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Horsepower by Hauser

Joe Hauser's modifications to the 3-bearing 1600 crank

1) Drill the main bearings straight across - I use a 3/16" bit. Since cranks are hardened to an approximate thickness of 0.120", and since a centre punch will not start the hole, I start it with a grinding point or a 1/8" carbide burr. To finish penetrating the hardened surface use a 1/4" carbide bit. Drill straight in to 0.125"- 0.140". Then drill the angle hole - I use an electric drill or you may be able to use a vertical mill.

2) Plug - 002-003 interference. Fit alum or brass Loctite - smooth out the hole beforehand otherwise the plug may shave off so much it will not be tight.

3) Drill at an angle to intercept the original hole. I use a 5/32" bit. 

Note:- if you are using a 5 bearing crank, use metering plugs in the intermediate main bearings (#2 & #4) in the incoming oil holes. I tap them for 1/4", set the screws and then drill the screws with a 0.087 drill.

In addition, in both 3 and 5 main bearing engines, open up the oil hole in the top centre main bearing shell to the size of the hole in the block.

Col. Joe Hauser

These pages and images, unless otherwise stated, are copyright ©1999 & 2000, Joe Hauser, Rob Beddington & The Classic Fairlady Roadster Register. Do not redistribute in any form without the prior permission of the owner.