hello, i got a crank from a good machine shop that mic'd the crank and said it is still std. but to use .001 bearings on it. i think that is just for the rods. so i did and put it in my other block. it has been a good while,over a year since i turned the motor by hand. i do not remember if i could or not without using a wrench. now i got a different motor that i decided to change the crank and bearings on. so i took the crank out of the old block along with the good never used bearings. i put them in this new block and now i can only turn the crank with a wrench.(remember that i can not remember if i used a wrench or not but i think i did.) i torqued the rods to 40 but i have an old torque wrench that only has a pointer on it and i think it is bad now since i snapped a rod stud with less than 40 psi as the wrench said. i am using lube. i plastigauged the bearings again as i did when i put the .001 bearings on with the crank in the old block and it was the same as what i got before. .015 is what it came out to be for rod bearing clearance and i was told this was an acceptable clearance. i did take the rod bearing out and look at them again and no wear, so i am thinking i just need a better torque wrench. i was thinking this is just going to be a tight clearance motor and may need thin oil for a while or something. can anybody help me out here. thanks. the new shortblock i have turned by hand but it also had some moderate wear on the main and rod bearings. i did nothing else but change bearings and crank.
rod bearing clearances using .001 bearings
- Thread starter dastang2
- Start date
it measured out to be .002 of an inch in the main bearings. is this a good clearance.
checked the rod clearance and got .0015 and no taper at all, i heard this is good. is it
this is a post from a different site that i looked up from. maybe it was .0015 of an inch instead of.015 of an inch. i may have forgotten ot misread the sheet of paper that came with the plastigauge. thanks all.
checked the rod clearance and got .0015 and no taper at all, i heard this is good. is it
this is a post from a different site that i looked up from. maybe it was .0015 of an inch instead of.015 of an inch. i may have forgotten ot misread the sheet of paper that came with the plastigauge. thanks all.
retro50
New Member
Are they stock rod bolts? If so then 24 ft lbs. is the torque spec not 40. The clearances are o.k.
65ShelbyClone
Founding Member
.002 on the mains is the happy medium for a performance street engine. Race engines usually have ~.0025 and stock engines are tighter at ~.0015. The rods are about right.
40lbs is too much for the rod bolts. It shouldnt have broken, though. A decent beam torque wrench works fine and they take ALOT of abuse before wearing out. Craftsmans are only ~$30.
40lbs is too much for the rod bolts. It shouldnt have broken, though. A decent beam torque wrench works fine and they take ALOT of abuse before wearing out. Craftsmans are only ~$30.
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