Melted intake
- Thread starter FRAN_12F
- Start date
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Tim Garceau
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- 2014 Sport Quad BSP
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- 3.92 8 Speed 5.7 4X4
LMAO, EGR blockage
If deleted, intake valve seat broken allowing exhaust gas back up.
If deleted, intake valve seat broken allowing exhaust gas back up.
Last edited:
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WOW did not know that could happen ! I never fail to learn something new here !
Tim Garceau
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- 3.92 8 Speed 5.7 4X4
It’s a good thing with this one, the Ecodiesel forum know what I’m talking about!
PNUTLT1
Senior Member
My bad someone hacked my account as did this **** lol
My bad everyone
It’s funny but still rude and unacceptable
My bad everyone
It’s funny but still rude and unacceptable
Fast69Mopar
Senior Member
I have seen plenty of melted intake manifolds but majority of them have been 3.7/4.7 intakes. I have seen a few of the 5.7 intakes melted but they were from the early 03-04 trucks.When looking at the Freeze Frame data in the DRB-III back then the engine coolant temps reached 285-295 degrees on the motors with the melted intake manifolds.
Fast69Mopar
Senior Member
The block from the 2003 5.7 survived after some machine work to make the bores round again. It took a . 040" overbore to straighten it out. Back then we built almost everything if the block could be saved. The 2004 5.7 was trash. One of the heads had a 1/4" difference in flatness from one end to the other. The crank had black and blue heat marks all over it.
None of the 3.7/4.7 motors survived after they reached those temps. There were too many parts needed to repair them so they go the 70% rule and had a reman long block stuck between the frame rails.
OCDTech
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Just was curious, all motors handle that much heat differently, especially newer ones, and being aluminum for sure. Me and buddy overheated an old 80s chevy 350 to the point of full lock up. Let it cool, put more water in drove for years. Won't be getting away with that anymore probably. I had a 4.2 ford v-6 years ago, i asked my buddy that worked at ford at the time about them, he said they're great, just never run it hot. I took his advise. Made sure i never did. I got the feeling what he was trying to say.
FRAN_12F
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Must be the egr valve ? I was just rebuilding this engine to put a Greene racing cam do too a bad lifter. And seats looked fine lapped the valves and put the heads back on and when I got to the intake I noticed something didn't look right. Obviously I bought a new one but I haven't fired this engine up yet and don't want the same out come on a total fresh top to bottom rebuild.
Fast69Mopar
Senior Member
I wouldn't think an EGR restriction would cause the intake manifold to melt but a stuck open EGR valve would allow the hot exhaust gases to flow full time through the intake.
If you are going to do some custom tuning for the new camshaft I would delete the EGR valve.
If you are keeping the EGR system I would install a new EGR valve.
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