Bearing clearance spec question...
#1
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Bearing clearance spec question...
Getting ready to do the initial assembly of the bottom end of my 525SC...
Will be checking all clearances, & I was looking at the Mercruiser specs...
http://www.perfprotech.com/store/art...fications.aspx
I see that this must be for non HP motors...Should I run the clearances on the upper end of these specs?
.0030 rods & mains (#'s1-4, & .0035 #5)...
The crank was polished & left standard. Block was line honed, not bored. I'm thinking that should not effect clearances much...
Engine will be in the 600HP range, 5600 wot, bearings will be Clevite 77 H series, melling 10778c oil pump, running 20/50w oil.
Thanks for any input on this...
Will be checking all clearances, & I was looking at the Mercruiser specs...
http://www.perfprotech.com/store/art...fications.aspx
I see that this must be for non HP motors...Should I run the clearances on the upper end of these specs?
.0030 rods & mains (#'s1-4, & .0035 #5)...
The crank was polished & left standard. Block was line honed, not bored. I'm thinking that should not effect clearances much...
Engine will be in the 600HP range, 5600 wot, bearings will be Clevite 77 H series, melling 10778c oil pump, running 20/50w oil.
Thanks for any input on this...
#2
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Yes you would want to be on the higher end for clearences. .003 is a little loose on the rods. .0027-.0028 would be good. .003 #1-4 and .0035 #5 are good numbers.
Last edited by PatriYacht; 03-08-2011 at 10:24 AM.
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I just finished assembling 540's for my boat with H bearings. 0.0028" - 0.0030" on the rods, 0.003" on mains with a little extra clearance in the # 5 main.
That is the clearance I use in my darg motors, and they look good for a couple seasons.
That is the clearance I use in my darg motors, and they look good for a couple seasons.