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360 assembly

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jcisworthy View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote jcisworthy Quote  Post ReplyReply Direct Link To This Post Posted: Jan/16/2018 at 4:57pm
Did you check your thrust bearing clearance, #3 bearing. 

Are you sure the thrust is not wedging up against the crank throw when you torque it? 

Are you regestering the thrust when you assemble it? 

Specializing in dyno services, engine building, and cylinder head porting

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Lyle View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Lyle Quote  Post ReplyReply Direct Link To This Post Posted: Jan/16/2018 at 5:21pm
jcis has a point here and you can check the crankshaft with just feeler gauges.
Bolt up and lube #2, #3, #4 and with feeler gauges ensure your thrust clearance full rotation without bearings in #1 or #5.
Now rotate the half bearings into the block #1 and #5, no caps.
With feeler gauges rotate the crankshaft and check clearance as you rotate the crankshaft on #1 and #5.
If the bearing binds and rolls out or the clearance changes on rotation you know were the problem is.
If you cannot get a bearing in you know were the problem is.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Red20 Quote  Post ReplyReply Direct Link To This Post Posted: Jan/16/2018 at 8:30pm
Originally posted by Lyle Lyle wrote:

jcis has a point here and you can check the crankshaft with just feeler gauges.
Bolt up and lube #2, #3, #4 and with feeler gauges ensure your thrust clearance full rotation without bearings in #1 or #5.
Now rotate the half bearings into the block #1 and #5, no caps.
With feeler gauges rotate the crankshaft and check clearance as you rotate the crankshaft on #1 and #5.
If the bearing binds and rolls out or the clearance changes on rotation you know were the problem is.
If you cannot get a bearing in you know were the problem is.


That’s new to me, but a really good process. I love this forum. I’ve only put together one short block. I’ve always started with assembled short locks every other time.
1969 Javelin SST "Screamin' Banana" - Totaled Feb 2018
1973 Hornet Sportabout X "yellajack" - 360/727/TracLoc DAILY DRIVER
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Samuelsc360 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Samuelsc360 Quote  Post ReplyReply Direct Link To This Post Posted: Jan/17/2018 at 5:26am
Originally posted by Lyle Lyle wrote:

jcis has a point here and you can check the crankshaft with just feeler gauges.
Bolt up and lube #2, #3, #4 and with feeler gauges ensure your thrust clearance full rotation without bearings in #1 or #5.
Now rotate the half bearings into the block #1 and #5, no caps.
With feeler gauges rotate the crankshaft and check clearance as you rotate the crankshaft on #1 and #5.
If the bearing binds and rolls out or the clearance changes on rotation you know were the problem is.
If you cannot get a bearing in you know were the problem is.
I will try this next. Thanks.
1971 SC360
1973 Ambassador Sedan 360
1973 Hornet X 360
1973 Javelin AMC 401
1975 Sportabout X 258
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Samuelsc360 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Samuelsc360 Quote  Post ReplyReply Direct Link To This Post Posted: May/09/2018 at 10:10am
I ordered another crankshaft to isolate the problem. Same thing so I knew it was the block. Took it back to the machine shop and had it align bored. Everything is perfect. As for using Plastiguage, it was absolutely worthless in determining my problem. All bearings were in spec.  
1971 SC360
1973 Ambassador Sedan 360
1973 Hornet X 360
1973 Javelin AMC 401
1975 Sportabout X 258
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