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Old 03-31-2007, 04:38   #1 (permalink)
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Question Big problem, stumped on how to fix!

ok here is what is goin on, the car started to slowly lose power over a 6 month period, even started to sound like it was knocking, took to 3 dif gargage and was told it was just getting old and was and escort(i took this very offensely, lol) but the car just rolled to 100,000 miles and i have always taken great care of it. well one day in traffic it stalled and watched the harmonic ballancer shoot out and roll down the street, that sucked, well after i got her home and got lookin at it i found what the problem was this whole time, the bolt on the HB(harmonic ballancer) had loosened up and was allowing the pully to move slighly back and forth, well over the course of 6-8 months it finnaly wore the keyway key out, and stripped the crank treads out, allowing the pully to pass me in traffic, lol. so now i don't know what to do for the life of me, got a new HB and Key but it also wore the keyway slot on the crank out, it alows the keyway key to move alittle, so i know it will cause the same thing again over time. ok here are the questions:

1. can i replace the crank with out fully removing the engine from the car?(i have done some heads and rod bearings so i am able to do it if it can be done.)

2. what kind of tap would i use to tap out the crank tread, being it's hardened steal.

3. could i drill a hole in the HB into the crank directly next to the bolt holding it on, and tap and tread that bolt so the pully can't move?

4. i will be replacing the water pump and timing belt before putting this back together, so know it's the wrong way to do it, could i weld the pully on? i know the crank is hardened steal and the pully is not so they are def dislike metals,so welding the pully right to the crank is not an option, but what if i got a piece of hardened steal treaded bolt and cut the head off , put it on the crank tread bolt hole, weld into place and then put a nut on the treads instead of the bolt that will not hold in the treads any more?

5. any other ideas???? :(


thank you guys so much for even looking at this, anything will be helpfull i hate to junk this car a get a new motor for a darn simple little thing like this. sorry for my spelling and typing errors i have been up for 36 hours at work.
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Old 03-31-2007, 21:41   #2 (permalink)
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Re: Big problem, stumped on how to fix!

any ideas?? oh it's a 98 escort 2.0l sohc
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Old 04-01-2007, 21:52   #3 (permalink)
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Re: Big problem, stumped on how to fix!

They make a thing called a Heli coil. It is a thread repair device that is screwed into the damaged threads. Another option would be a cold weld. Or J-B weld. Its a two part epoxy made for metal repairs. You would need to get some brake cleaner or electrical cleaner to make sure the hole in the crank was totally free of dirt or grease. Same goes for the bolt that holds it on.

Clean everything up and install the balancer where it goes, mix up a good amount of cold weld and slop it on the bolt and inside the crank hole. Thread the bolt into the crank and let it dry overnight. This stuff gets a bad wrap, but it actually works pretty good for some applications. Most of the trouble I think people have with it is oily or rusty parts. It will not work if its not clean bare metal.

You wont be able to pull the crank out of that car without pulling the engine. Well, lets say it would be easier to pull the engine. A machine shop could fix it easily enough, but it would have to be out for them to work on it. I wouldnt weld on it with an electric welder.

At least with the cold weld you have a chance to remove the harmonic balancer later if you decide on a rebuild. And the last option you have is the hope that there are some threads still in the crank that have never been used. The crank is normally tapped with more threads than the bolt uses. By finding a longer bolt you may be able to install it normally.

Measure the depth of the hole in the crank against the bolt length and see what you have. If that works...clean it up really good with the forementioned brake cleaner and apply some Loctite (BLUE) to the bolt prior to tightening it down. This should keep it from coming loose.
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