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360 assembly

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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 Topic: 360 assembly
    Posted: Jan/13/2018 at 8:38am
I have assembled the block on my 360 twice. Everytime I torque the main bearing caps, I can't turn the crankshaft with and 18" pipe wrench. The crank was machined .020 and the bearings are .020. I used assembly lube on all bearings and the cylinders and poured 50 wt oil into the rings. What's wrong?  
1971 SC360
1973 Ambassador Sedan 360
1973 Hornet X 360
1973 Javelin AMC 401
1975 Sportabout X 258
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Post Options Post Options   Thanks (0) Thanks(0)   Quote tyrodtom Quote  Post ReplyReply Direct Link To This Post Posted: Jan/13/2018 at 9:28am
Did you check that each bearing was .020,  not just what was written on the boxes ?
It's happened to me .

Did you check your clearances with plastigage ?
66 American SW, 66 American 2dr, 82 J10, 70 Hornet, Pound, Va.
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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/13/2018 at 9:41am
I didn't use Plastiguage but I checked the bearings. They were stamped .020.
 
1971 SC360
1973 Ambassador Sedan 360
1973 Hornet X 360
1973 Javelin AMC 401
1975 Sportabout X 258
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232jav3sp View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 232jav3sp Quote  Post ReplyReply Direct Link To This Post Posted: Jan/13/2018 at 10:30am
You need to plastigauge or use a michrometer to measure both  the crank's journals and the main journals WITH the bearings installed and the caps torqued to spec, then do a little basic subtraction to get your clearance number. Never trust the sire stamped on the bearings and you should make sure your machinist turned the crank the amount claimed.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote SC397 Quote  Post ReplyReply Direct Link To This Post Posted: Jan/13/2018 at 10:33am
Bearings or crank is wrong. You should be able to spin the crank by hand with no issue after the mains are torqued.
I have had miss-boxed bearings before. There is never just one set got out after a quality issue.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Boris Badanov Quote  Post ReplyReply Direct Link To This Post Posted: Jan/13/2018 at 12:15pm
Old school procedure, assemble a bare crank in the mains, torque to full torque
then plastigauge and assure it's spinning freely.

Careful not to amputate your finger(s)......

Next, do each rod on it's journal with no rings on the piston.

Saves a lot of headache even if you have the proper measuring tools.

No joke about the fingers, An old friend broke two doing just this, was lucky not to lose them.
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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/13/2018 at 12:21pm
Thanks for the suggestions. I'll try again. I can break loose the main bolts and the crank will turn with the rod bolts torqued.  
1971 SC360
1973 Ambassador Sedan 360
1973 Hornet X 360
1973 Javelin AMC 401
1975 Sportabout X 258
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Post Options Post Options   Thanks (0) Thanks(0)   Quote matty 401 Quote  Post ReplyReply Direct Link To This Post Posted: Jan/13/2018 at 12:26pm
can you turn the crank after you torque the first main cap  i have always done mine that way  torque a main spin the crank 
72 matador 401 the beast
79 concord 2 door
72 matador 304 grasshopper
68 Rogue 406
93 Cherokee 4.0 5 speed

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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/13/2018 at 1:13pm
I did that through the whole sequence the second time. The crank got progressively tighter and tighter as I went.  
1971 SC360
1973 Ambassador Sedan 360
1973 Hornet X 360
1973 Javelin AMC 401
1975 Sportabout X 258
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Post Options Post Options   Thanks (0) Thanks(0)   Quote tufcj Quote  Post ReplyReply Direct Link To This Post Posted: Jan/13/2018 at 5:15pm
You do have the thrust bearing in #3, not #5 like a Chevy?

Bob
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