve, replaced the spring, and added some shims. Still have the exact same problem. The relief valve looks new with no wear showing, fits the housing perfectly, and moves very smoothly. I have tried two different manual gauges as well as the factory electric gauge. All show the same results. I am at wits end. My goal would be 35 lbs and max RPM and 5 to 10 at idle. Not sure where to go from here. All clearances are within specifications per the I & T 435D manual. Any help or suggestions?
Thanks
David L. Jones
https://www.youtube.com/watch?v=6PBUCWj7-eE