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Author
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Topic: Cam bearings to big, why?
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BLstangin
Gearhead Posts: 541
From: South Central MN
Registered: Apr 2002
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posted 05-31-2004 02:01 PM
   
Well, finally thought that I could put the 306 together after a line bore, but no. The cam bearings only have 600 miles on them, and the measured fine, with mics and telescoping gauges, now after coming back from the machine shop for a line bore, the back freeze plug was gone and the bearings appear as though the were mushroomed from top to bottom, but they still measure right from left to right? The bearings don't hardly look worn, but they have between .004-.006 clearance up and down and .0015-.002 side to side, so what gives?------------------
1970 coupe restored with the help of my dad. 306 with 600 holley, Weiand Stealth intake, headers, Comp cam, harland sharp roller rockers, kb pistons, 10.3:1 compression ratio, pertonix ignitor 2 with matched coil, lakewood bellhousing, 4-speed toploader, and 2.79 open 8" rear. Soon to be 9" 3.50 trac-lok
1986 f-150, 5.0, factory towing package with original c-6 trans
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zepheracer
Journeyman Posts: 12
From: Butte, Mt.
Registered: Jan 2003
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posted 05-31-2004 09:46 PM
The machine shop probably used a bar running through the cam bearing bores to hold the block while line boring the mains.
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BLstangin
Gearhead Posts: 541
From: South Central MN
Registered: Apr 2002
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posted 06-02-2004 01:38 PM
Well, I put new bearings in myself using the parts stores tools and they went in great. Now the cam turns a little hard, but not like is rubbing the bearings bad, just snug, does this sound o.k. to you? Dad said that it will break itself in, and not to worry about it, it won't score the bearings. What do you guys think? Hopefully it goes together soon!  ------------------
1970 coupe restored with the help of my dad. 306 with 600 holley, Weiand Stealth intake, headers, Comp cam, harland sharp roller rockers, kb pistons, 10.3:1 compression ratio, pertonix ignitor 2 with matched coil, lakewood bellhousing, 4-speed toploader, and 2.79 open 8" rear. Soon to be 9" 3.50 trac-lok
1986 f-150, 5.0, factory towing package with original c-6 trans
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Fastymz
Moderator Posts: 15523
From: Reno Nv USA MEM#1240
Registered: Apr 2001
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posted 06-02-2004 02:04 PM
 you fixed it yourself. Sorry to hear about all the bad luck you've been having. I sure hope it's fixed and ready for summer fun now.  ------------------
oddly obsessed with big scoops on little Mustangs 65 coupe,351w,C4,Big Boss 429 hood scoop,8" 3.40 TracLoc. My Pics
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Daniel Jones
Gearhead Posts: 658
From: St. Louis, MO
Registered: Aug 99
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posted 06-02-2004 03:10 PM
You can use an old cam as a cutting tool for the cam bearings. Cut grooves at an angle using a die grinder or similar. Slide it in using something for a lubricant/cutting fluid and turn it around. Dan Jones
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BLstangin
Gearhead Posts: 541
From: South Central MN
Registered: Apr 2002
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posted 06-02-2004 11:34 PM
Hey, thanks for the great tip Dan. I used the good cam and turned it a few times and it showed where it was rubbing and I polished it with some 2000 grit sandpaper, and now the cam is smooth as silk! It was the top of the 2nd cam bearing. Thanks for the good luck Scoop, this thing has been a pain, but finally, the crank is in, and the cam is in, a good start anyway. And yes I did it myself because I figured if it has to be done right, I might as well do it myself, the worst I could do was screw it up, and that's happened so many times with this motor because of other peoples mistakes, it doesn't bother me anymore. ------------------
1970 coupe restored with the help of my dad. 306 with 600 holley, Weiand Stealth intake, headers, Comp cam, harland sharp roller rockers, kb pistons, 10.3:1 compression ratio, pertonix ignitor 2 with matched coil, lakewood bellhousing, 4-speed toploader, and 2.79 open 8" rear. Soon to be 9" 3.50 trac-lok
1986 f-150, 5.0, factory towing package with original c-6 trans
IP: Logged |
Daniel Jones
Gearhead Posts: 658
From: St. Louis, MO
Registered: Aug 99
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posted 06-03-2004 02:33 PM
Sandpaper on bearings? I hope no grit is embedded in the bearing now. The usual approach is a bearing scraper.Dan Jones
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BLstangin
Gearhead Posts: 541
From: South Central MN
Registered: Apr 2002
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posted 06-04-2004 12:40 AM
Nope, no sand the in the bearing, it is 2000 grit, so it feels smooth as glass to the touch, and I completely washed the block again to make sure everything is clean!------------------
1970 coupe restored with the help of my dad. 306 with 600 holley, Weiand Stealth intake, headers, Comp cam, harland sharp roller rockers, kb pistons, 10.3:1 compression ratio, pertonix ignitor 2 with matched coil, lakewood bellhousing, 4-speed toploader, and 2.79 open 8" rear. Soon to be 9" 3.50 trac-lok
1986 f-150, 5.0, factory towing package with original c-6 trans
IP: Logged | |
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