When do you replace it , what about the length ?

 

you can check it using pin gauges But caution you can get it stuck in the hole with little way of moving it

how i check it - clean and dry the bushing and the oil pump shaft, with a known not to be worn using a tenths mike - then install a dead true shaft NEW ONE preferred, into the bushing and see if you can feel any movement up and down or side to side but the load is up and down - you can then use a dial gauge to check the movement -- the spec is .0008 to .001, normally you can not feel that between two pieces < reason to look for movement

if its loose - heat the case half using a heat oven to 250 degrees check with a gun

we use two tools one is a snap on dowel pin puller - the other is a thread tap - screw the tap into the bushing and then slide hammer the bushing out as if it was a dowel pin

clean the case bushing hole after it cools NO honing tools or wire brushes, only thing the case can be cleaned with is a nylon brush and lacquer thinner

re heat the case to 250 degrees - we made a pilot that installs the bushing and its 3 inches long with out changing its size, we then had a short front 6 flute stepped reamer made as no tool is available from anyone, and we when the case is at room temps size to in the spec after it cools

stay away from doing this your self, its not a novas job for a home mechanic