Mis-aligned cam bearings

Fritz Maurer

Well-known Member
Camshaft would not come out of F-12 engine without reaming the center bearing with the oil pump drive gear. What corrective action can be taken for the installation of new bearings? Thanks, Fritz
 
Have your local auto machine shop to install new cam bearings. Take the cam along so they can measure it. If the new cam bearings need to be reamed they have the tools. Hal
 
If the drive gear is bigger than the bearing, then something is strange. A reamed bearing is common to fit the cam journals, but I have difficulty figuring how it got smaller as you described, if the gear is bigger. Jim
 
I have disassembled a couple of F12 engines and have had the same thing happen to me. What happens is that many years of use wear the gear to the point that a little burr is raised along the edge of the teeth, this makes the gear just enough bigger to scrape the bearing when you remove the camshaft. Grind or file off that burr and it will go back in without scraping the bearing.
 
Just a guess. After a half dozen years of field experience, they probably found that cam bearing wear wasn't a problem. No reason not to save the expense.
 
Different engine manufacturer was engineered different. IH probably thought the engine block on the A's & B's was good enough for the cam shaft. Seem to work for all those years. Hal
 

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