MrTJ Posted July 17, 2013 Report Share Posted July 17, 2013 Any simple tips on telling if a used crank shaft is in working order? I have an extra one that seems to be in good shape, but I don't really know for sure. The bearing all seem to work well and there isn't any vertical play, though there is some play on the rods when I move it left and right. Is this normal? I was just planning on selling it but I don't want to sell faulty stuff to someone. I bought it a few years ago used from someone and ended up just deciding to put in a new one instead. Thanks Quote Link to comment Share on other sites More sharing options...
sheerider11 Posted July 17, 2013 Report Share Posted July 17, 2013 Have to check the side to side measurement with a dial gauge Quote Link to comment Share on other sites More sharing options...
possum Posted July 19, 2013 Report Share Posted July 19, 2013 i check the rods with a feeler gauge. Quote Link to comment Share on other sites More sharing options...
camatv Posted July 19, 2013 Report Share Posted July 19, 2013 clamp it in a set of v blocks and check the center bearings. most times if the cranks have been run for a while the inner bearings are loose. just replacing the outers with new i'm not to sure how well that works. i have had some come through that the rods were fine but the main bearigns were loose as heck. i just bought a "used rebuilt" 10 mill and the main bearings on it are toast. Quote Link to comment Share on other sites More sharing options...
sheerider11 Posted July 19, 2013 Report Share Posted July 19, 2013 I can't remember the play that the clymers has within spec, but it was a lot more then you would think. Quote Link to comment Share on other sites More sharing options...
spurdy Posted July 21, 2013 Report Share Posted July 21, 2013 I can't remember the play that the clymers has within spec, but it was a lot more then you would think. Side clearance of the rod to the web is 0.25-0.75 mm. Vertical movement service limit of the small end of the connecting rod is 2.0 mm. Assembly width is 53.95 mm - 54 mm of individual web sets. Assembly width of both web sets is 155.90 mm - 156.05 mm. Crankshaft run out is 0.05 mm. SP Quote Link to comment Share on other sites More sharing options...
moparmadman40 Posted August 9, 2013 Report Share Posted August 9, 2013 pretty sure you dicked that up, no way is the radial clearance 2 mm. you might have your side clearance and radial clearance switched around. 2mm between the side of the rod and the crank web maybe, even that sounds high. but then your .25-.75 mm value for the radial clearance seems high. thats 0.007"-0.029". typically the service limit for radial clearance on crank bearings is 0.003" Quote Link to comment Share on other sites More sharing options...
spurdy Posted August 10, 2013 Report Share Posted August 10, 2013 pretty sure you dicked that up, no way is the radial clearance 2 mm. you might have your side clearance and radial clearance switched around. 2mm between the side of the rod and the crank web maybe, even that sounds high. but then your .25-.75 mm value for the radial clearance seems high. thats 0.007"-0.029". typically the service limit for radial clearance on crank bearings is 0.003" Ya, I didn't dick it up. I think you dicked up the interpretation. But that's all good. I never said the radial clearance of anything was 2mm. I said the connecting rod small end free play was 2 mm at the service limit. It is 0.36 mm to 0.98 mm new (0.014" - 0.038"). It isn't 2 mm connecting rod side clearance, it is .25.-.75 as stated which is actually 0.010" to 0.030" which you have pretty close. Happy measuring! SP 1 Quote Link to comment Share on other sites More sharing options...
Starwriter Posted August 10, 2013 Report Share Posted August 10, 2013 Vertical movement service limit of the small end of the connecting rod is 2.0 mm. Here is where the misinterpretation comes from. Should be horizontal. Other than that, good info. Quote Link to comment Share on other sites More sharing options...
moparmadman40 Posted August 11, 2013 Report Share Posted August 11, 2013 Yah, sorry misinterperetation. So what is the proper specs for connecting rod RADIAL clearance? didn't see that anywhere other than what i mentioned. Quote Link to comment Share on other sites More sharing options...
camatv Posted August 11, 2013 Report Share Posted August 11, 2013 unless you have an 06 with very low hours your crank is probably toast.. recently with all the junk ass crap floating around i like to just rebuild OEM's with nice bearings and hot rods rods. Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.