28-04-2021, 09:11 PM
(This post was last modified: 28-04-2021, 09:18 PM by Howard Wright.)
Hi Steve
You would be extraordinarily lucky to get four unmatched con rods and ends to fit a different crank without some scraping. But first you need to make sure that the rods and crank are both the same size. The crank may have been reground so it is less than it’s true diameter and the rods may have been been bored to this reduced diameter.
If you can establish that both crank and rods are the same nominal size (micrometer) you need to blue the journal, fit the rod and cap and check where the blue is being removed or marked (I find I often don’t need blue as I can see the smooth interference marks on the white metal). The “high points” need to be carefully scraped using a sharp engineers scraper. It’s a very long process. The aim is that the rod should just fall under its own weight.
Hope this helps?
Cheers
Howard
Hi Steve (again)
I think you really need to do some reading before attacking the crank rod assembly. I think both Woodrow and Williams are helpful but there is also a lot of info on the web.
Cheers
Howard
You would be extraordinarily lucky to get four unmatched con rods and ends to fit a different crank without some scraping. But first you need to make sure that the rods and crank are both the same size. The crank may have been reground so it is less than it’s true diameter and the rods may have been been bored to this reduced diameter.
If you can establish that both crank and rods are the same nominal size (micrometer) you need to blue the journal, fit the rod and cap and check where the blue is being removed or marked (I find I often don’t need blue as I can see the smooth interference marks on the white metal). The “high points” need to be carefully scraped using a sharp engineers scraper. It’s a very long process. The aim is that the rod should just fall under its own weight.
Hope this helps?
Cheers
Howard
Hi Steve (again)
I think you really need to do some reading before attacking the crank rod assembly. I think both Woodrow and Williams are helpful but there is also a lot of info on the web.
Cheers
Howard