4.0 Engine aftermarket manifolds - beware!
Just wanted to share some negative experience.
First of all, my old manifold developed a crack, as it often happens. I noticed it from the ticking noise which became louder under load.
I was stupid enough to try welding it. Sure, my welds held well, but a month after it cracked again in another place. Fault by design, I presume.
So, I got an aftermarket Ebay kind of a manifold, $100 variety with bellows on sides. Hundreds of them for sale, $80-$120 with free shipping. Pulled the manifold second time.
First of all, I had trouble fitting it on. It just didn't want to go with intake manifold in place. When I (long after) pulled the gasket, found that one intake port and exhaust port were sitting right next to each other. Some grinding on the exhaust ports would have sorted this out.
Anyhow, I jammed it on. Shortly after fitting - surprise! Ticking is back again.
Pulled the manifold, for the THIRD time - found the reason. The ports on the aftermarket manifold don't sit where they're supposed to sit! Gasket holes didn't overlap properly with the manifold, and the gasket just blew in the thinnest place - wasnt even a hairline worth of gasket there.
Anyway, just an advice: check fitment with your gasket too, check how much actual gasket you have between the inside hole in gasket and the outside edge of the por! Don't just assume it's done properly by the manufacturer, since it's all made in China and they don't give a crap.
Last edited by shaban; 03-18-2013 at 04:59 AM..