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Old 08-14-2022, 02:02 PM   #1
mr_camera_man
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Default 420 tips for drilling crankshaft?

Working on a 420 going into a G9. Planning to drill / tap for 1/2x20 to use the existing clutch bolt. Got to the part where I drilled out the existing threads in the new engine, planning to drill deeper using the old hole as a guide, and then just came to a dead stop when I hit solid steel at the bottom of the existing hole. I haven't cut the crank yet, because I'd rather keep the old hole as a guide unless I have no choice.

What's the trick... drill a smaller hole first? But then, using what as a guide to keep it centered? Or suck it up and spend $$$ at a machine shop?
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Old 08-19-2022, 01:32 PM   #2
slonomo
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Default Re: 420 tips for drilling crankshaft?

I used small bits and graduated to large using taping oil. No issues. I cut my crank first.
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Old 08-19-2022, 02:01 PM   #3
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Default Re: 420 tips for drilling crankshaft?

A real carbide drill bit? With slow speed, lots of pressure and plenty of oil.
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Old 08-19-2022, 05:26 PM   #4
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Default Re: 420 tips for drilling crankshaft?

Cranks are relatively easy to machine/drill. I've done a few over the years for retaining bolts. KEEP the existing hole as a pilot unless you are drilling this on a mill or drill press, and even then. The only reason that a decent drill wouldn't do the job is if it encountered an inclusion, not unheard of in china iron.
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Old 08-19-2022, 11:27 PM   #5
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Default Re: 420 tips for drilling crankshaft?

Do you guys drill out the hole with a drill while the crank is still in the engine? Or, do you remove the crank and drill it out on a drill press?
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Old 08-20-2022, 08:05 AM   #6
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Default Re: 420 tips for drilling crankshaft?

I'd just bolt the engine to an angle plate and clamp/bolt the plate to the drill press. Add something to stop the crank from turning, and Bob's your uncle.
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Old 08-20-2022, 08:01 PM   #7
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Default Re: 420 tips for drilling crankshaft?

[QUOTE and Bob's your uncle. [/QUOTE]

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Old 08-20-2022, 08:52 PM   #8
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Default Re: 420 tips for drilling crankshaft?

I always thought it was "Mums your uncle"
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Old 08-28-2022, 10:50 AM   #9
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Default Re: 420 tips for drilling crankshaft?

Thanks everyone. I didn't want to cut the crank first, since I wanted to use the old hole as a guide to help me stay on center. Several carbide drill bits, lots of oil and a sore elbow later, and I'm done. Cut, drilled, and tapped.
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