2000CL713 Posted November 10, 2017 Share Posted November 10, 2017 (edited) 2000 CL713 E7-427 without any modfcations. Im seeing 1000 degrees when pulling onto the highway but then goes down once up to speed. Is this in spec? Going to be putting a 460xt tune on my truck and want to make sure everything is working right before hand. Edited November 10, 2017 by 2000CL713 Quote Link to comment https://www.bigmacktrucks.com/topic/51629-exhaust-gas-temps/ Share on other sites More sharing options...
fjh Posted November 10, 2017 Share Posted November 10, 2017 Do you have a boost gauge? If your seeing less than 34 psi you need to check for boost leaks! Quote Link to comment https://www.bigmacktrucks.com/topic/51629-exhaust-gas-temps/#findComment-384562 Share on other sites More sharing options...
2000CL713 Posted November 10, 2017 Author Share Posted November 10, 2017 i was told my truck should be seeing 24-32 psi. Quote Link to comment https://www.bigmacktrucks.com/topic/51629-exhaust-gas-temps/#findComment-384565 Share on other sites More sharing options...
fjh Posted November 10, 2017 Share Posted November 10, 2017 Sorry I miss read I had 460 in my head , 32 would be adequate for a 427 are you seeing over thirty on the hard pull is the truck trailing any black smoke while pulling hard this is a sign of leaks! you do have a high pyro reading how ever if it is coming up to that after a reasonable mount of time your likley ok if it snaps up with in a minute or so Id be checking for leaks. just my opinion! Quote Link to comment https://www.bigmacktrucks.com/topic/51629-exhaust-gas-temps/#findComment-384585 Share on other sites More sharing options...
2000CL713 Posted November 10, 2017 Author Share Posted November 10, 2017 whats consider a non-high reading? Quote Link to comment https://www.bigmacktrucks.com/topic/51629-exhaust-gas-temps/#findComment-384607 Share on other sites More sharing options...
Mackpro Posted November 10, 2017 Share Posted November 10, 2017 1100-1200 would be be high in my book. Early Etech style engines had issues with intake manifold gaskets blowing out. They came out with steel core gaskets now that solved that problem. Quote Link to comment https://www.bigmacktrucks.com/topic/51629-exhaust-gas-temps/#findComment-384608 Share on other sites More sharing options...
2000CL713 Posted November 10, 2017 Author Share Posted November 10, 2017 should i boost leak test it at 35psi to make sure? i dont want to damage anything (o-rings/gaskets) so wanted to ask first. Quote Link to comment https://www.bigmacktrucks.com/topic/51629-exhaust-gas-temps/#findComment-384627 Share on other sites More sharing options...
Mack Technician Posted November 10, 2017 Share Posted November 10, 2017 Its a flow/pressure dilemma. Think hydraulic.....Think in terms of flow since you are constantly losing pressure because of escaping flow......... I'd use moderate pressure. The leak will show. By the time you reach 35 your chasing so much air through the open portions of the valve train you will not be able to hear a leak over the hissing inside the engine, unless soaping. Motor initially will turn a little under pressure (till centered in strokes), but some intake valve may stay open. You can manually rotate the motor to minimize loss, you will find sweet spots where intake valves are mostly closed. If I were doing a full tune package on your engine I would pull the valve rocker shafts + injectors and allow all the valves to close, then pressure test CMCAC circuit. If I see/hear/detect air coming up through the injector nipple bores you know your intake valves are a little sketchy. Quote Link to comment https://www.bigmacktrucks.com/topic/51629-exhaust-gas-temps/#findComment-384629 Share on other sites More sharing options...
fjh Posted November 10, 2017 Share Posted November 10, 2017 1 minute ago, Mack Technician said: Its a flow/pressure dilemma. Think hydraulic.....Think in terms of flow since you are constantly losing pressure because of escaping flow......... I'd use moderate pressure. The leak will show. By the time you reach 35 your chasing so much air through the open portions of the valve train you will not be able to hear a leak over the hissing inside the engine, unless soaping. Motor initially will turn a little under pressure (till centered in strokes), but some intake valve may stay open. You can manually rotate the motor to minimize loss, you will find sweet spots where intake valves are mostly closed. If I were doing a full tune package on your engine I would pull the valve rocker shafts + injectors and allow all the valves to close, then pressure test CMCAC circuit. If I see/hear/detect air coming up through the injector nipple bores you know your intake valves are a little sketchy. WHAT HE SAID! Can hurt to know! 1 Quote Link to comment https://www.bigmacktrucks.com/topic/51629-exhaust-gas-temps/#findComment-384630 Share on other sites More sharing options...
2000CL713 Posted November 10, 2017 Author Share Posted November 10, 2017 headed to the store in the morning or maybe tonight. truck is at yard. anyone know offhand what size the piping is so i can make a boost tester? Quote Link to comment https://www.bigmacktrucks.com/topic/51629-exhaust-gas-temps/#findComment-384633 Share on other sites More sharing options...
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