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Engine Rebuild
#1
Hey Guys,

Just looking for some advice. I replaced the keyway on the crankshaft and now I can't get the harmonic balancer on. Should I file the keyway down? Its way too tight.

Thanks

D. Rolls

Chasing Rust
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#2
Hey Darren. When I was re-installing the Harmonic Balancer after the rebuild, it seemed like I had to crank that sucker down forever. I wouldn't think about shaving anything until it seems like you're pulling the crankshaft out as you snug it in. Post back here at that time and we'll see where you're at.

Doc

[Image: 6y14ea.jpg]

Project started 8-7-10
Completed: All new suspension, rebuilt 351C H Code bored .030 over with mild cam and intake, new 3.50 TracLok, custom exhaust system
Current "mini-project": interior upgrade Undecided
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#3
73vertproject;126740 Wrote:Hey Darren. When I was re-installing the Harmonic Balancer after the rebuild, it seemed like I had to crank that sucker down forever. I wouldn't think about shaving anything until it seems like you're pulling the crankshaft out as you snug it in. Post back here at that time and we'll see where you're at.

I cant even catch any threads at this point. I gently tapped with a rubber mallet but I think this may not be a good idea so I really don't want to take that approach.

Thanks

Chasing Rust
  Reply
#4
Darren 72;126747 Wrote:
73vertproject;126740 Wrote:Hey Darren. When I was re-installing the Harmonic Balancer after the rebuild, it seemed like I had to crank that sucker down forever. I wouldn't think about shaving anything until it seems like you're pulling the crankshaft out as you snug it in. Post back here at that time and we'll see where you're at.

I cant even catch any threads at this point. I gently tapped with a rubber mallet but I think this may not be a good idea so I really don't want to take that approach.

Thanks

OK. I'm trying to envision what you've got but it seems strange. I'll look for others to post up with a better memory than mine. Confused

Doc

[Image: 6y14ea.jpg]

Project started 8-7-10
Completed: All new suspension, rebuilt 351C H Code bored .030 over with mild cam and intake, new 3.50 TracLok, custom exhaust system
Current "mini-project": interior upgrade Undecided
  Reply
#5
Did you try heating up the harmonic balancer?

I boiled mine in a pot for 30 mins.
Using gloves put it back and tighten per the torque specs.

It worked for me.
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#6
Did you tilt the key just slightly down in the front so the balancer starts?
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#7
caspianwendell;126791 Wrote:Did you tilt the key just slightly down in the front so the balancer starts?

Yes. It starts but only goes 1/2 way on. I may try the heating trick. I will also measure the keyway and the slot in the balancer and check height of the keyway.

Thanks

Chasing Rust
  Reply
#8
The balancer is a slight press fit. It requires a longer bolt or a balancer install tool to get it on properly. I would be hesitant to use heat with the rubber ring in there you do not want the rubber to delaminate.

Jeff T.

Low buck, touring style, '73 Convertible "rolling restoration", 351c, 2v heads with a shave and a haircut, Performer intake, Holley 650(ish), roller rockers, screw in studs, guideplates, stainless valves, Duraspark / Motorsports MSD, T-5 conversion. 1-1/8" front, 3/4" rear swaybars KYB shocks and some home brewed subframe connectors. Future plans; JGC steering box, Cobra brakes and... paint, interior, etc.

When I die I want to die like grandpa, peacefully in my sleep... not screaming, like his passenger.

[Image: 1_12_09_14_10_15_11.png]
  Reply
#9
droptop73;127232 Wrote:The balancer is a slight press fit. It requires a longer bolt or a balancer install tool to get it on properly. I would be hesitant to use heat with the rubber ring in there you do not want the rubber to delaminate.

I don't think heat would work anyway...it would make the key slot tighter as well. Sounds to me like the key is either the wrong size or misaligned. As for the longer bolt...I have done that but stripped the threads inside the crank so DO NOT try to press it on with the crank bolt. use a block of wood and BFH with the bolt pulling it in at the same time. Don't hit it on the outside, and don't hit it hard or you will damage the thrust bearing.
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#10
Or try and rent a harmonic balancer installation tool..
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