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XJ Ask the Question Thread
No, I don't lick fish.



Joined: Mar 2011
Posts: 11,169
Likes: 26
From: Northern Kentucky
Year: 1999
Model: Cherokee (XJ)
Engine: 4.0
Member
Joined: May 2010
Posts: 223
Likes: 0
From: upstate, New York
Year: 1988
Model: Cherokee
Engine: 1991 I6 4.0 HO
::CF Moderator::
Joined: Aug 2011
Posts: 43,971
Likes: 1,578
From: Prescott, Az
Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
::CF Moderator::
Joined: Aug 2011
Posts: 43,971
Likes: 1,578
From: Prescott, Az
Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
No, I don't lick fish.



Joined: Mar 2011
Posts: 11,169
Likes: 26
From: Northern Kentucky
Year: 1999
Model: Cherokee (XJ)
Engine: 4.0
So I used a borescope to inspect the number one cylinder on my 4.0.
-the quench chamber/ head gasket area. (I don't know if that's the proper term for it) it's looking crusty yellow. Is that normal?
-the gap around the piston and the cylinder wall is not the same. There's a spot on the piston that got bigger gap than the rest of the piston and that gap have yellow stuff on it.
-the dish on the piston look gray and brown with a spot that look like when you get a sun burn and your skin start peeling off. There's also a line on it. Not sure if that's normal or it's a crack.
-one of the valves look very yellow/white while the other valve look very brown.
-I don't see any visible scoring marks on the wall but I did notice very very faint black line, not sure if that's a scoring mark or just a carbon smear.
-the quench chamber/ head gasket area. (I don't know if that's the proper term for it) it's looking crusty yellow. Is that normal?
-the gap around the piston and the cylinder wall is not the same. There's a spot on the piston that got bigger gap than the rest of the piston and that gap have yellow stuff on it.
-the dish on the piston look gray and brown with a spot that look like when you get a sun burn and your skin start peeling off. There's also a line on it. Not sure if that's normal or it's a crack.
-one of the valves look very yellow/white while the other valve look very brown.
-I don't see any visible scoring marks on the wall but I did notice very very faint black line, not sure if that's a scoring mark or just a carbon smear.
::CF Moderator::
Joined: Aug 2011
Posts: 43,971
Likes: 1,578
From: Prescott, Az
Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
::CF Moderator::
Joined: Aug 2011
Posts: 43,971
Likes: 1,578
From: Prescott, Az
Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
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Yeah I know pics suck
Yeah I know pics suck











