Roller Cam Install Problem

[tmsbuic]

What I have noticed after I slid the new roller cam inside the block(Full Throttle Cam) is its rubbing the block in an area it shouldn't be. It feels like the raised machined surface behind the circle with a flat edge on it(behind the cam sensor gear) that rides against the block isn't thick enough and allowing the cam to go back further than it should. The cam that came out and the original cam that I still have don't do it. Do you all think its a machining flaw on the cam or do I need to get some type of shim(if there is such a thing)?

 

[VadersV6]

Probably need a pic cause that description doesnt really do it. You're saying behind the cam sensor gear...the cam sensor isnt still in the block is it? If there are any parts that can be removed to eliminate your problem, of course you should pull it off. But other than that, I cant think of what it is you're talking about. Are you talking about a feature on the block thats in the way, or is there some sort of boss, or bulge on the cam thats hitting something? Maybe the cam is in all the way but doesnt look like it because of something that may mount to the nose of the cam?...Are the lobes where they should be when you look in the lifter bores?

 

[tmsbuic]

Okay, you have the round circle with a flat edge on it. This the part of the cam that the top timing gear bolts too. Now behind this round part of the cam right before the first bearing journal of the cam is a raised machined area. Kinda acts like a thrust ring. On the block, there is an area that this rides against. When the cam is slid all the way into the block, there is a rough rubbing going on at this machined area. I hope this can give you an idea on what I'm talking about.

 

[Quick6'n'-K.C.]

Is the crank in, and have you slipped the timing chain on to see where its aligned with both gears on?
BW

 

[Blown&Injected]

you should be able to push the cam in all the way and it should spin freely.

This is not a billet cam, is it? Those require some stuff be done for them to fit properly in the block but since I have not done one of them, I can't say exactly what goes on with them

 

[Quick6'n'-K.C.]

you should be able to push the cam in all the way and it should spin freely.

This is not a billet cam, is it? Those require some stuff be done for them to fit properly in the block but since I have not done one of them, I can't say exactly what goes on with them

You sure, cause the cam doesnt ride against the block and ive had a few that will slide back too far beyond where the chain would go...

Thats why i asked if the crank was in place to have the cam a little bit off the block with the chain in place
BW

 

[tmsbuic]

No, its not a billet cam. I have the crank and timing gear on. My old cams will go in and spin freely. I just don't like the fact that even with the chain on, the cam can walk back and forth some.

 

[Blown&Injected]

a roller cam must have the proper end play set - should not walk!

I put the cam in with all the shims for the cam button, and then the cover. The cam was tight and would not turn so I pulled the cover and removed one of the shims and then put the cover back on. it then would turn freely and there was the slightest play when prying the cam back and forth.

 

[REDS HOT AIR]

if you cant see what its rubbing it may be rubbing the freez plug at back of the block

the ductile roller cams have to have the end play set tight if not the cam can move forward enough that the extra wide lobes can hit the lifter that rides the next lobe over

 

[tmsbuic]

I smeared some grease on the back side of the plate and found what was rubbing. There was some high casting edges that I just used a flat file and smooted down.

 

[REDS HOT AIR]

I smeared some grease on the back side of the plate and found what was rubbing. There was some high casting edges that I just used a flat file and smooted down.

on the cam or on the block ?

just wondering

 

[tmsbuic]

It was on the cam.