[TubingJon]

How much press do you need for a sleeve on a camshaft journal?

 

[davidray]

OK, I'll bite....what's a camshaft sleeve?



Dave

 

[TubingJon]

A Motorsport block with 55mm cam bearings has a 50mm at the last journal, a Dart block is 55mm at all 5. They make a sleeve for the cam for the last journal to make it 55mm so you can use it in a Dart block after it was made to fit a Motorsport, turn down the inside to fit and grind the OD to fit. I need to know how much press on the ID to keep it on.

 

[johndougherty]

I have used .0008" to .0012" press fit for cast iron dist drive gears. I would use the same for this. Just make sure when you grind the od on the cam to match the sleeve, it has zero taper. Heat the sleeve with a propane torch and slide it on.

 

[TubingJon]

I have used .0008" to .0012" press fit for cast iron dist drive gears. I would use the same for this. Just make sure when you grind the od on the cam to match the sleeve, it has zero taper. Heat the sleeve with a propane torch and slide it on.

Will do, I have heard to freeze the cam too. Does that make any sense?

 

[johndougherty]

You can freeze it if the press fit is on the high side. 8 tenths will push on easy if you warm up the sleeve.

 

[TubingJon]

Thanks for the help. Should be done by the end of the week, toughest part was getting the ground finish on the sleeve.

 

[johndougherty]

Yeah the sleeves are hard and tough to grind. I use a roller wheel and still have a tough time with chatter.