Time for a new engine?
Thread Starter
Junior Member
Joined: Feb 2011
Posts: 47
Likes: 0
From: Orlando
Year: 1998
Model: Cherokee
Engine: 5.0
CF Veteran
Joined: Mar 2010
Posts: 47,923
Likes: 38
From: Broward County Fl.
Year: 1989 xj sport 2dr
Model: Cherokee
Engine: 12 hole bosch Injectors
CF Veteran
Joined: Aug 2010
Posts: 1,168
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From: Williamsport, Pa
Year: 1997
Model: Cherokee
Engine: 4.0L
I don't remember if I saw that you posted the vehicle mileage... how many mile do you think is on the Jeep? How long have you owned it? How long do you plan on keeping it?
I would start with a compression test- this can point you in the right direction- low compression and you could start to rule out the oil pump. Decent compression could rule out cracked heads and possibly bad rings.
High temps could mean two thing (one or both)- poor cooling due to cooling system problems, or friction caused by poor oil circulation.
The problem with a yard motor is you just never know what you're going to get- unless you tear it apart and inspect every part of it. So if you plan on keeping the vehicle for a long time I would invest in rebuilding your motor or purchase a new (Jasper or other). If you think you'll get rid of the Jeep in the next year or two I would monitor the oil level routinely and just drive it. My Jeep had low oil pressure and a bad knock for the last 25K miles I owned it- and it's new owner is still beating the crap out of it, with no rebuild. Just food for thought
I would start with a compression test- this can point you in the right direction- low compression and you could start to rule out the oil pump. Decent compression could rule out cracked heads and possibly bad rings.
High temps could mean two thing (one or both)- poor cooling due to cooling system problems, or friction caused by poor oil circulation.
The problem with a yard motor is you just never know what you're going to get- unless you tear it apart and inspect every part of it. So if you plan on keeping the vehicle for a long time I would invest in rebuilding your motor or purchase a new (Jasper or other). If you think you'll get rid of the Jeep in the next year or two I would monitor the oil level routinely and just drive it. My Jeep had low oil pressure and a bad knock for the last 25K miles I owned it- and it's new owner is still beating the crap out of it, with no rebuild. Just food for thought
Thread Starter
Junior Member
Joined: Feb 2011
Posts: 47
Likes: 0
From: Orlando
Year: 1998
Model: Cherokee
Engine: 5.0
Before the engine warms up the pressure is right in the middle of normal. After the engine warms up the idling oil pressure will drop to about 15, sometimes to 10. Has not gone to zero, and warning light has not been activated.
Thread Starter
Junior Member
Joined: Feb 2011
Posts: 47
Likes: 0
From: Orlando
Year: 1998
Model: Cherokee
Engine: 5.0
I don't remember if I saw that you posted the vehicle mileage... how many mile do you think is on the Jeep? How long have you owned it? How long do you plan on keeping it?
I would start with a compression test- this can point you in the right direction- low compression and you could start to rule out the oil pump. Decent compression could rule out cracked heads and possibly bad rings.
High temps could mean two thing (one or both)- poor cooling due to cooling system problems, or friction caused by poor oil circulation.
The problem with a yard motor is you just never know what you're going to get- unless you tear it apart and inspect every part of it. So if you plan on keeping the vehicle for a long time I would invest in rebuilding your motor or purchase a new (Jasper or other). If you think you'll get rid of the Jeep in the next year or two I would monitor the oil level routinely and just drive it. My Jeep had low oil pressure and a bad knock for the last 25K miles I owned it- and it's new owner is still beating the crap out of it, with no rebuild. Just food for thought
I would start with a compression test- this can point you in the right direction- low compression and you could start to rule out the oil pump. Decent compression could rule out cracked heads and possibly bad rings.
High temps could mean two thing (one or both)- poor cooling due to cooling system problems, or friction caused by poor oil circulation.
The problem with a yard motor is you just never know what you're going to get- unless you tear it apart and inspect every part of it. So if you plan on keeping the vehicle for a long time I would invest in rebuilding your motor or purchase a new (Jasper or other). If you think you'll get rid of the Jeep in the next year or two I would monitor the oil level routinely and just drive it. My Jeep had low oil pressure and a bad knock for the last 25K miles I owned it- and it's new owner is still beating the crap out of it, with no rebuild. Just food for thought
Thread Starter
Junior Member
Joined: Feb 2011
Posts: 47
Likes: 0
From: Orlando
Year: 1998
Model: Cherokee
Engine: 5.0
Thread Starter
Junior Member
Joined: Feb 2011
Posts: 47
Likes: 0
From: Orlando
Year: 1998
Model: Cherokee
Engine: 5.0
I don't remember if I saw that you posted the vehicle mileage... how many mile do you think is on the Jeep? How long have you owned it? How long do you plan on keeping it?
I would start with a compression test- this can point you in the right direction- low compression and you could start to rule out the oil pump. Decent compression could rule out cracked heads and possibly bad rings.
High temps could mean two thing (one or both)- poor cooling due to cooling system problems, or friction caused by poor oil circulation.
The problem with a yard motor is you just never know what you're going to get- unless you tear it apart and inspect every part of it. So if you plan on keeping the vehicle for a long time I would invest in rebuilding your motor or purchase a new (Jasper or other). If you think you'll get rid of the Jeep in the next year or two I would monitor the oil level routinely and just drive it. My Jeep had low oil pressure and a bad knock for the last 25K miles I owned it- and it's new owner is still beating the crap out of it, with no rebuild. Just food for thought
I would start with a compression test- this can point you in the right direction- low compression and you could start to rule out the oil pump. Decent compression could rule out cracked heads and possibly bad rings.
High temps could mean two thing (one or both)- poor cooling due to cooling system problems, or friction caused by poor oil circulation.
The problem with a yard motor is you just never know what you're going to get- unless you tear it apart and inspect every part of it. So if you plan on keeping the vehicle for a long time I would invest in rebuilding your motor or purchase a new (Jasper or other). If you think you'll get rid of the Jeep in the next year or two I would monitor the oil level routinely and just drive it. My Jeep had low oil pressure and a bad knock for the last 25K miles I owned it- and it's new owner is still beating the crap out of it, with no rebuild. Just food for thought