cj5 harmonic balancer bolt broken? - JeepForum.com
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post #1 of 20 Old 06-20-2021, 08:52 PM Thread Starter
sargas3
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cj5 harmonic balancer bolt broken?

So I bought this CJ5 A few months ago and ive been getting it road ready. I am in the process of putting in an HEI distributor and was trying to put the motor (4.2) in TDC but when I put the socket I cant feel a bolt. If it broken or is this something different. I cant seem to find a tool that I can turn the motor with that fits the normal harmonic. So did I miss something or have I just found a big problem? Please see the pics. FYI the sides of this stud feel smooth to the touch and the balancer is in all the way with no issues when its running. Please let me know what you think . Thanks!

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post #2 of 20 Old 06-20-2021, 10:18 PM
80cj
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Looks like the bolt head sheared off. It's a 1/2" x 20 bolt and takes a 3/4" wrench. Maybe you can use one of those bolt extractor sockets that bites into the bolt as you turn CCW.
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post #3 of 20 Old 06-20-2021, 10:23 PM
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One of these things.
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post #4 of 20 Old 06-21-2021, 07:24 AM Thread Starter
sargas3
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Thank you for the reply. I was afraid that this might be the case. ill pick up that extractor and give it a try. Is this common? I've never seen it before on other vehicles but I have not owned a CJ before. I'm surprised that the balancer is not loose since the bolt is broken. Maybe it was just pressed in there really good. thank you again!
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post #5 of 20 Old 06-22-2021, 10:47 AM
80cj
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Yes, the balancer is normally a pretty snug fit on the crank snout.
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post #6 of 20 Old 06-22-2021, 10:51 AM
Techlight
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Once you get it out you might consider chasing the threads with a tap...looks like someone cross threaded it and then over torqued it as it bound up. Doesn't look like it's all the way in.
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post #7 of 20 Old 06-22-2021, 12:02 PM
pedal2themetai
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HI Make sure the extractor is going to fit the bolt that's left .. With out the head you can or should be able to pull off the harmonic balancer the head with its washer is what holds it on.. Also unless it is bottomed out it should come out fairly easy shouldn't be any pressure on it..
if you get the balancer off you should also be able to weld a nut on the end and screw it out.

good luck
tim
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post #8 of 20 Old 06-22-2021, 07:14 PM Thread Starter
sargas3
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thanks for the responses I ordered a kit with several the extractors like the one above. Ill try and get the balancer off like you said. All this because I wanted to put an HEI in it. Well I guess its better I find out now than later on down the road. Ill let you all know how it goes.
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post #9 of 20 Old 06-22-2021, 08:12 PM Thread Starter
sargas3
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additional question. I am having a hard time finding the replacement bolt. does anyone know the part number?
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post #10 of 20 Old 06-22-2021, 08:20 PM
80cj
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When you reinstall the balancer, try to get a long threaded bolt or rod . I used an old 1/2x20 spring centerbolt . Screw it into the crank as far in as it will go then use a nut and heavy washer to force the balance home. The point is to not take any chance of messing up the crank threads by using a bolt to force the balancer in place.
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post #11 of 20 Old 06-22-2021, 08:24 PM
80cj
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Quote:
Originally Posted by sargas3 View Post
additional question. I am having a hard time finding the replacement bolt. does anyone know the part number?
Not sure about the length but probably when you get the old one out you can measure and decide on the length. I do know that it's a 1/2x20 grade 8.
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post #12 of 20 Old 06-22-2021, 09:04 PM
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Quote:
Originally Posted by sargas3 View Post
additional question. I am having a hard time finding the replacement bolt. does anyone know the part number?
I used Mr. Gasket 7846. worked out well.

As pedal2themetai and 80cj says the bolt and washer keep the balancer along with a press fit. You should be able to use a puller and get the balancer off and out of the way and have an easier time removing the broken bolt.
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post #13 of 20 Old 06-22-2021, 10:19 PM
pedal2themetai
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HI, when removing the balancer be sure not to lose the key that lines up the balancer.
good luck
tim
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post #14 of 20 Old 06-22-2021, 10:59 PM
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I think I would try and remove the bolt without removing the balancer. It does not look like the balancer is in the way and you might be inviting other problems. I would start soaking it with a good penetrating oil. It was probably a weak bolt that just popped the head off. It does not look like anyone ever tried to remove it so I bet the person what had the Jeep or built the motor did not know it had broken. I cannot see anyone knowing about that problem and not at least trying to remove and replace the bolt.

If the extractor does not work, get someone to weld a nut on it. The heat from welding helps it come loose but you do not want to overheat the area or you will kill your crank seal. As said above, I bet it comes right out unless it is cross threaded.

A simple pair of long nosed Vice Grips might be able to get it out.
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post #15 of 20 Old 06-28-2021, 05:33 PM Thread Starter
sargas3
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Quote:
Originally Posted by StoneTower View Post
I think I would try and remove the bolt without removing the balancer. It does not look like the balancer is in the way and you might be inviting other problems. I would start soaking it with a good penetrating oil. It was probably a weak bolt that just popped the head off. It does not look like anyone ever tried to remove it so I bet the person what had the Jeep or built the motor did not know it had broken. I cannot see anyone knowing about that problem and not at least trying to remove and replace the bolt.

If the extractor does not work, get someone to weld a nut on it. The heat from welding helps it come loose but you do not want to overheat the area or you will kill your crank seal. As said above, I bet it comes right out unless it is cross threaded.

A simple pair of long nosed Vice Grips might be able to get it out.
I was able to get it out without removing the balancer! it came out easy but you will see why if you look at the pics. no idea what this is but the number on it says pat171513. im waiting for the part Mr. Gasket 7846 cjoffroad suggested to come in. For some reason that part is not in anyone's computers for the oem so thank you for telling which one to buy. Thanks for all the help! hopefully ill have it back together by this weekend.
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