Motor problem

gearmesh, inc. · 05-31-2010, 11:40 PM

I just got done on a 4.7 Dodge that overheated and caused an exhaust valve seat to drop out of the head. Since the valve couldn't rise up far enough in the head with the dislodged valve seat, it let the roller cam follower jump out of place when the cam came around on the base circle. Keep an eye out for dislodged valve seats when you tear that 5.4 down. Dislodged seats can cause valve bending, too.

Sounds like you may have an oil pressure problem, too. From what I can remember from my Ford technician days (whew, long time ago!) when mod motors first came out, mod motor oil pump gears might be powdered metal like the factory con rods. We all know how strong those are, now don't we?

05-31-2010, 11:40 PM	#3
gearmesh, inc. creepy azz cracka Join Date: Nov 2008 Location: Summerville Posts: 1,587	I just got done on a 4.7 Dodge that overheated and caused an exhaust valve seat to drop out of the head. Since the valve couldn't rise up far enough in the head with the dislodged valve seat, it let the roller cam follower jump out of place when the cam came around on the base circle. Keep an eye out for dislodged valve seats when you tear that 5.4 down. Dislodged seats can cause valve bending, too. Sounds like you may have an oil pressure problem, too. From what I can remember from my Ford technician days (whew, long time ago!) when mod motors first came out, mod motor oil pump gears might be powdered metal like the factory con rods. We all know how strong those are, now don't we? __________________ "I came into this world kicking, screaming,and covered in someone else's blood, I have no problem leaving the same way!" ÔÇ£If you carry a gun, people will call you paranoid. ThatÔÇÖs ridiculous. If I have a gun, what in the hell do I have to be paranoid about?ÔÇØ -Clint Smith, Thunder Ranch.