acegreaser Posted September 30, 2010 Share Posted September 30, 2010 Just got done rebuilding 427 ai out of frame.Ran great now after 2 days of running all of sudden no power and once you get above 1400 rpm no load starts missing and blowing white and tan smoke.Idles perfect and up until 1400 runs and sounds good no load.Replaced all six injectors #6 was soaked others were ok but still changed them.Still same problem.Changed uni pump on #6 still the same.Checked fuel pressure at fuel temp port.Between 60 and 70 psi through out the entire rpm range even while missing.Replaced fuel line from tank to primary filter.Checked fuel regulator coming out of block.Brand new turbo also on engine.Checked inter cooler for leaks.Under load hs zero power and pouring out black smoke and missing bad.Almost like like computer isn't adjusting for uni pump timing through the rpm range.Help!!!!!!!!! Quote Link to comment Share on other sites More sharing options...
rhasler Posted September 30, 2010 Share Posted September 30, 2010 Just got done rebuilding 427 ai out of frame.Ran great now after 2 days of running all of sudden no power and once you get above 1400 rpm no load starts missing and blowing white and tan smoke.Idles perfect and up until 1400 runs and sounds good no load.Replaced all six injectors #6 was soaked others were ok but still changed them.Still same problem.Changed uni pump on #6 still the same.Checked fuel pressure at fuel temp port.Between 60 and 70 psi through out the entire rpm range even while missing.Replaced fuel line from tank to primary filter.Checked fuel regulator coming out of block.Brand new turbo also on engine.Checked inter cooler for leaks.Under load hs zero power and pouring out black smoke and missing bad.Almost like like computer isn't adjusting for uni pump timing through the rpm range.Help!!!!!!!!!Make sure the EUP you installed was a 313GC5230M(X). Did you have the new cal code programmed? We got some ReMack injectors that wouldn't pop at the correct pressure not too long ago. Did you do anything with the camshaft and lifters while rebuilding? The lifters for that engine have ceramic rollers that are prone to damage if not handled carefully. Quote "Mebbe I'm too ugly and stupid to give up!" Link to comment Share on other sites More sharing options...
fjh Posted October 1, 2010 Share Posted October 1, 2010 Make sure the EUP you installed was a 313GC5230M(X). Did you have the new cal code programmed? We got some ReMack injectors that wouldn't pop at the correct pressure not too long ago. Did you do anything with the camshaft and lifters while rebuilding? The lifters for that engine have ceramic rollers that are prone to damage if not handled carefully.Smoking and missing ?! I would suspect a bad powerleash rocker if the engine is equiped with it!Or an injector stuck open. Just my 2 bits! Quote Link to comment Share on other sites More sharing options...
fjh Posted October 2, 2010 Share Posted October 2, 2010 Smoking and missing ?! I would suspect a bad powerleash rocker if the engine is equiped with it!Or an injector stuck open. Just my 2 bits!Hey greaser did you get this sorted out yet? Quote Link to comment Share on other sites More sharing options...
acegreaser Posted October 5, 2010 Author Share Posted October 5, 2010 yes sorry for getting back so late.Truck is like a homing pigeon just keeps coming back for different things.Found the turbine to snap off the shaft blocking the exhaust.Strange that the compressor side felt normal,[no play,and spun freely]Couldn't even pull the shaft for excess end play.Now i'll check both sides on the turbo next time just for this reason.It was a reman turbo right from mack only lasted 8 hours.The dealer said he had a bunch back for the same reason including volvos.One of the new uni pumps started leaking at the flare where injector lines seal.Tried a nother new line and 2 old ones still spraying had to replaced uni pump with another.It would have to be #6.At least the customer was understanding and knew it wasn't due to the service just faulty parts. Quote Link to comment Share on other sites More sharing options...
fjh Posted October 6, 2010 Share Posted October 6, 2010 yes sorry for getting back so late.Truck is like a homing pigeon just keeps coming back for different things.Found the turbine to snap off the shaft blocking the exhaust.Strange that the compressor side felt normal,[no play,and spun freely]Couldn't even pull the shaft for excess end play.Now i'll check both sides on the turbo next time just for this reason.It was a reman turbo right from mack only lasted 8 hours.The dealer said he had a bunch back for the same reason including volvos.One of the new uni pumps started leaking at the flare where injector lines seal.Tried a nother new line and 2 old ones still spraying had to replaced uni pump with another.It would have to be #6.At least the customer was understanding and knew it wasn't due to the service just faulty parts.Good find ! I'll be watching for this too! Quote Link to comment Share on other sites More sharing options...
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