Re: Small block thrust bearing cap alignment
[Re: crash520]
#2413164
12/04/17 05:45 PM
12/04/17 05:45 PM
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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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Guys, ref 360, thrust bearing cap to block alignment. I have ARP mains studs, without bearings fitted I noticed the surfaces front and rear of the #3 bearing cap to block did not have a slight miss alignment/step, installed the bearing and others in the block and dropped the crank in, measured crank end float at 0.018”, then installed the #3 cap with thrust bearing, re measured crank end float is now 0.001”.. Block has been align bored and prepped however should the #3 main cap have such an offset? I would have thought the front and rear surfaces should have had a smooth transition? Put the crank in it and snug the caps.. then use a mallet and hit the crank back and forth a couple of times then measure your end play and check your # 3 bearing
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Re: Small block thrust bearing cap alignment
[Re: crash520]
#2413173
12/04/17 06:10 PM
12/04/17 06:10 PM
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Joined: Jan 2005
Posts: 2,540 Milwaukee WI
TRENDZ
master
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master
Joined: Jan 2005
Posts: 2,540
Milwaukee WI
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No. You will wipe the oil off of the surface like a scaper.
"use it 'till it breaks, replace as needed"
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Re: Small block thrust bearing cap alignment
[Re: crash520]
#2413211
12/04/17 07:44 PM
12/04/17 07:44 PM
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Joined: Dec 2005
Posts: 11,611 Fulton County, PA
CMcAllister
Mr. Helpful
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Mr. Helpful
Joined: Dec 2005
Posts: 11,611
Fulton County, PA
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Never had this issue on mine. ARP studs didn't create any problems. Bump the crank back and forth to align the bearing halves. Also need to use a large screwdriver or bar to push the crank forward while tightening. .018 is a bunch. Shouldn't have to put the other half in to fix that. Someone would really have to screw up the cap during line boring. Does the cap look square to the bottom surface of the block? I assume the cap is original to the block and putting it on the block correctly?
If the results don't match the theory, change the theory.
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Re: Small block thrust bearing cap alignment
[Re: crash520]
#2413225
12/04/17 08:27 PM
12/04/17 08:27 PM
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Joined: Mar 2006
Posts: 9,852 MI, usa
dvw
master
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master
Joined: Mar 2006
Posts: 9,852
MI, usa
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Thanks Doug, I did notice without the crank installed and having the caps installed, the studs on #3 can’t be wound out like the others, i.e, there is binding in the hole of the cap, this I also don’t like. So if I open up the cap holes on #3 in order to align the cap with the block, thus removing the bearing half offset to prevent wiping oil off like a scraper, I’ll be left with 0.018” end float on the crank, are std diam with oversized thrust available? Put the bearing shell thrust surface on a piece of 240 grit sand paper against a pane of glass. I used my garage window. The last one I did (currently in my 900hp 572") had a surface that was even close to flat. Didn't take to much to bring it around. Doug
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Re: Small block thrust bearing cap alignment
[Re: dvw]
#2413335
12/05/17 12:04 AM
12/05/17 12:04 AM
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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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The studs are most likely larger shank diameter than the original bolts. Open up the holes in the cap. Then when you seat the cap you can move it where it needs to be. Make sure to seat it with cap moved forward. Doug thats how I fixed mine.
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: Small block thrust bearing cap alignment
[Re: crash520]
#2414366
12/06/17 08:19 PM
12/06/17 08:19 PM
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Joined: Nov 2004
Posts: 3,544 Syracuse,NY
CompWedgeEngines
master
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master
Joined: Nov 2004
Posts: 3,544
Syracuse,NY
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Guys, ref 360, thrust bearing cap to block alignment. I have ARP mains studs, without bearings fitted I noticed the surfaces front and rear of the #3 bearing cap to block did not have a slight miss alignment/step, installed the bearing and others in the block and dropped the crank in, measured crank end float at 0.018”, then installed the #3 cap with thrust bearing, re measured crank end float is now 0.001”.. Block has been align bored and prepped however should the #3 main cap have such an offset? I would have thought the front and rear surfaces should have had a smooth transition? Just wondering, was this the original cap for the block? if not, it could very well affect that locating. Look at a bunch of caps,and you'll see the holes all over the place in them. ( think like looking at core shift in a part) Most likely, as mentioned, you will need to ream ( an adjustable blade reamer works fine if you have access) or drill the cap, so that it can properly locate itself.The registers hold the cap in the block and locate it anyhow, the bolts and studs keep it all together. Once you open up the holes, the cap will float, then you can set the thrust with a deadblow hammer. I always start with the crank snout, then back to the flange. Dont be afraid to hit it either, you wont hurt it. You will immediately see the crank spin more freely after you set the thrust from the back.
RIP Monte Smith
Your work is a reflection of yourself, autograph it with quality.
WD for Diamond Pistons,Sidewinder cylinder heads, Wiseco, K1 rods and cranks,BAM lifters, Morel lifters, Molnar Technologies, Harland Sharp, Pro Gear, Cometic, King Engine Bearings and many others.
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