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As some of you may have seen, I've been fighting to get my 2000 Durango back on the road...long story short, cylinder #2 dropped a valve seat with no warning....
Today 3/30/19 I finally got the heads removed (doing it all in the car...) and was talking with my dad and he had the crazy (in my opinion) idea of running a hone down the cylinders...he thinks it can be done with no issues...me I think its bad juju... over all look at the block...the antifreeze was not there when the intake was pulled...the heater lines flopped around leaked on it...the plastic is the broken guides from the timing chains...long story...don't ask lol
The first picture you can see is #2 cylinder where the piston hit the valve seat...going to try and clean it with some sea foam and or engine cleaner and use the shop vac to remove debris...
From what I have read around the web...honing with the engine still assembled in the vehicle is not the brightest idea...
Genuinely want to hear from the experts out there....
if you hone the cylinders im pretty sure you would need to replace the rings to get a proper seal. . . . . i wouldnt bother unless you have leakage past the rings
if you hone the cylinders im pretty sure you would need to replace the rings to get a proper seal. . . . . i wouldnt bother unless you have leakage past the rings
After cleaning the engine, I wiped the cylinder walls and could see the cross hatch marks on them still...so I left them alone...long story short, she lives again
Buy Durango with 5.2 engine, they never drop valve seats..., they don't have them!
4.7 valve seat dropping is unpreventable, I guess. So you are just waiting for next valve seat to drop and do same work again.
Buy Durango with 5.2 engine, they never drop valve seats..., they don't have them!
4.7 valve seat dropping is unpreventable, I guess. So you are just waiting for next valve seat to drop and do same work again.
Nah I like my '00....going to stick with her...265k before the valve seat dropped...so I going to try for another 265k or more
I would never hone a cylinder with a piston installed for a couple of major reasons. One, if you do, you don’t get the whole area of piston travel honed because, well there is a piston in the way... lol . And 2 honing creates residue both front the removed cylinder wall material and sand from the hone that need to be cleaned out. Otherwise it’s like installing sandpaper rings in the motor. The rings can rehire it in a way that is less than desirable...
car5car... correction, dropping seats is avoidable if you have oversized seats installed and staked properly....
dropping seats is avoidable if you have oversized seats installed and staked properly....
how much?
16 valves, it is not going to be cheap.
I think I read somewhere that valve seats drop at high RPM.
I have 04 Grand Cherokee with knocking 4.7 engine, I don't know if this is valve seat rattling of bad crank. I didn't diagnose it yet.
If this is valve seat, I will consider installing better valve seats, depending on price. I hope cylinder walls and pistons are OK.
2000 Durango 4.7L myth busting question
