braden Posted January 7, 2015 Author Share Posted January 7, 2015 nah I brought it but it could've broken a cambelt and bent valves but difinately has had new piston and rings put in it. Quote Link to comment Share on other sites More sharing options...
ajg193 Posted January 7, 2015 Share Posted January 7, 2015 "If a Mitsubishi-designed engine has low compression, the MCA-Jet valve(s) could be the cause." - Wikipedia Quote Link to comment Share on other sites More sharing options...
braden Posted January 7, 2015 Author Share Posted January 7, 2015 yeah they could be.pretty sure valve related but unusual that all are like 40psi. Quote Link to comment Share on other sites More sharing options...
eke_zetec_RWD Posted January 7, 2015 Share Posted January 7, 2015 Leak down test results yet? Quote Link to comment Share on other sites More sharing options...
braden Posted January 7, 2015 Author Share Posted January 7, 2015 nah man havnt checked yet got to make a leak tester and forgot bring airgun home Quote Link to comment Share on other sites More sharing options...
downtrail Posted January 7, 2015 Share Posted January 7, 2015 Sorry to sound harsh but how does one obtain a "fresh" rebuild with bent valves? If its truely a new build surely a visual examination of the head before assembly would point this out. If it was really rebuild logic says drop out valves replace stem seals etc examine valves cut them back into seats check seal etc. Only thing I could forsee is if the cam belt was incorrectly installed motor not tuned over by hand to check for binding etc and just cranked straight away. If this is the case you may well have ruined the pistions in the process more than likely broken valve guides and possibly ruined the seats by bashing the valves into them. Dont take it to heart but this dosent make sense to me. If one is competent enough to rebuild a motor measuring and following close tolerances then one should also know how to time up motor to avoid such catastrophe for occuring to begin with Quote Link to comment Share on other sites More sharing options...
eke_zetec_RWD Posted January 7, 2015 Share Posted January 7, 2015 Sorry to sound harsh but how does one obtain a "fresh" rebuild with bent valves? If its truely a new build surely a visual examination of the head before assembly would point this out. If it was really rebuild logic says drop out valves replace stem seals etc examine valves cut them back into seats check seal etc. Only thing I could forsee is if the cam belt was incorrectly installed motor not tuned over by hand to check for binding etc and just cranked straight away. If this is the case you may well have ruined the pistions in the process more than likely broken valve guides and possibly ruined the seats by bashing the valves into them. Dont take it to heart but this dosent make sense to me. If one is competent enough to rebuild a motor measuring and following close tolerances then one should also know how to time up motor to avoid such catastrophe for occuring to begin with Ohh harsh! Just curious to know if the compression tester you used was home made also? Or have you checked it on a known good engine? 1 Quote Link to comment Share on other sites More sharing options...
UTERUS Posted January 7, 2015 Share Posted January 7, 2015 Quality read, A+ would read again. 9 Quote Link to comment Share on other sites More sharing options...
Ranter Posted January 7, 2015 Share Posted January 7, 2015 It would need to be a highly modified engine to bend valves or a combination of 2.4 and 2.0 parts. Or more simply, valves have not hit pistons. Jet valves (which I completely forgot about) are usually left alone but if removed are always blanked off. Quote Link to comment Share on other sites More sharing options...
flyingbrick Posted January 8, 2015 Share Posted January 8, 2015 Maybe it has low compression pistons fitted 2 Quote Link to comment Share on other sites More sharing options...
braden Posted January 8, 2015 Author Share Posted January 8, 2015 nah and not very likely to bend all valves and there a no contact engine so if cambelt breaks don't usually bend valves on them.think iv found the problem guys had bottom end rebuilt by the motor builder.then hes put the head on and the head bolts were hardly even tight when should be tight as fuck to a torque setting Quote Link to comment Share on other sites More sharing options...
UTERUS Posted January 8, 2015 Share Posted January 8, 2015 I'm done. 6 Quote Link to comment Share on other sites More sharing options...
AllTorque Posted January 8, 2015 Share Posted January 8, 2015 You should probably make sure there is a head gasket there. 5 Quote Link to comment Share on other sites More sharing options...
flyingbrick Posted January 8, 2015 Share Posted January 8, 2015 Maybe there are no rings on the new pistons Quote Link to comment Share on other sites More sharing options...
ajg193 Posted January 8, 2015 Share Posted January 8, 2015 I'm still voting for upside down rings. Quote Link to comment Share on other sites More sharing options...
Mof Posted January 8, 2015 Share Posted January 8, 2015 And no big end bearings Quote Link to comment Share on other sites More sharing options...
downtrail Posted January 8, 2015 Share Posted January 8, 2015 Or no valves lol 1 Quote Link to comment Share on other sites More sharing options...
Seedy Al Posted January 8, 2015 Share Posted January 8, 2015 Um. I don't even. 1 Quote Link to comment Share on other sites More sharing options...
Hemi Posted January 8, 2015 Share Posted January 8, 2015 This thread is great! 2 Quote Link to comment Share on other sites More sharing options...
Lunacy Posted January 9, 2015 Share Posted January 9, 2015 Like. Quote Link to comment Share on other sites More sharing options...
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