BEARINGS & CRANK
- I talked to Gil at OGTS. He said that the King main bearings that he sells have consistent width of the thrust bearing even in under sized bearings, unlike the Opel replacements where a 10 under main would have been 0.010” wider. Good news, I am good to send out my crank. Bad news, I could have sent out my crank a while ago. So, I will go ahead and box it up and ship it out.
I finally got started on refurbishing the 134 mm 2.4 Opel forged rods from Autoholic. Interesting experience as this metal is way different than the cast rods.
First of all, I am no expert by any means, but just sharing my experience. Feel free to hop on in with pro tips. I started by reading some RallyBob and other member tips the excellent Rod thread on this forum.
Not really an FAQ, since it goes beyond stock Opel parts, but I though this might be interesting to the engine builders out there. While cleaning up yesterday, I came across numerous sets of connecting rods and thought a comparison was in order. The Crower rods for a Ford 2300 are reasonably...
I picked up tips on what tools to use, what direction to grind in and where to remove material.
I started off by labeling each rod with a sharpie marker and recording the weight of each one. Next I went to work on the beams with a carbide burr in my air die grinder.
I first went after the wide seam in the beam.
Which made a silver stripe as I removed the high area.
I then kept removing material to make it full width.
Then I kept grinding away until the black stripe was gone. I figured this was the low area and weakest point of the beam, so I was just removing material from the stronger regions.
I have not yet done the sanding, but this for me down from an average of 652 grams to 647 grams each. So first pass was 5 grams per rod or 2.5 grams beam side.
Next I went to the big belt sander and took off the corners of the extra mass around the rod bolts, guided / inspired by pics of rallybob opel rod work.
Then I did some head scratching on how to clean up the mass in the corners by the edge of the rod journal and decided to use the mini/mill. It can only take off a few thousandths at a time, but it least it did so in a controlled manner. Below is a live action shot of that process. This got the first rod down to 632 grams. I have shaved off 22 grams from one rod and need to do the other 3. Even one rod takes a while as there are 4 of these surfaces to grind out per rod.
This got the first rod down to 632 grams. I have shaved off 22 grams from one rod and need to do the other 3. Even one rod takes a while as there are 4 of these surfaces to grind out per rod. It is tedious and tiresome and dirty work. So I will rest up and then tackle another one.