Buddy_M Posted February 3, 2009 Share Posted February 3, 2009 Just wondering if anyone has a different number for torque specs for a Cat 3304NA engine. I'm rolling in mains & rods now and the specs I have written down list 30ft/lbs +90 for both mains and rods, for the 1/2" rods that sounds like its ok, but it just seems low for the main bolts(5/8"). Buddy Quote Link to comment Share on other sites More sharing options...
Damon Posted February 3, 2009 Share Posted February 3, 2009 I checked the 3304 and came up with the same info as you. If you're uncertain about this, post an engine serial #, but it seems to be correct. Media #SEBR0517-00 SMCS #1203-10 30 ft lb +/- 3ft lb +90 degrees. Quote Link to comment Share on other sites More sharing options...
HeuiTim Posted February 4, 2009 Share Posted February 4, 2009 Those are the specs I came up with, post your Prefix just to be sure. Quote Link to comment Share on other sites More sharing options...
Buddy_M Posted February 4, 2009 Author Share Posted February 4, 2009 Got the mains and rods torqued first thing this AM and it was all my 3/4" impact could do for the last bit of that 90* turn on the mains. I got the spec from the AERA Pro-SIS torque spec book. They list either 30ft/lbs+90 or 40ft/lbs+90, I went with the first spec of 30+90. We'll find out after it's all put back together in a day or two and after a few machine hours how it holds together. It'll be nice because I'll get to break it in pushing some snow at my shop. The back story to this its in a 1970's Cat 920 loader, and it decided to swallow the head of the #3 intake valve and crack the piston in half when it decided to stick in the piston. 4 new cylinder kits, reman head, and a couple other parts later she's going back together slowly. Only wishin I would've had a working digital camera to get pictures of the damage... Buddy Quote Link to comment Share on other sites More sharing options...
Damon Posted February 4, 2009 Share Posted February 4, 2009 And if it makes you feel better, a 1/2" bolt torqued to 30lbs+90 degrees is a lesser final torque than a 5/8" bolt at 30lbs+90 degrees...unless of course the 1/2" bolt was coarse thread and the 5/8" was fine thread. Quote Link to comment Share on other sites More sharing options...
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