Head gasket 0331 - what else should I do?
#92
Old fart with a wrench
Joined: Nov 2010
Posts: 14,398
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From: Manlius, east of Syracuse, NY
Year: 2000 XJ Sport & WJ Laredo
Model: Grand Cherokee (WJ)
Engine: 4.0L
The oil pump drive assembly could be the cam sensor drive shaft and I can see that being damaged very easily. The "freeze" plugs are actually casting core support holes that hold the cores that make the cooling jacket. After casting the metal, the sand cores are broken off and the cores themselves broken up into just sand by either banging on the block with hammers or by ultrasound. Then the core holes are machined to take mental plates bent in a cupped form and flattened to seal. The ones in the back should be true 303 stainless steel so they don't rust ever, but usually aren't. I've seen antique engines with brass plugs in them, although those systems weren't pressurized.
Any engine can be kept perfectly clean inside simply be running it 30 minutes after to gets to OT to evaporate all the water condensation that's built up after letting it cool overnight.
Any engine can be kept perfectly clean inside simply be running it 30 minutes after to gets to OT to evaporate all the water condensation that's built up after letting it cool overnight.
#93
Old fart with a wrench
Joined: Nov 2010
Posts: 14,398
Likes: 729
From: Manlius, east of Syracuse, NY
Year: 2000 XJ Sport & WJ Laredo
Model: Grand Cherokee (WJ)
Engine: 4.0L
It probably has debris on it's seat that entered after it was removed from the car and should be only stuck there by the pressure of the valve spring. Vacuum it out, turn the crank until both valves in that cylinder are open, then use air pressure to blow it out.
#94
Thread Starter
Junior Member
Joined: Aug 2019
Posts: 40
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From: Long Island, NY
Year: 2000
Model: Grand Cherokee (WJ)
Engine: 4.0
Seriously again - thanks to everyone who has commented on this thread. I think you've been helping keep me sane through this engine thing!
#95
CF Veteran
Joined: Nov 2015
Posts: 2,806
Likes: 180
From: syracuse ny
Year: 1997
Model: Grand Cherokee (ZJ)
Engine: 4.0, new lifters valve job with new springs and exhaust valves, preload set with shims
Valve stuck open or is it opening with the cam? Might be normal valve operation if the rockers and pushrods are all in. Probably close when you rotate the crankshaft.
If that's the intake valve it looks reasonably clean.
If that's the intake valve it looks reasonably clean.
Last edited by 97grand4.0; 09-28-2019 at 04:48 PM.
#96
Old fart with a wrench
Joined: Nov 2010
Posts: 14,398
Likes: 729
From: Manlius, east of Syracuse, NY
Year: 2000 XJ Sport & WJ Laredo
Model: Grand Cherokee (WJ)
Engine: 4.0L
Yeah, okay guys. I'm still a little bit whonky after just getting out of the hospital so it could just be "up on the cam." D'oh!
Sorry, for the last 4 days I've been being pumped full of the best antibiotics available to kill a pneumonia infection, but the first thing I had to do after getting home was to get caught up with this engine job!
Sorry, for the last 4 days I've been being pumped full of the best antibiotics available to kill a pneumonia infection, but the first thing I had to do after getting home was to get caught up with this engine job!
#97
CF Veteran
Joined: Nov 2015
Posts: 2,806
Likes: 180
From: syracuse ny
Year: 1997
Model: Grand Cherokee (ZJ)
Engine: 4.0, new lifters valve job with new springs and exhaust valves, preload set with shims
That's ok Dave. I think they may need you to explain how to put in a cam sensor.
#98
Thread Starter
Junior Member
Joined: Aug 2019
Posts: 40
Likes: 0
From: Long Island, NY
Year: 2000
Model: Grand Cherokee (WJ)
Engine: 4.0
Valves are opening and closing normally when we turn the engine!
New problem: manifold bolts.The two middle ones on the bottom are corroded and not spinning and snapped off. Working on ways to get them out because we want to drop this engine in as is with as many of it's original parts as possible. Worst case is we'll use the Clearwater head but we're hoping to sell that. Of course my plan of having it ready to drop in this weekend was terrifically optimistic lol.
New problem: manifold bolts.The two middle ones on the bottom are corroded and not spinning and snapped off. Working on ways to get them out because we want to drop this engine in as is with as many of it's original parts as possible. Worst case is we'll use the Clearwater head but we're hoping to sell that. Of course my plan of having it ready to drop in this weekend was terrifically optimistic lol.
#99
CF Veteran
Joined: Nov 2015
Posts: 2,806
Likes: 180
From: syracuse ny
Year: 1997
Model: Grand Cherokee (ZJ)
Engine: 4.0, new lifters valve job with new springs and exhaust valves, preload set with shims
Valves are opening and closing normally when we turn the engine!
New problem: manifold bolts.The two middle ones on the bottom are corroded and not spinning and snapped off. Working on ways to get them out because we want to drop this engine in as is with as many of it's original parts as possible. Worst case is we'll use the Clearwater head but we're hoping to sell that. Of course my plan of having it ready to drop in this weekend was terrifically optimistic lol.
New problem: manifold bolts.The two middle ones on the bottom are corroded and not spinning and snapped off. Working on ways to get them out because we want to drop this engine in as is with as many of it's original parts as possible. Worst case is we'll use the Clearwater head but we're hoping to sell that. Of course my plan of having it ready to drop in this weekend was terrifically optimistic lol.
#100
Thread Starter
Junior Member
Joined: Aug 2019
Posts: 40
Likes: 0
From: Long Island, NY
Year: 2000
Model: Grand Cherokee (WJ)
Engine: 4.0
#101
CF Veteran
Joined: Nov 2015
Posts: 2,806
Likes: 180
From: syracuse ny
Year: 1997
Model: Grand Cherokee (ZJ)
Engine: 4.0, new lifters valve job with new springs and exhaust valves, preload set with shims
If you mean they are already cut flush to the head and nothing to grip on to, only one option, drill out and tap. Can tap a little undersize and just have a couple 'special' bolts. Easier to do it now with the engine on the stand.
Last edited by 97grand4.0; 09-29-2019 at 08:03 PM.
#102
Banned
Joined: Feb 2019
Posts: 1,359
Likes: 169
From: NC
Year: 2004
Model: Grand Cherokee (WJ)
Engine: 4.0
Be extremely careful if you take a drill to metal. Go very SLOW. High RPMs, hand drills, torque, and metal do not mix well. If it catches somehow in any way it could hurt you very badly, or the metal, or snap a drill bit...
#103
Thread Starter
Junior Member
Joined: Aug 2019
Posts: 40
Likes: 0
From: Long Island, NY
Year: 2000
Model: Grand Cherokee (WJ)
Engine: 4.0
There's something to grip but it's not turning. He tried one of those extractor sockets and it wouldn't grip. We have a tap and die kit and my partner is planning on trying to do it today. He's nervous as heck about using power tools on the head, and I don't blame him.
#104
Senior Member
Joined: Nov 2017
Posts: 535
Likes: 101
From: Northern Indiana
Year: 2000, 1991
Model: Cherokee (XJ)
Engine: 4.0
The bolt will be hard to drill. The objective is to get the drill started in the center and not to take metal out of the head. Try to put a indentation in the center of the broken bolt with a center punch to help get the drill started in the right place. On each bolt use a new, much smaller bit initially. Lubricate the drill/bolt with light oil throughout the drilling process and take it slow. Wear safety glasses. Work up in drill size but try to stay under a diameter of what is called the root diameter (also called minor diameter) of the bolt thread – the inner/smallest diameter of the thread, and don’t go deeper than the bolt. Take best measurements that you can from a good bolt. You can find root diameter dimensions on line once you know the bolt size – I don’t recall what it is right off hand. Once the bolt has a drilled hole use gentle heat and tapping on the side of any exposed bolt material to try to collapse it just a bit. It may then be possible to loosen the bolt. Chances are it is rusted in only the first couple of threads in from the surface.
Last edited by third coast; 09-30-2019 at 02:21 PM.
#105
CF Veteran
Joined: Nov 2015
Posts: 2,806
Likes: 180
From: syracuse ny
Year: 1997
Model: Grand Cherokee (ZJ)
Engine: 4.0, new lifters valve job with new springs and exhaust valves, preload set with shims
There's something to grip but it's not turning. He tried one of those extractor sockets and it wouldn't grip. We have a tap and die kit and my partner is planning on trying to do it today. He's nervous as heck about using power tools on the head, and I don't blame him.