Author Topic: camshaft pinion too tight?  (Read 405 times)

Offline coater87

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camshaft pinion too tight?
« on: 08.03. 2017 14:00 »
 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
Central Wisconsin in the U.S.

Online JulianS

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Re: camshaft pinion too tight?
« Reply #1 on: 08.03. 2017 18:22 »
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.


Online muskrat

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Re: camshaft pinion too tight?
« Reply #2 on: 08.03. 2017 19:28 »
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.
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Offline coater87

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Re: camshaft pinion too tight?
« Reply #3 on: 08.03. 2017 21:30 »
 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. *conf*

 Lee
Central Wisconsin in the U.S.

Online RichardL

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Re: camshaft pinion too tight?
« Reply #4 on: 09.03. 2017 01:45 »
As long as it's out of the cases, I think cam and key in the freezer and pinion in the oven.

Richard L.
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Online muskrat

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Re: camshaft pinion too tight?
« Reply #5 on: 09.03. 2017 09:49 »
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.
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Online RichardL

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Re: camshaft pinion too tight?
« Reply #6 on: 09.03. 2017 10:12 »
I think I glitched, and duh!
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Online RichardL

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Re: camshaft pinion too tight?
« Reply #7 on: 09.03. 2017 10:19 »
Do you think the cam lobes will damage the bushing as they're driven through?  *conf*
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Offline duTch

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Re: camshaft pinion too tight?
« Reply #8 on: 09.03. 2017 10:33 »

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

  *eek*  *shh*
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