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How to plug crank oil galleys after ball removal

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BogusSVO

10+ Year Contributor
5,891
318
Jul 1, 2009
Pensacola, Florida
How to plug the crank oil galleys



I have spoken out about removing the oil galleys balls in the crank.
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So once the balls are out
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So all the crud can be removed.
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After you have gotten most of the crud out, spray with brake cleaner.
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Then use a small brush to scrub the galley.
Then spray some more brake cleaner, and blow out with compressed air.
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Next have a new tap, and some sleeve retaining loc-tite
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6 bolt cranks use a 5/16 x 18 tap and set screw (3/8 long)
7bolt cranks use a ¼ x 20 tap and set screw (1/2 long)

Caution must be used when tapping the crank so you do not snap the tap off in the crank.
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Again spray with brake clean and blow out with compressed air.
Apply the green sleeve retaining loc-tite and screw in the set screw.
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After tighten the set screws, take a blunted center punch and peen a few spots around the set screw.
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This will deform the threads in both the crank and set screw so it cannot vibrate out.
Now you have a crank that you do not have to worry about the crud becoming loose and being carried into the bearings.
 
I have no issue installing a ground crank in a 4g. Also add to the fact that most all the cranks are over 20 years old finding a spec std crank can be a challenge.
My rule of thumb is a .25mm/.25mm in an H beam rod engine
.50mm/.50mm in a stock rod engine.

For removing the set screws, I have not come across one yet that I need to. But when the time comes, Ill figure a way too.
 
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