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Cam not fitting into cam bearing
#1458834
06/27/13 07:42 AM
06/27/13 07:42 AM
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Joined: Jan 2003
Posts: 17,918
Akron, Ohio
ProSport
OP
I Live Here
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OP
I Live Here
Joined: Jan 2003
Posts: 17,918
Akron, Ohio
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My camshaft slid all the way in til it got to the cam bearing on the front of the motor. Cam and cam bearing both measure 1.98, should I try another front cam bearing or have the cam journal shaved about .005 in a lathe?
I've never seen this before and I've wasted 2 rare free days from baseball trying to polish this cam journal.
1970 Challenger, all aluminum 528 Hemi, HDK suspension, Tremec 5 speed manual
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Re: Cam not fitting into cam bearing
[Re: ProSport]
#1458835
06/27/13 08:44 AM
06/27/13 08:44 AM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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You just need to size the bearings.. I use a old cam that has a slot cut into it on each bearing jourmal for sizing... slide it in and I spin it with my impact wrench 
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Re: Cam not fitting into cam bearing
[Re: ProSport]
#1458837
06/27/13 09:48 AM
06/27/13 09:48 AM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
That sounds brutal lol. Won't that take the coating off the cam bearing?
Yep... The big name shops do the same thing.. if you
have a mopar shop around you they might loan out their
cam sizer to you
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Re: Cam not fitting into cam bearing
[Re: ProSport]
#1458839
06/27/13 10:06 AM
06/27/13 10:06 AM
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Joined: Jan 2003
Posts: 75,050
U.S.S.A.
JohnRR
I Win
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I Win
Joined: Jan 2003
Posts: 75,050
U.S.S.A.
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Quote:
My camshaft slid all the way in til it got to the cam bearing on the front of the motor. Cam and cam bearing both measure 1.98, should I try another front cam bearing or have the cam journal shaved about .005 in a lathe?
I've never seen this before and I've wasted 2 rare free days from baseball trying to polish this cam journal.
As said above me did you spin the cam around to confirm it is the front journal hanging you up?
Who installed the bearings and how was the front bearing installed , from the front or with the tool installed thru the rear?
I used to have a tool like Mr. P describes until I ruined a bunch of bearings replacing a couple of bearings after I sized them all initially with that tool.
Should you decide to make a tool that way the first thing you need to do is confirm the tool(cam) is absolutely straight.
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Re: Cam not fitting into cam bearing
[Re: Stanton]
#1458841
06/27/13 10:26 AM
06/27/13 10:26 AM
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Joined: Jan 2003
Posts: 8,028
Tulsa OK
Bad340fish
master
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master
Joined: Jan 2003
Posts: 8,028
Tulsa OK
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I just had the same issue but I had to take the block back to the shop for something else so i didn't mess with it at home. It appears my shop honed the cam bearings with something very fine. They almost look untouched until you look at them real close. The came fits perfect now.
68 Barracuda Formula S 340
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Re: Cam not fitting into cam bearing
[Re: Stanton]
#1458843
06/27/13 11:01 AM
06/27/13 11:01 AM
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Joined: Jan 2003
Posts: 75,050
U.S.S.A.
JohnRR
I Win
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I Win
Joined: Jan 2003
Posts: 75,050
U.S.S.A.
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Quote:
Oh, do NOT mess with the cam !!!
 polishing the cam journal is not the way to correct this.
I used a 320 grit medium density flap wheel to clean the #5 bearing so the cam would fit and it fit all the other bearings fine.
When I originally put the cam in it did the same thing, fit it till it came time to seat it fully making one think it's the front bearing that is the problem when the came is finally seating itself into all the bearings at basically the same time.
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Re: Cam not fitting into cam bearing
[Re: ProSport]
#1458845
06/27/13 11:44 AM
06/27/13 11:44 AM
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Joined: Jan 2003
Posts: 8,940
Holly/MI
Dean_Kuzluzski
master
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master
Joined: Jan 2003
Posts: 8,940
Holly/MI
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I'm a hack, but got my cam in my 440 rebuild to spin nicely with just a brake hone and some WD-40.
R.I.P.- Gary "Coop" Davis 02/09/68-05/13/04
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Re: Cam not fitting into cam bearing
[Re: Cab_Burge]
#1458848
06/27/13 01:16 PM
06/27/13 01:16 PM
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Joined: Jan 2004
Posts: 13,247
Mt. Vernon, Ohio
dartman366
I Live Here
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I Live Here
Joined: Jan 2004
Posts: 13,247
Mt. Vernon, Ohio
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Quote:
Quote:
Cure the problem, not the symptom! This is a short article taht describes the root cause and proper solution for camshafts not turning in factory Mopar blocks.
http://musclemotorsracing.com/muscle-mike-blog/82-the-real-reason-my-cam-wont-turn.html
Mopar miss the boat on te cam tunnel finishing to the correct size  
small blocks have the same problem, had a 318 once that it happened to and the shop at the time told me to use the old cam with grooves filed into the journal and ream it to size,,I looked at the guy like he was out of his mind,I did it, it worked, but I didn't like it as it made the bearing surface rough,,the guy that does my work now fixes the problem if it occures as Mike explained and makes sure everything fit's as it is supposed to,,,,engine builders that know how to fix things right,,,,,,,priceless! 
Light travels faster than the speed of sound,,,this is why some people seem bright untill you hear them speak.
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Re: Cam not fitting into cam bearing
[Re: Cab_Burge]
#1458849
06/27/13 01:21 PM
06/27/13 01:21 PM
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Anonymous
Unregistered
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Anonymous
Unregistered
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Obviously this would apply to new after market blocks as well, correct?
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Re: Cam not fitting into cam bearing
[Re: ]
#1458850
06/27/13 02:08 PM
06/27/13 02:08 PM
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Joined: Oct 2005
Posts: 8,881
Ontario, Canada
Stanton
Don't question me!
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Don't question me!
Joined: Oct 2005
Posts: 8,881
Ontario, Canada
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Quote:
My block was baked and heard that can add to the problem too
Really ?!?!?! After all the heat cycles its been through you think baking is gonna cause problems ???
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Re: Cam not fitting into cam bearing
[Re: dartman366]
#1458851
06/27/13 02:18 PM
06/27/13 02:18 PM
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Joined: Oct 2005
Posts: 8,881
Ontario, Canada
Stanton
Don't question me!
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Don't question me!
Joined: Oct 2005
Posts: 8,881
Ontario, Canada
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Quote:
http://musclemotorsracing.com/muscle-mike-blog/82-the-real-reason-my-cam-wont-turn.html
Really ?!?! So what did the factory do, specify all cam journals be ground undersize? Or did they hone the bearings? Or did they just pound in the cams and hope for the best?
I suppose this MM solution is the best if you're sending out a bare block to be done but most times we're already well beyond that stage when we're installing the cam and this solution is pretty much out of the question. There's nothing wrong with scraping or sanding a cam bearing to fit. Personally I don't like the hone idea unless you're sure material needs to be removed from the whole i.d. but in most case its usually hung up on a small area.
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Re: Cam not fitting into cam bearing
[Re: Jeremiah]
#1458853
06/27/13 02:39 PM
06/27/13 02:39 PM
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Joined: Feb 2005
Posts: 20,185
PA.
pittsburghracer
"Little"John
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"Little"John
Joined: Feb 2005
Posts: 20,185
PA.
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I never had an issue with a small block mopar but I know several other that say its a BIG issue on small block fords.
1970 Duster
Edelbrock headed 408
5.984@112.52
422 Indy headed small block
5.982@112.56 mph
9.42@138.27
Livin and lovin life one day at a time
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Pulled em out and installed a set of Durabond PDP-17 (uncoated) bearings after reading a couple other posts here. I used the same tool and method I had installed the others and cam slid right in with no clearancing whatsoever. My block was baked and heard that can add to the problem too??
