Crank seal replace - 90 Cherokee
I'm looking to replace the rear crankshaft seal on a 90 XJ 4.0. Anyone
ever done one of these? It doesn't look too complicated (this is what I've said with almost every repair I've ever undertaken!!!). Anything in particular to watch for? TIA JB |
Re: Crank seal replace - 90 Cherokee
Yup, the leak from the valve cover that is pretending to be a rear crank
seal leak.... These engines are tilted back and the valve covers tend to leak. This runs right down a grove in the back and drips off the bell housing bottom or oil pan. To test, run the engine for a bit, then take a clean rag and wipe the head below the valve cover. If you come up with oil, then I recommend you change this gasket before worrying about the bottom. If the bottom does need fixing, the pan comes off fairly easy, the starter might be in the way. Mike 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00 88 Cherokee 235 BFG AT's jbcrow wrote: > > I'm looking to replace the rear crankshaft seal on a 90 XJ 4.0. Anyone > ever done one of these? It doesn't look too complicated (this is what > I've said with almost every repair I've ever undertaken!!!). Anything > in particular to watch for? > > TIA > JB |
Re: Crank seal replace - 90 Cherokee
Yup, the leak from the valve cover that is pretending to be a rear crank
seal leak.... These engines are tilted back and the valve covers tend to leak. This runs right down a grove in the back and drips off the bell housing bottom or oil pan. To test, run the engine for a bit, then take a clean rag and wipe the head below the valve cover. If you come up with oil, then I recommend you change this gasket before worrying about the bottom. If the bottom does need fixing, the pan comes off fairly easy, the starter might be in the way. Mike 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00 88 Cherokee 235 BFG AT's jbcrow wrote: > > I'm looking to replace the rear crankshaft seal on a 90 XJ 4.0. Anyone > ever done one of these? It doesn't look too complicated (this is what > I've said with almost every repair I've ever undertaken!!!). Anything > in particular to watch for? > > TIA > JB |
Re: Crank seal replace - 90 Cherokee
Yup, the leak from the valve cover that is pretending to be a rear crank
seal leak.... These engines are tilted back and the valve covers tend to leak. This runs right down a grove in the back and drips off the bell housing bottom or oil pan. To test, run the engine for a bit, then take a clean rag and wipe the head below the valve cover. If you come up with oil, then I recommend you change this gasket before worrying about the bottom. If the bottom does need fixing, the pan comes off fairly easy, the starter might be in the way. Mike 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00 88 Cherokee 235 BFG AT's jbcrow wrote: > > I'm looking to replace the rear crankshaft seal on a 90 XJ 4.0. Anyone > ever done one of these? It doesn't look too complicated (this is what > I've said with almost every repair I've ever undertaken!!!). Anything > in particular to watch for? > > TIA > JB |
Re: Crank seal replace - 90 Cherokee
Replacing that seal is an easy job, but it is probably not necessary. The
WAY more common ailment that gives a symptom similar to that is the Valve Cover Gasket. The VCG typically breaks somewhere towards the rear of the motor, and the oil flows out and down the back of the block, into the bell housing, and down to the inspection plate that covers the flywheel or torque converter. It LOOKS for all the world like the rear main has taken a dump, but it is really the VCG. "jbcrow" <jbcrow@flex.com> wrote in message news:ebd4f35d.0402190152.1cfaa180@posting.google.c om... > I'm looking to replace the rear crankshaft seal on a 90 XJ 4.0. Anyone > ever done one of these? It doesn't look too complicated (this is what > I've said with almost every repair I've ever undertaken!!!). Anything > in particular to watch for? > > TIA > JB |
Re: Crank seal replace - 90 Cherokee
Replacing that seal is an easy job, but it is probably not necessary. The
WAY more common ailment that gives a symptom similar to that is the Valve Cover Gasket. The VCG typically breaks somewhere towards the rear of the motor, and the oil flows out and down the back of the block, into the bell housing, and down to the inspection plate that covers the flywheel or torque converter. It LOOKS for all the world like the rear main has taken a dump, but it is really the VCG. "jbcrow" <jbcrow@flex.com> wrote in message news:ebd4f35d.0402190152.1cfaa180@posting.google.c om... > I'm looking to replace the rear crankshaft seal on a 90 XJ 4.0. Anyone > ever done one of these? It doesn't look too complicated (this is what > I've said with almost every repair I've ever undertaken!!!). Anything > in particular to watch for? > > TIA > JB |
Re: Crank seal replace - 90 Cherokee
Replacing that seal is an easy job, but it is probably not necessary. The
WAY more common ailment that gives a symptom similar to that is the Valve Cover Gasket. The VCG typically breaks somewhere towards the rear of the motor, and the oil flows out and down the back of the block, into the bell housing, and down to the inspection plate that covers the flywheel or torque converter. It LOOKS for all the world like the rear main has taken a dump, but it is really the VCG. "jbcrow" <jbcrow@flex.com> wrote in message news:ebd4f35d.0402190152.1cfaa180@posting.google.c om... > I'm looking to replace the rear crankshaft seal on a 90 XJ 4.0. Anyone > ever done one of these? It doesn't look too complicated (this is what > I've said with almost every repair I've ever undertaken!!!). Anything > in particular to watch for? > > TIA > JB |
Re: Crank seal replace - 90 Cherokee
jbcrow@flex.com (jbcrow) wrote in message news:<ebd4f35d.0402190152.1cfaa180@posting.google. com>...
> I'm looking to replace the rear crankshaft seal on a 90 XJ 4.0. Anyone > ever done one of these? It doesn't look too complicated (this is what > I've said with almost every repair I've ever undertaken!!!). Anything > in particular to watch for? > > TIA > JB One other note, this is the real oil seal and I plan on doing this with the engine in the vehicle. Am I overly optimistic about this not being too bad of a job? thanks again, JB |
Re: Crank seal replace - 90 Cherokee
jbcrow@flex.com (jbcrow) wrote in message news:<ebd4f35d.0402190152.1cfaa180@posting.google. com>...
> I'm looking to replace the rear crankshaft seal on a 90 XJ 4.0. Anyone > ever done one of these? It doesn't look too complicated (this is what > I've said with almost every repair I've ever undertaken!!!). Anything > in particular to watch for? > > TIA > JB One other note, this is the real oil seal and I plan on doing this with the engine in the vehicle. Am I overly optimistic about this not being too bad of a job? thanks again, JB |
Re: Crank seal replace - 90 Cherokee
jbcrow@flex.com (jbcrow) wrote in message news:<ebd4f35d.0402190152.1cfaa180@posting.google. com>...
> I'm looking to replace the rear crankshaft seal on a 90 XJ 4.0. Anyone > ever done one of these? It doesn't look too complicated (this is what > I've said with almost every repair I've ever undertaken!!!). Anything > in particular to watch for? > > TIA > JB One other note, this is the real oil seal and I plan on doing this with the engine in the vehicle. Am I overly optimistic about this not being too bad of a job? thanks again, JB |
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