rebuilding z6: problems with rod bearings
 

i am rebuilding a z6 back to stock. i got the pistons/rods and new rings in, all new bearings. no machine work except for me doing a light hone to bring back the crosshatch.

when i torqued down the # 2, 3, and 4 rod caps the crank would still spin easily (considering the friction of the pistons), but when i torqued down the #1 rod cap the crank will barely spin over. i put them at 23 ft/lbs. i put the torque wrench on the crank and it takes 50-55 ft/lbs to spin

i reset the rod bearing on that cylinder, but still. if i leave it at about 15-18 ft/lbs it still spins easily (considering the friction of the pistons)

ANY IDEAS? Trying to get this thing out so i can start my build

I am at work so i cant post no porn, sorry.

Thanks

motor ran before but rebuilding for a friend cuz it had 230k miles

Re: rebuilding z6: problems with rod bearings
 

are the bearings properly sized or did you just go buy some that "will fit"? Is everything lubricated?

Re: rebuilding z6: problems with rod bearings
 

did you check the bearing clerance????

Re: rebuilding z6: problems with rod bearings
 

I'm guessing he didn't. Plastigage that bearing (might as well check all of them).

Re: rebuilding z6: problems with rod bearings
 

make sure the caps are properly on....numbers on the side of the rods line up with each other, you might have a rod cap fliped

Re: rebuilding z6: problems with rod bearings
 

havnt checked any bearing clearance. everything is lubed. caps are right. i'll plastigauge it and measure the bearings with a micrometer. thanks.

Re: rebuilding z6: problems with rod bearings
 

The how the hell did you decide on which bearing to get?

Re: rebuilding z6: problems with rod bearings
 

acl or king standard bearings.....

Re: rebuilding z6: problems with rod bearings
 

i was lucky and got away with just getting std acl bearings but i plasti gauged everything

Re: rebuilding z6: problems with rod bearings
 

most of the people i have talked to use acl or whatever std bearings (even honda shops)...obviously the correct numbered honda bearings are better but i just plastigauged my std king bearings and it seems good to go