purepressure2004 Posted October 11, 2009 Share Posted October 11, 2009 Is there anyone out there that knows where I can get a fuel pump for the EN540 engine or even parts to rebuild it? If I dont start the truck at least every couple of days it seems like the gas syphones back down to the tank, and I have to reprime system. Any kind of help would be great. Quote Mack and OshKosh enthusiest in central CT Link to comment https://www.bigmacktrucks.com/topic/11003-en540/ Share on other sites More sharing options...
Rob Posted October 11, 2009 Share Posted October 11, 2009 Is there anyone out there that knows where I can get a fuel pump for the EN540 engine or even parts to rebuild it? If I dont start the truck at least every couple of days it seems like the gas syphones back down to the tank, and I have to reprime system. Any kind of help would be great.The problem you explain sounds more like carburation than fuel pump related. It sounds like the float bowl is draining. If it is Zenith carb, the two brass screws/caps in the lower part of the float bowl could be leaking.Rob Quote Plodding along with no job nor practical application for my existence, but still trying to fix what's broke. Link to comment https://www.bigmacktrucks.com/topic/11003-en540/#findComment-41718 Share on other sites More sharing options...
purepressure2004 Posted October 11, 2009 Author Share Posted October 11, 2009 Thanx alot! I'll check definately check it out! Quote Mack and OshKosh enthusiest in central CT Link to comment https://www.bigmacktrucks.com/topic/11003-en540/#findComment-41732 Share on other sites More sharing options...
Old Macks Posted October 15 Share Posted October 15 Does anyone have the specs for EN540 pistons? Quote Link to comment https://www.bigmacktrucks.com/topic/11003-en540/#findComment-560101 Share on other sites More sharing options...
Joey Mack Posted October 15 Share Posted October 15 im not sure what you are needing,, specs? are making your own pistons? this book has a lot of part numbers... you may find what you need in here.. Quote Link to comment https://www.bigmacktrucks.com/topic/11003-en540/#findComment-560105 Share on other sites More sharing options...
Old Macks Posted October 16 Share Posted October 16 2 hours ago, Joey Mack said: im not sure what you are needing,, specs? are making your own pistons? this book has a lot of part numbers... you may find what you need in here.. I do not have a copy of that book. Does it have information on the EN540? If so, can you post it? Quote Link to comment https://www.bigmacktrucks.com/topic/11003-en540/#findComment-560121 Share on other sites More sharing options...
steve s. Posted October 16 Share Posted October 16 The 540 bore is 4-7/16", piston clearance at top of skirt .002", minimum ring end gap .016". This info is from a 1966 Motors Manual. Quote Link to comment https://www.bigmacktrucks.com/topic/11003-en540/#findComment-560124 Share on other sites More sharing options...
Old Macks Posted October 16 Share Posted October 16 1 hour ago, steve s. said: The 540 bore is 4-7/16", piston clearance at top of skirt .002", minimum ring end gap .016". This info is from a 1966 Motors Manual. Thanks Steve. I appreciate it. Quote Link to comment https://www.bigmacktrucks.com/topic/11003-en540/#findComment-560132 Share on other sites More sharing options...
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