camshaft pinion too tight?

[coater87]

 I have a new camshaft from SRM bought some years ago.

 My camshaft pinion does not want to slide onto the cam at all. Its going to be a press fit at best and thats without the key.

 Are they suppose to be that tight?

 If so, do you heat the pinion and try to get it home over the key in one shot, or do I have some ill fitting parts?

 Thanks,
Lee

[JulianS]

The pinion is not a sliding fit it needs to be tapped on using a suitable cylindrical drift, but if it seems too tight I would try a different pinion.

Should not need heat.

[muskrat]

G'day lee
Yes they are a tight fit. Be careful that the key doesn't slide back and damage the bush.I made a "puller that uses the camshaft thread to push it home.
Cheers

[coater87]

 Ok,

 Thanks guys. I think I will install the cam and pinion before I bring the cases together. I think that will be easier, and I can use a block of wood to help support the cam instead of banging against my bushings. May make it easier to keep an eye on that key too.

 But first I have to do one of my most hated jobs, and thats clean everything one more time. I spent most of a summer during high school doing that almost exclusively. Every day cleaning dirty parts with solvent that was dirtier than the parts were.

 Lee

[RichardL]

As long as it's out of the cases, I think cam and key in the freezer and pinion in the oven.

Richard L.

[muskrat]

It shouldn't be that tight it needs the heat/freezer treatment (a few minutes in hot water should do it) and it must be through the right side case before the pinion is fitted. If the cases are together (no barrels) I jam 1/2 a timber cloths peg between the left cam lobe and case to stop it retreating.
Cheers

[RichardL]

I think I glitched, and duh!

[RichardL]

Do you think the cam lobes will damage the bushing as they're driven through? 

[duTch]

 

Do you think the cam lobes will damage the bushing as they're driven through?