New head gaskets leak
#1
New head gaskets leak
I just rebuilt the top end on my 2001 ranger 3.0 and everything was torqued to specs in sequence. heads were rebuild professionally and pressure checked for cracks and it leaked coolant out of the front of the paasenger head and ruined the oil all over again any ideas????
#2
#3
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Lower intake manifold is part of the cooling system, on all "V" engines, so has cross-over coolant passages from head to head.
All 4 corners of lower intake have coolant present.
If lower intake manifold gasket leaks you would end up with coolant in the oil.
So drain all the coolant
remove lower intake and look in the Valley, where Cam is, if there is coolant in there then lower intake was where it came from.
On the 3.0l the front engine cover, timing chain cover, has coolant passages for the water pump, these can leak, and it could run down inside the cover into the oil pan.
The heads themselves only have a couple of oil passages, for valve train oiling, and then a few Drain back holes to oil pan.
Blown head gaskets rarely cause coolant to go into oil pan anymore, usually just overheating as coolant is pushed into overflow tank because of cylinder pressure, 900psi, escaping into head coolant passages and displacing the coolant.
In the "good ol' days" the paper head gaskets would disintegrate once metal cylinder ring "blew out", so coolant in the oil was common, with composite head gaskets that just doesn't happen much
And way down on the list but not impossible, is a cracked block, this is usually a casting flaw, but doesn't show up until engine is overheated and metal expands more than it should, then flaw cracks and coolant flows into oil pan
All 4 corners of lower intake have coolant present.
If lower intake manifold gasket leaks you would end up with coolant in the oil.
So drain all the coolant
remove lower intake and look in the Valley, where Cam is, if there is coolant in there then lower intake was where it came from.
On the 3.0l the front engine cover, timing chain cover, has coolant passages for the water pump, these can leak, and it could run down inside the cover into the oil pan.
The heads themselves only have a couple of oil passages, for valve train oiling, and then a few Drain back holes to oil pan.
Blown head gaskets rarely cause coolant to go into oil pan anymore, usually just overheating as coolant is pushed into overflow tank because of cylinder pressure, 900psi, escaping into head coolant passages and displacing the coolant.
In the "good ol' days" the paper head gaskets would disintegrate once metal cylinder ring "blew out", so coolant in the oil was common, with composite head gaskets that just doesn't happen much
And way down on the list but not impossible, is a cracked block, this is usually a casting flaw, but doesn't show up until engine is overheated and metal expands more than it should, then flaw cracks and coolant flows into oil pan
Last edited by RonD; 02-15-2017 at 10:16 AM.
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