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Small block 360 bearings look bad.................... #1949634
11/11/15 09:58 PM
11/11/15 09:58 PM
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dustergirl340 Offline OP
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We pulled a 360 down and the bearings look bad. Bearings 2, 4, and 5 don't even fit snugly into the main bearing cap anymore. They seem like they are egged. The lead overlay on number 5 bearing pretty much flaked out.

These bearings have about 30 passes on them.

What do you think the cause of this is? (see pics)...

IMG_4923.jpgIMG_4921.jpg
Re: Small block 360 bearings look bad.................... [Re: dustergirl340] #1949649
11/11/15 10:17 PM
11/11/15 10:17 PM
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Fulton County, PA
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CMcAllister Online content
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What do the rods look like?


If the results don't match the theory, change the theory.
Re: Small block 360 bearings look bad.................... [Re: dustergirl340] #1949651
11/11/15 10:18 PM
11/11/15 10:18 PM
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dustergirl340 Offline OP
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Haven't got that far yet.

Re: Small block 360 bearings look bad.................... [Re: dustergirl340] #1949655
11/11/15 10:28 PM
11/11/15 10:28 PM
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moparpollack Offline
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I think 30 passes caused that damage. shruggy

Does your motor have the lifter galley oil modification that puts mote oil to the bearings?


56 Plaza 63 D100 step side 67 Coronet, 68 Roadrunner, 69 Super Bees, 69 Coronet 500 convertible, 70 Roadrunner Post, 79 D150 360, and a severe case of Mopar a,d,d
Re: Small block 360 bearings look bad.................... [Re: moparpollack] #1949658
11/11/15 10:31 PM
11/11/15 10:31 PM
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dustergirl340 Offline OP
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Originally Posted By moparpollack
I think 30 passes caused that damage. shruggy

Does your motor have the lifter galley oil modification that puts mote oil to the bearings?


Nope, the block isn't modified.

Re: Small block 360 bearings look bad.................... [Re: dustergirl340] #1949663
11/11/15 10:43 PM
11/11/15 10:43 PM
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RSNOMO Offline
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Originally Posted By dustergirl340
We pulled a 360 down and the bearings look bad. Bearings 2, 4, and 5 don't even fit snugly into the main bearing cap anymore. They seem like they are egged. The lead overlay on number 5 bearing pretty much flaked out.

These bearings have about 30 passes on them.

What do you think the cause of this is? (see pics)...



1) How high did it get twisted???

2) How much temp did it see???

3) Oil???

Re: Small block 360 bearings look bad.................... [Re: dustergirl340] #1949665
11/11/15 10:44 PM
11/11/15 10:44 PM
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Affton MO
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qwkmopardan Offline
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Not enough clearance. Crank grinders like to grind your crank on high side, bearing manufacturer likes to give you bearing close to max wall thickness and old blocks main bores shrink from heat cycling. Now that it has bearings that look like these, guaranteed main bores have shrunk. Probably needs line honed.

When you get crank turned have turned .011-.021-.031 US to give you more bearing clearance. Clevite now makes bearing in std with ex clearance so if you have a new or good std. crank use part # MS1266HGX

An engine with a little to much clearance will run forever, one a little to tight will die young.

Re: Small block 360 bearings look bad.................... [Re: RSNOMO] #1949667
11/11/15 10:48 PM
11/11/15 10:48 PM
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dustergirl340 Offline OP
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Originally Posted By RS23U1G
Originally Posted By dustergirl340
We pulled a 360 down and the bearings look bad. Bearings 2, 4, and 5 don't even fit snugly into the main bearing cap anymore. They seem like they are egged. The lead overlay on number 5 bearing pretty much flaked out.

These bearings have about 30 passes on them.

What do you think the cause of this is? (see pics)...



1) How high did it get twisted???

2) How much temp did it see???

3) Oil???


6,000 RPM.
Runs 180-190 degrees.
Oils looks good.

Re: Small block 360 bearings look bad.................... [Re: qwkmopardan] #1949668
11/11/15 10:49 PM
11/11/15 10:49 PM
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dustergirl340 Offline OP
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Originally Posted By qwkmopardan
Not enough clearance. Crank grinders like to grind your crank on high side, bearing manufacturer likes to give you bearing close to max wall thickness and old blocks main bores shrink from heat cycling. Now that it has bearings that look like these guaranteed main bores have shrunk. Probably needs line honed.

When you get crank turned have turned .011-.021-.031 US to give you more bearing clearance. Clevite now makes bearing in std with ex clearance so if you have a new or good std. crank use part # MS1266HGX

An engine with a little to much clearance will run forever, one a little to tight will die young.


About the same as we were thinking....thanks

Re: Small block 360 bearings look bad.................... [Re: dustergirl340] #1949669
11/11/15 10:51 PM
11/11/15 10:51 PM
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moparpollack Offline
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Are you running a four speed still? four speeds are hard on parts.

Sorry to hear of your loss. angel


56 Plaza 63 D100 step side 67 Coronet, 68 Roadrunner, 69 Super Bees, 69 Coronet 500 convertible, 70 Roadrunner Post, 79 D150 360, and a severe case of Mopar a,d,d
Re: Small block 360 bearings look bad.................... [Re: dustergirl340] #1949672
11/11/15 10:57 PM
11/11/15 10:57 PM
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dustergirl340 Offline OP
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This is (was) in our '65 Dart. With a 727. Not a huge loss but just curious what happened.

Re: Small block 360 bearings look bad.................... [Re: dustergirl340] #1949691
11/11/15 11:29 PM
11/11/15 11:29 PM
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Lynchburg, VA
Leon441 Offline
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What oil pump?

What oil pan?

360 large mains need more oil to keep up the larger journals. High volume pumps will pump the pan dry.
Just an idea.


Career best 8.02 @ 169 at 3050# and 10" tires small block power.
Re: Small block 360 bearings look bad.................... [Re: dustergirl340] #1949701
11/11/15 11:52 PM
11/11/15 11:52 PM
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dustergirl340 Offline OP
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Factory pan, standard volume pump.

Re: Small block 360 bearings look bad.................... [Re: dustergirl340] #1949709
11/12/15 12:24 AM
11/12/15 12:24 AM
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dvw Offline
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I don't buy not enough clearance with damage that bad in only 30 passes on a mild build. I'd like to see all the bearings, rods and mains. What is "oil looks good"? It must have metal flakes in it, correct? What were the bearing clearances set at when it was built? Was it pre-lubed? What pressure was it running at? Why did you disassemble it in the first place? Internal noise? What does the oil pick-up screen look like? Are ALL the internal galley plugs correctly installed? A lot more investigation needs to be done before a proper diagnosis is made. Plenty of stock lower end 360's running around that stay together under quite a bit of abuse. Lets find the actual cause so there won't be a repeat.
Doug

Re: Small block 360 bearings look bad.................... [Re: dustergirl340] #1949714
11/12/15 12:32 AM
11/12/15 12:32 AM
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Didnt happen to mix and match main caps from a different block????

Re: Small block 360 bearings look bad.................... [Re: dvw] #1949731
11/12/15 12:52 AM
11/12/15 12:52 AM
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dustergirl340 Offline OP
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Originally Posted By dvw
I don't buy not enough clearance with damage that bad in only 30 passes on a mild build. I'd like to see all the bearings, rods and mains. What is "oil looks good"? It must have metal flakes in it, correct? What were the bearing clearances set at when it was built? Was it pre-lubed? What pressure was it running at? Why did you disassemble it in the first place? Internal noise? What does the oil pick-up screen look like? Are ALL the internal galley plugs correctly installed? A lot more investigation needs to be done before a proper diagnosis is made. Plenty of stock lower end 360's running around that stay together under quite a bit of abuse. Lets find the actual cause so there won't be a repeat.
Doug


mains were .002 clearance, oil pressure 30psi hot at idle. Prelubed. we'll take it down further in the next few days.

Re: Small block 360 bearings look bad.................... [Re: dustergirl340] #1949749
11/12/15 01:20 AM
11/12/15 01:20 AM
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Hows the cam bearing look, or still in the motor?

Re: Small block 360 bearings look bad.................... [Re: dustergirl340] #1949751
11/12/15 01:22 AM
11/12/15 01:22 AM
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dvw Offline
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Good enough.
Doug

Re: Small block 360 bearings look bad.................... [Re: dustergirl340] #1949993
11/12/15 03:00 PM
11/12/15 03:00 PM
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.002"? Measured or plastigaged?
That should be plenty of clearance provided the crank was ground without taper and the main bearing bores were correct when you assembled. You might want to think about replacing the main bolts too. That cap's parting line looks a little strange to me.


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Re: Small block 360 bearings look bad.................... [Re: dustergirl340] #1950005
11/12/15 03:14 PM
11/12/15 03:14 PM
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slantzilla Offline
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What does the crank look like? It is rough or discolored? That really looks to me like it was run out of oil. shruggy


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