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Old 10-10-2011, 12:32 AM   #1
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Default 90' xj 4.0 Harmonic balancer

Can someone please help me clarify if replacing the harmonic balancer will effect the timing in anyway? The rubber from the balancer is pooping out of the crank pulley. I wanted to know if its a straight forward as remove and replace or do you have to worry about timing etc.... The crank pulley/timing chain has never been altered with but I'd like to replace the harmonic balancer if it can just be removed and replaced. I've attached a pic. You can see the fan does contact the rubber from the balancer but its not horrible. I have a taurus fan i was planning to use to replace the mechanical fan anyhow but need to know about the balancer.
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Old 10-10-2011, 12:45 AM   #2
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No need to worry about engine timing.
Just unbolt the old one, and bolt on a new one.......
You might have to figure out how to keep the engine from spinning over while trying to loosen/tighten the crankshaft bolt. Some of them require quite a bit of torque.
Also, maybe think about replacing the front crank seal while you got the balancer off. They are relatively cheap.
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Old 10-10-2011, 01:37 AM   #3
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If I am not mistaken,,

most all engines have the harmonic balance "keyed" (i.e. a slot milled into the cylindrical opening which goes over the crankshaft end)

And will prevent you from installing it incorrectly.


course I been drinkin' and who knows!

Anyway, R & R my man, make sure you use the right puller to take it off...if you don't you can muck up the crankshaft end where the holddown bolt goes...

googd luck!

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Old 10-10-2011, 02:44 AM   #4
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Agree/\, Agree/\, Agree/\, (and I'm on Cheddar cheese). On that 90 you might want to replace that timing cover seal while you're in there. The puller is the same as a steering wheel puller. Very cheap to rent. Do be careful not to muck up any threads. They saw you coming and hid the cam timing business where you can't mess it up. A trick you won't need, if there is a groove in the replacement pulley you can put a spacer under where the seal goes home so the seal, lip rides on a new spot. If you put it all together with the belt on first, so you can finish tightening the bolt later with the belt helping to keep it from rotating, don't forget to come back and tighten the bolt like I did once.
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87-90 Renix jeep owners. This is a link to great info! http://www.cherokeeforum.com/f23/tes...itings-136452/
The book's wrong! #1 is at 5:00, viewed from the side. 153624 clockwise.
I RECOMMEND 280 155 746 INJECTORS, FOR YOUR 87-90 JEEP. 4 holes are better than one, and they won't leak out the middle, like originals CAN.
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Old 10-10-2011, 05:52 PM   #5
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Quote:
Originally Posted by Firehawk068 View Post
Also, maybe think about replacing the front crank seal while you got the balancer off. They are relatively cheap.

I'm searching for the oem front crank seal but can't find it. Do you have a part number?

I searched Mopar parts and this is coming up: Front crank seal, jeep - 2.5l - 2.5L
84-91 $8.00
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Old 10-10-2011, 10:40 PM   #6
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Your local parts store might have it separately, or it would be in a "timing cover gasket set". "Timing cover seal" would be it. rockauto comes up allot.
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87-90 Renix jeep owners. This is a link to great info! http://www.cherokeeforum.com/f23/tes...itings-136452/
The book's wrong! #1 is at 5:00, viewed from the side. 153624 clockwise.
I RECOMMEND 280 155 746 INJECTORS, FOR YOUR 87-90 JEEP. 4 holes are better than one, and they won't leak out the middle, like originals CAN.
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Old 10-10-2011, 11:41 PM   #7
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Front Crank Seal, or (Timing Cover Seal)
Timken part number 321460 Costs $9.99 here in Denver.
Get the whole Timing Cover Gasket set
Fel-Pro part number TCS45117 also costs $9.99 here in Denver
Comes with the Timing Cover Seal, plus you'll get a couple gaskets you might use some day.
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