#4 cylinder not firing / Water / cracked head

[mlunsford]

I have a 99 4.0 OHV engine 104K miles and my number plug keeps fouling due to water. I did a leak down test (I was close to TDC) and it leaked and water starting coming out the radiator. Definitely a leak somewhere. Probably a gasket and cracked head. But is it possible the lower intake gasket could also leak water into the #4 cylinder ?

If I end up changing the heads, should I do the water pump and timing chain ?

Anyone with a recommendation of where to buy heads ?

Aftermarket or dealer gaskets ?

Thanks !!

 

[Explorin94]

Your best bet would be to tear it down and find what your problem is first. If it is just a head gasket and you can see it is blown and have the head checked and replace the gasket if the head is fine. I don't see it being the intake gasket as #4 is the center bore and there are no coolant passages close. The timing chain would depend on the mileage that is on the truck. If the waterpump is seeping at the weep holes change it.

 

[MAKG]

There is no way a leakdown test can push water through the lower intake gasket. It's DEFINITELY a head, head gasket, or maybe the engine block (unlikely).

I'd agree with the advice above. Pull both heads off and look for cracks. If you don't find any, have them Magnafluxed.