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I.D. This Fastener


MochetVelo

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Here is an unusual stack of screw heads and nuts on my 2-cylinder, 1911 Renault. They plug an access hole to access the front piston. I'm wondering about the round one with four slots. I might find the tool for this if I knew what it is called!

 

Phil

 

 

 

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Yes, I would probably have used pliers, also. However, the hex bolt below it removed the whole unit revealing a threaded, tapered plug covered in black carbon soot. The hole itself allows a rod to be used to determine TDC (top dead center of piston) and set the spark timing.  I'm assuming the taper seals the top of the cylinder.

 

Phil

 

 

IMG_3406.JPG

Edited by MochetVelo (see edit history)
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I would think a common Spanner Wrench would fit your bolt head.  They only use two slots at a time ( 180 degrees apart).  Measure the distance across the top of the bolt head between the slots and this would give you a basic size.  I would put the bolt in a drill press ( I have no Lathe) and clean it up using fine emery paper.  Look on E-bay for used Spanner wrenches.  Interesting car you have.  Life is Good  Don

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Leave it to the the Frogs and the Brits to come up with ersatz fasteners. Start with what looks to be a 3/8" (or so) socket. It, and about 5 minutes, with your bench grinder and.......Voila....near instant spanner..............Bob

Edited by Bhigdog (see edit history)
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