vintagewrench
Active member
- Joined
- May 9, 2016
- Location
- Paradise
Andrew, There is a better way to deal with the scored bearing than polishing and no abrasives will get into the engine. Check out http (insert colon) //theoldmotor.com/?p=56711 on my website that shows bearing scrapers and contains a link to a good article that tells you how to use them.
Use the other cam and remove any oil from both the bearing journal and the bearing and put it in dry. If it is too tight to turn with the cap on, use the cam bearings and caps on either side to hold it. Turn it at least a couple of revolutions and remove the cam. The shiny spots that show contact on the bearing need to be scraped down; continue until it turns reasonably well and then put the cap on with the bolts somewhat loose and follow what you did earlier with the lower half until you can fully tighten down the bolts and the cam turns by hand.
When you get to that point (it can take quite a bit of time) oil it and spin the cam by some means and then pull it apart and scrape the high spots that show again until you can turn the shaft easily by hand. At that point plastigauge it to ensure you have the required clearance.
Take your time as to do this right and may take several hours to accomplish but if you do it correctly you may be be able to use the head as is at least for a while.
You can use scraper part # 3779A11 @ http://www.mcmaster.com/#bearing-scrapers/=142vbcb and get it quickly from McMaster-Carr in Atlanta.
Use the other cam and remove any oil from both the bearing journal and the bearing and put it in dry. If it is too tight to turn with the cap on, use the cam bearings and caps on either side to hold it. Turn it at least a couple of revolutions and remove the cam. The shiny spots that show contact on the bearing need to be scraped down; continue until it turns reasonably well and then put the cap on with the bolts somewhat loose and follow what you did earlier with the lower half until you can fully tighten down the bolts and the cam turns by hand.
When you get to that point (it can take quite a bit of time) oil it and spin the cam by some means and then pull it apart and scrape the high spots that show again until you can turn the shaft easily by hand. At that point plastigauge it to ensure you have the required clearance.
Take your time as to do this right and may take several hours to accomplish but if you do it correctly you may be be able to use the head as is at least for a while.
You can use scraper part # 3779A11 @ http://www.mcmaster.com/#bearing-scrapers/=142vbcb and get it quickly from McMaster-Carr in Atlanta.