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This can be quite a job depending on the year of the vehicle. If it's an older vehicle things are a lot easier.
Basically, you have to remove everything from the front of the engine so you can get at the harmonic balancer. If you are real lucky you may get by with just removing all the belts. On some vehicles you can get at the harmonic balancer from underneath the car or truck. One way or the other, you have to be able to get at the harmonic balancer. There is a 5/8" bolt in the middle of the balancer. Remove it and use a harmonic balancer puller to remove the balancer. At this point you can see the seal that the snout of the balancer went through. You need a seal removal tool to get the old seal out. Most rental places will have both the harmonic balancer puller and the seal removal tool if you don't. Get the old seal out. Now, take the new seal out of it's package and use a little motor oil on your finger to lube the rubber on the new seal. Put the new seal in using a hammer to tap it into place. This can be a little easier said than done sometimes. Use care not to damage the new seal. Try to get it lined up evenly and just tap it in a circular pattern to get it started. Once you have the new seal in... take a look at the snout of the harmonic balancer and make sure there is not a groove in it from the old seal. If there is one, head to your local auto parts store and grab a harmonic balancer repair sleeve. If all is well you need to use the balancer tool to put the balancer back on. Most balancer tools double as a remover and installer. Make sure you have the key on the crankshaft snout and the groove in the balancer lined up. Once you have the balancer back in place put the 5/8" bolt and washer back in. Use a torque wrench and tighten it to factory specs. If my memory serves me correctly it's 65 ft. lbs. on a chevy. But don't rely on my memory. Now just put everything back on the engine and you're back on the road.
This may be a job for a mechanic if you have never done anything like this before. But, it's an expensive job. It's also a good learning experience to do it yourself and save several hundred bucks. The seal itself should be under $20.00 Take pictures of the front of the engine as you remove things. Better yet, get a buddy to video record as you go. It will be a big help when it comes to putting it back together. Also, label everything you can. It's usually a lot harder putting back together than it was taking apart. I would plan on making a weekend of it.
Good luck,
Guy
Wiki User
∙ 15y ago
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