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  #1  
Old February 5th, 2018, 02:36 PM
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Torquing 5.0 Harmonic Balancer Bolt

In repairing another timing cover coolant leak on my '91 LSC, I removed the HB bolt with a impact wrench. Last time I did the job I used the impact wrench to r & r the bolt and have never had a problem.

Now I'm reading that you shouldn't do this due to possible crank damage. How do you guys keep the engine from turning while torquing the bolt or do you just go with the impact tool?

FYI, torque is 90 ft. Lbs.
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Last edited by Jud149; February 5th, 2018 at 02:52 PM.
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Old February 5th, 2018, 03:20 PM
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Not sure what the HB looks like on one of these, but the way I approached it on my 67 recently was to use the curved end of a flat pry bar in one of the openings of the HB and push opposite direction of the way you are torquing the bolt. Worked OK for me. I generally do not use a windy gun on anything if I can avoid it.
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Old February 5th, 2018, 04:29 PM
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Exactly the balancer your 87 had. I use an impact gun set to low torque. I suppose a better way would be to make a bar that bolts to 2 of the crank pulley holes as a holding tool.
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Old February 5th, 2018, 09:12 PM
W.V. Kelly W.V. Kelly is offline
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It's been a while but I seem to recall bolting up the crank pulley and using an old serpentine belt as a kind of strap wrench. Definitely no impact tool.
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Old February 6th, 2018, 09:04 AM
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Are you using a harmonic balancer installer?
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Old February 6th, 2018, 12:44 PM
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Quote:
Originally Posted by padroo View Post
Are you using a harmonic balancer installer?
Yep, although didn't last go round.
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Old March 25th, 2018, 09:25 PM
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Install Update:

Found simple way to torque it. Screwed 2, 3 slash bolts into the balancer where the pulley bolts on (didn't use the pulley bolts as didn't want to chance damaging them.) Screwed them in as far as possible. Used the 2 holes nearest each other to allow pry bar to be inserted between them, for opposite leverage of that of torquing, w/o interfering with the torque wrench. Then properly set the torque at 70 ft lbs. Very simple. Took less than a minute.

Obviously this method could be used to remove the main balancer bolt also, eliminating using an impact wrench which many say could possibly damage the crank.
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Last edited by Jud149; March 25th, 2018 at 09:34 PM.
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Old March 26th, 2018, 10:23 AM
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Quote:
Originally Posted by Jud149 View Post
Install Update:

Found simple way to torque it. Screwed 2, 3 slash bolts into the balancer where the pulley bolts on (didn't use the pulley bolts as didn't want to chance damaging them.) Screwed them in as far as possible. Used the 2 holes nearest each other to allow pry bar to be inserted between them, for opposite leverage of that of torquing, w/o interfering with the torque wrench. Then properly set the torque at 70 ft lbs. Very simple. Took less than a minute.

Obviously this method could be used to remove the main balancer bolt also, eliminating using an impact wrench which many say could possibly damage the crank.
I like it.
I'll use this strategy very soon.
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