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5.7 hemi question for chrysler/ dodge techs #907361 01/17/11 04:36 PM 01/17/11 04:36 PM
Joined: Sep 2003 Posts: 191 Vernon, NJ P PDFrogman OP member
PDFrogman OP member P Joined: Sep 2003 Posts: 191 Vernon, NJ	my 04 Durango with a 5.7 hemi broke the 7 rod the car sat for almost 6 weeks from sept to nov when I started the truck, the rod broke I'm pretty sure it was a hydraulic lock my question is would a bad injector leak down enough to cause it? the cyl in question had a pretty dirty looking injector (see pics) and the next cylinder was clean, looks brand new motor ran great was well maintained and had 198K cylinder walls still had a crosshatch pattern and there was no ridge there was no evidence of a bad head gasket had to replace motor had a crack where the rod broke want to avoid this in future more pics http://i375.photobucket.com/albums/oo200/pdfrogman/dirtyinjector.jpg http://i375.photobucket.com/albums/oo200/pdfrogman/cleaninjector.jpg http://i375.photobucket.com/albums/oo200/pdfrogman/2011-01-15_11-24-05_699.jpg 6423311-brokenpiston.jpg (220 downloads) Last edited by PDFrogman; 01/17/11 04:43 PM.

Re: 5.7 hemi question for chrysler/ dodge techs [Re: PDFrogman] #907362 01/17/11 04:45 PM 01/17/11 04:45 PM
Joined: Jan 2003 Posts: 28,068 Irving, TX feets Senior Management
feets Senior Management Joined: Jan 2003 Posts: 28,068 Irving, TX	You've got what looks like water bubbles in the oil. Look at the near side bolt boss and the far side bearing surface. Did that water come from teardown or the block cracking? We are brothers and sisters doing time on the planet for better or worse. I'll take the better, if you don't mind. - Stu Harmon

Re: 5.7 hemi question for chrysler/ dodge techs [Re: feets] #907363 01/17/11 04:47 PM 01/17/11 04:47 PM
Joined: Sep 2003 Posts: 191 Vernon, NJ P PDFrogman OP member
PDFrogman OP member P Joined: Sep 2003 Posts: 191 Vernon, NJ	Quote: You've got what looks like water bubbles in the oil. Look at the near side bolt boss and the far side bearing surface. Did that water come from teardown or the block cracking? most likely from tear down the oil was clean no evidence of water in the oil either. the truck sat another 6 weks after the motor broke we took the motor out over the weekend FRANK 1970 Road Runner sold! 1969 Sport Satellite convert 1973 383 Challenger six pack 2004 Hemi Durango 2006 jeep grand Cherokee limited

Re: 5.7 hemi question for chrysler/ dodge techs [Re: PDFrogman] #907364 01/17/11 04:51 PM 01/17/11 04:51 PM
Joined: Jan 2003 Posts: 17,860 S.E. Michigan ZIPPY I Live Here
ZIPPY I Live Here Joined: Jan 2003 Posts: 17,860 S.E. Michigan	Quote: would a bad injector leak down enough to cause it? Yes Rich H. Esse Quam Videri

Re: 5.7 hemi question for chrysler/ dodge techs [Re: ZIPPY] #907365 01/17/11 04:53 PM 01/17/11 04:53 PM
Joined: Sep 2003 Posts: 191 Vernon, NJ P PDFrogman OP member
PDFrogman OP member P Joined: Sep 2003 Posts: 191 Vernon, NJ	Quote: Quote: would a bad injector leak down enough to cause it? Yes injector appears to be clogged I cant blow compressed air into it the intake also had the crud around it. could it just have been a build up of bad gas at the end of the rail and it just sat there? FRANK 1970 Road Runner sold! 1969 Sport Satellite convert 1973 383 Challenger six pack 2004 Hemi Durango 2006 jeep grand Cherokee limited

Re: 5.7 hemi question for chrysler/ dodge techs [Re: PDFrogman] #907366 01/17/11 05:53 PM 01/17/11 05:53 PM
Joined: Jan 2003 Posts: 17,860 S.E. Michigan ZIPPY I Live Here
ZIPPY I Live Here Joined: Jan 2003 Posts: 17,860 S.E. Michigan	No airflow through it, with it removed from the engine means it isn't stuck wide open at the moment. Normal fuel pressure is about 58psi, and if there is even the slightest injector leak at any time, pretty much all the fuel is going to come out into that cylinder. The mechanism in the injector only needs to hang up or stick for a second, to destroy a motor. Just a possibility.... Rich H. Esse Quam Videri

Re: 5.7 hemi question for chrysler/ dodge techs [Re: ZIPPY] #907367 01/17/11 06:17 PM 01/17/11 06:17 PM
Joined: Sep 2003 Posts: 191 Vernon, NJ P PDFrogman OP member
PDFrogman OP member P Joined: Sep 2003 Posts: 191 Vernon, NJ	Quote: No airflow through it, with it removed from the engine means it isn't stuck wide open at the moment. Normal fuel pressure is about 58psi, and if there is even the slightest injector leak at any time, pretty much all the fuel is going to come out into that cylinder. The mechanism in the injector only needs to hang up or stick for a second, to destroy a motor. Just a possibility.... my question why is only that injector caked with crud? FRANK 1970 Road Runner sold! 1969 Sport Satellite convert 1973 383 Challenger six pack 2004 Hemi Durango 2006 jeep grand Cherokee limited

Re: 5.7 hemi question for chrysler/ dodge techs [Re: PDFrogman] #907368 01/17/11 07:27 PM 01/17/11 07:27 PM
Joined: Jan 2003 Posts: 28,068 Irving, TX feets Senior Management
feets Senior Management Joined: Jan 2003 Posts: 28,068 Irving, TX	That injector probably had a bit of nastiness in it. That can change the spray pattern to more of a dribble. When that happens the fuel doesn't burn efficiently. Deposits build up and the situation gets worse. It might have hung open long enough to flood the cylinder and closed afterwards. We are brothers and sisters doing time on the planet for better or worse. I'll take the better, if you don't mind. - Stu Harmon

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