Removing a harmonic balancer bolt on a Buick 3800 V6
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Uploader Comments (moldymac)
Top Comments
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thats great for the starter.
3 years ago 7
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Anybody who doesn't know which way your engine turns, crank it first, and if the harmonic balancer goes clockwise, you are good to go with this trick. It shouldn't ruin your starter if it's just a few clicks to get it loosened. I've already saved over a thousand dollars just by watching these DIY vids for replacing inline fuel filter, breaks, serpentine, spark plugs and wires, and wheel alignment just to name a few things I did on my truck.
All Comments (35)
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@GammaRays134 I will try to find those bolts tomorrow I will let you know what happens.
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@moldymac They are 1/4x28
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@1southcide Get 3, 4" long 1/4x28 bolts, with some heavy washers and use the standard three-hole-type puller. works like a charm, Be sure to thread the bolts in well and evenly, and use oil on the threads
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what size breaker bar did you use...I have a 1994 Buick Park Avenue 3800 tuned port injection...I need to get the harmonic balancer off to replace the Crankshaft Position Sensor.
1southcide 3 weeks ago
@1southcide its a 1/2" drive Craftsman breaker bar, not sure how long.
moldymac 2 weeks ago
@moldymac ok thanks..I got the bolt out but i'm still having trouble with the HB the puller that I rented from autozon dosent have the correct size bolts I think they are M6 I found some but they are not long I could really use some help on how to get the stubborn HB off fast.
1southcide 2 weeks ago
@1southcide It's been a while since I did this on a newer 3800 that used bolts (the one in the video didn't require a puller). I think they were 1/4-20 bolts, but could be wrong. Make sure you buy grade 8 bolts, these things have a tendency to snap regular bolts.
moldymac 2 weeks ago
@1southcide I just checked my parts engine, its definitly not 1/4-20. The bolts that thread into it are a real fine thread that look close to 1/4-20, maybe 1/4-28 or metric. I bought 4" bolts when I did this on my riviera and they were too long, hit the frame and made it hard to remove.
moldymac 2 weeks ago
It's 3:00 AM and this trick worked like a charm. I disconnected the plug wires, marked the top of the pulley and gave it a short crank to see which way it spins. "Clockwise," on this 3.8L GM.
Then I braced a 1/2" drive rachet with a 15/16ths socket against the frame like in this video, carefully cranked the motor a couple of times, and the bolt loosened, just like in the movies.
The trick is -- don't overdo it. Easy clicks on the starter until it breaks.
Thanks, moldymac.
billo321 2 months ago
@billo321 Glad I could help!
moldymac 2 months ago