Proper Fastener Preparation (#8) - Engine Builder Magazine

Proper Fastener Preparation (#8)

The best way to insure that threads are in optimum condition is by utilizing thread restoring tools.  These tools are designed to clean and restore existing threads, not to cut new ones.

Most typical tap and die sets are designed to cut new threads and their ability to remove material is detrimental to used threads. Male and female threads found throughout the automotive industry have approximately 75% contact between the threads and using a tap and die set will very likely reduce this contact percentage further by removing necessary material from the fastener and/or the threaded receiver. This reduction in mass will affect torque values and ultimately the ability of the fastener to maintain proper holding properties.

Thread restoring sets can be obtained from most, if not all, of the major automotive tool suppliers and are a valuable addition to any tool collection. Finally, all blind holes most be free of residue and all threads and contact surfaces should be lubricated sparingly with clean oil or assembly lube.

Bill Riordan

Riordan Engineering

Twin Lake, MI  

 

Shop Solutions July 2022

When the timing cover or block has no dowel pins, or the dowel holes do not fit snug on the pins. Take an old damper and hone the center so that it is now a slip fit onto the crank snout. Use it to hold the cover in place while tightening the bolts.

THREAD IT TO REMOVE IT

Solid, smaller-sized dowel pins can be stubborn sometimes. One of the most useful ways I’ve found to deal with the really stubborn ones is to start by putting a heavy chamfer on the outside edge of the dowel with a grinder. Then, I run a die on it. In this case, the dowel is 1/4” OD and the die used was a 1/4-20 NC. Run the die on it as far as you can and then remove it. Lay a washer over the dowel, turn a nut on the dowel until it stops. Take the nut back off, add another washer and repeat until the dowel comes out.

Shop Solutions June 2022

I needed a narrow grooving tool to quickly clean carbon from piston ring grooves for an engine restoration project. All the usual grooving tools were too wide.

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