So I know it's been a while, but I wanted to give an update. After I disassembled everything I took all the parts to the machine shop. After he went through some checks he found 2 issues. First, that my manual I was using had the wrong main cap torque spec listed. Any other IDI manual as well as any of the specs available to him show that the main bearing torque should be 95 lbft. The manual I followed during assembly had 95 lbft plus an additional 95 degrees listed. We believe this additional torque was deforming the main bores and giving the odd bearing wear. To correct this he redid the line bore at 95 lbft and that will be the spec I use on assembly. Now that still didn't explain my shake I was having. He didn't believe it was a balance issue because he said if it was it usually leaves "stripes" on the rod bearings as well. He did respin the rotating assembly to verify it was ok though and it was very close and within what he normally aims for in street motors he builds. He did hone it in even a little closer though.
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What he did fine and believes to be my shake was a leaking intake and exhaust valve. Keep in mind he didn't go through the heads previously because I had bought these already done elsewhere. He double checked the heads and fixed the valves that weren't sealing for me. So that brings me to where I'm at with it now. I've been slowly plugging away with assembling and checking everything twice. I reinstalled the crank and checked clearances with STD bearings. Clearance ranges from .0025in to .003in. I was hoping to be a little on the tighter side but they are within the spec .0011-.0038in. I've been slowly installing the piston and rod assemblies too.
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Initially I used STD bearings here too, but I was at the high end of the spec at .0035in. Spec is .0011-.0038in for rod bearings as well. After talking with
@typ4 he had some old stock .001 undersize bearings that he sold me. So far I've got 6 of the 8 pistons in and they brought my rod bearing clearances down to .0015-.002in right where they should be. If anyone is rebuilding an engine I highly recommend you get ahold of him and get a set for yourself especially if the crank has been polished!
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So this brings me to a few things that have been running through my brain lately. First, I modified my intake by cutting it down to make turbo removal, installation, and just plain turbo clearance better. Since I've done this it got me to thinking about coating the intake. Is it worthwhile? Normally we just bead blast them and clearcoat them, but the spray bomb clear doesn't always hold up the best to oil and fuel. Anyone else have any better options that won't break the bank? Also I've been thinking about changing my crankcase venting. Right now I'm running a road draft tube, but it's annoying to have the smoke drifting out from under my truck at red lights. I've been looking at my options here too. I found the Donaldson Spiracle systems that look promising. Anyone else have any suggestions?
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