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Can someone tell me how to install the harmonic balancer on a chevy inline six 250 with a crankshaft that doesn't have any threads in the center hole? I rented an install kit from a parts store but it was designed for the threaded center hole.
Thank you for those who take the time to help and provide advice! A classic car enthusiest!
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You can drill the crank for any SB bolt.
Larry/Twisted6 [oooooo] Adding CFM adds boost God doesn't like ugly.
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Dear Royal;
Larry's correct. Be sure it's SAE (fine) threads.
Good luck.
John M., I.I. #3370
"There are no shortcuts to any place worth going". -Anon
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It is not the best thing to do, but it is old school. A block of wood and a big hammer. It helps to heat the balancer and shoot the end of the crank with a freeze-it spray just before install.
Inliner #1916
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Using a air chisel with a blunt tip on a plate bolted on the balancer to drive it on. Any of the blunt force methods can be hard on the thrust bearing. Tom
Inliner Member 1716 65 Chevelle Wagon and 41 Hudson Pickup Information and parts www.12bolt.com
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Dear Tom;
Yes that's true.
However; the Dampner is 3/4 of the way on, (over the key) when the force is needed.
It's only a "couple of licks" to set it on there etc. I usually use my "old school block" as posted.
WD-40 helps as well.
John M., I.I. #3370
"There are no shortcuts to any place worth going". -Anon
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I did use the block and the hammer but I can only get it so far in. I'm affraid to hit it any harder.
Thank you for those who take the time to help and provide advice! A classic car enthusiest!
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Try putting the hub on a hotplate/stove for a couple minutes and slip it on using oven mitts and tap it home with a mallet. Drilling, tapping, and beating can all be avoided and IMO if it was designed to be drawn on Chevrolet engineers would have put a thread there in the first place. Freeze/cold spray works wonders preparing sleeves/bushings for interference fits but will not reduce the diameter of a solid crank any more than a couple tenths and not worth bothering.
1952 Chev 1300 Cdn. ½ ton
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I will try that, thank you.
Thank you for those who take the time to help and provide advice! A classic car enthusiest!
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Get the damper pretty hot, up to 200 or 250 won't hurt it. Set the engine outside for a hour two will help also if its cold out. Get everything ready and shove it on in one quick step and have the hammer and wood ready. Once it stops, even for a second, its sticks. You should be able to get 3/4 or more of the way on if you are quick.
Joe
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Well, I got it in today just doing it with the hammer and wood and after a long hour the damn thing is in. It's not all the way flush with the harmonic balancer but my belt does match up with the alternator. Should it be flush? I probably have a couple of cms left.
Thank you for those who take the time to help and provide advice! A classic car enthusiest!
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Dear Royal;
??what?? "isn't fush" etc.
If you can see the 'shiny' part (where the seal rides) It's not on 'all the way' yet.
I've used the moveable (tubelar) part of an axle stand as a tool to instal these. It makes a different sound, when it hits the crank gear. It's "solid" at that point.
Good luck.
John M., I.I. #3370
"There are no shortcuts to any place worth going". -Anon
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And it certainly should not have taken a "long hour" to accomplish that! I'm thinking the key was the wrong size or too high in its slot. Just a guess though.
Drew Mid-Atlantic Chapter
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While I am not in favor of hammering these things on (drilling and tapping for a bolt is way better) I do understand necessity. I recently pulled a 250 damper and the grease mark shows is was not flush. The end of the crank was recessed about 1/2 inch from the very outside of the dampeners face.
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As my balancer warms up for the install, I did some searching and now I have a question or two.
If I tap the Crankshaft, what bolt size and thread count should I shoot for? I have not owned a V anything in years, so I have no idea the bolt size of a SBC. I also want to make sure I have the tap.
And what size drill bit for the hole that will be tapped?
Thanks for the info.
69 chevy C-10-250, 3x1, offy, t-5 family owned 87 Toyota-4Runner 22REC 87 18'Invader-Volvo AQ131C/275A
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BBC size damper bolt.
MBHD
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And what size drill bit for the hole that will be tapped?
Use a 25/64 drill bit and a 7/16 x 20 tap!
Class III CNC Machinist/Programmer
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The GMC uses a 5/8"-18 and we use the same dampners. A BBC should do it; make sure it is true...Good Luck
216.158 MPH 12-Port 302 GMC on 70% 171.0 MPH 302 stock head on gasoline 7 years later
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Thanks for the reply on the tap and drill bit sizes.
69 chevy C-10-250, 3x1, offy, t-5 family owned 87 Toyota-4Runner 22REC 87 18'Invader-Volvo AQ131C/275A
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