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01-24-2002, 11:09 AM | #1 |
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302 crankshaft clearance q?
I'm using a red plastigage to measure up the crank and main bearings. what are the correct or specific numbers?
so far i have this to show: main #1 .003+ main #2 .002= main #3 .003= main #4 .003= main #5 .003= I bought this long block from someone. and the plans are to go carb with some iron windsor jr heads. thanks Last edited by slider; 01-24-2002 at 07:30 PM.. |
01-24-2002, 10:41 PM | #2 |
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ttt
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01-25-2002, 06:48 AM | #3 |
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That's way too much. Your range is .0005" - .002" for the Mains, and .0008" - .002" for the rods.
Take care, -Chris
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01-25-2002, 03:49 PM | #4 | |
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thanks |
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01-25-2002, 05:42 PM | #5 |
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you should run .0025 on both rods and mains. .003 is a bit loose but will work. anything tighter than .002 is not good and will speed up bearing wear and heat. since you have different clearances between all the mains i would suggest you have the crank cut .010 under so all the clearances are the same.
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01-25-2002, 07:58 PM | #6 | |
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Quote:
Take care, -Chris
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01-25-2002, 10:27 PM | #7 | |
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my chart here can read .002 to .006 inches. and my numbers above seem not so accurate or correct according to what I've read in the forums here. the higher the number, the tighter it is, based on the red plastigage and it's chart. wouldnt .0015 inch be too loose? .002 inch should be really tight. So I'm still confused. maybe I'm using the wrong method here. |
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01-25-2002, 10:29 PM | #8 |
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Are you saying it's okay to be above .004 and no more than .0015?
if so then that answers my question |
01-25-2002, 11:12 PM | #9 |
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no its not ok to be above .004, thats 4 thousandths of an inch, chris said the tolerance is between .0005" and .002" (1/2 of a thousandth and 2 thousandths of an inch)
i had my crank polished a while back just to get some small scratches out and the machine shop told me to use stock size bearings, so i did and the clearance was about .0025-.003" this is too much and because of it my oil pressure is pretty low at idle (about 29psi) my advice is to get your crank ground .010" under and get .010" under bearings to get it closer
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NMRA O/C 9516 NA pumpgas stickshift 347 10.65@125.6, 6.73@100, 1.41 60ft |
01-25-2002, 11:21 PM | #10 |
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perfecto
Now I understand. thank you very much |
01-26-2002, 03:19 AM | #11 |
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Just so I'll feel better;
0.0000 = No clearance 0.0010 = A little on the tight side 0.0015 = Preferred 0.0020 = Your Max limit 0.0025 = Loose 0.0030 = Way too much clearance Take care, -Chris
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01-26-2002, 03:41 AM | #12 |
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now im convinced that my method of checking the clearance its way off.
I'm going to go ask for another type of plastigage |
01-26-2002, 04:12 AM | #13 | |
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Quote:
Take care, -Chris
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01-26-2002, 07:44 AM | #14 | |
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