Hey guys I am in the middle of doing some work on my 89 460 motor while its out of the truck. I am going to change the rear main seal in the morning and I was wondering how to measure the crush. I have read about how important it is, but can't seem to understand how its measured.

thanks!

 

bearings have crush, the seal doesnt. you cant measure something like that unless you remove the crank

 

It's a two piece seal. It does have crush. The two halves were made too long from the factory, so when the bearing cap is installed, a gap opens in the seal.

To measure it, put one half in the engine. Make one end of the seal perfectly flush with the surface, and measure how much the other end is protruding over the surface (I'm not sure what is the preferred tool for this). Repeat using the other half in the bearing cap. Each half should protrude about .010-.015" for a total of .020-.030". Trim as necessary.

 

thanks peter, nothing i read was worded in a way that I understood it. Your directions are perfect!!