C1 threading crankshaft for dampener

[Gary O.]

I just got my engine back from a rebuild and the machine shop forgot to drill the end of the crank for a bolt to hold the dampener on. Does anyone know if it is possible to drill the crank with the engine assembled.

[Gene M.]

Re: C1 threading crankshaft for dampener

Gary,
If you have a low horse power engine it is not correct to have threaded crank. Judges will catch this error. But if you are substituting a low horse crank in a high horse motor then it needs to be drilled and threaded prior to assembly. Cranks are hardened and thread needs to be straight and concentric.

[Tom Wander]

Re: C1 threading crankshaft for dampener

I drilled and threaded mine with the engine and radiator in the car. I used a small air-powered drill. It was tight working conditions but the crank is relatively soft material so the drilling and tapping is not difficult. It should be a piece of cake with engine out of the car.

[Mark B.]

Re: C1 threading crankshaft for dampener

Gary,

I performed the drilling and tapping of my crankshaft snout recently on my 59 with the engine in the car. I have some detailed instructions that I can email to you if needed. Basically, I used a right angle air drill, 3 drill bits, a drill tap, a bolt kit from Summit Racing, and 3 nights worth of patience and sore arms. Email me if you want the directions. m.mbrennan@verizon.net

[Terry D.]

Re: C1 threading crankshaft for dampener

Gary
If the motor is still out of the car, this is a simple procedure. I made a guide for my drill out of 2x4's to keep it straight. That way I only had to drill one time and then make the threads. Buy a "good" drill bit to do this, the extra money spent will save a ton of time.
Terry