packinkimber45
15+ Year Contributor
- 379
- 2
- May 26, 2006
-
Boise,
Idaho
Hey everyone. I decided since my motor is already out and my oil pan is off anyways that I should replace my main and rod bearings as precaution and insurance. I am replacing it with oem bearings. I have a few questions. First off what should I have the machine shop do as far any work to the crank and inspections. Never done this before and I want to do it right. Magnafluxed/micro polished/and check measurements? When I plastigaged the main bearings most of them were .0015 in. and one was like .002 inch. Does this mean I just need to order standard size bearings? When I did the plastigage I just simply took out the lower bearings/cleaned off oil on bearing faces and journals. I did not take the crank out to clean the other side of the crank journals and the upper bearings, should I have done this? How about where the bearings mate to the block, do I need to clean off any oil in between there too? Run a tap in all the threads so it doesnt affect my torqueing? Also I know the torque sequence, but when taking the bolts back out do I go reverse of the torque sequence for the main caps or same sequence of install? Like I said I have never done this type of procedure before, when I check my rod bearings is there anything I need to know before I loosen the nuts on them? Such as pistons will automatically drop towards the head, crank needs to be tdc/bdc/turned so rods are on sides of crank? Do I need to support the rods while I am taking them off so they dont just fall down the cylinder towards the head? I have done a lot of reading and searching, not much info I found. When installing the bearings permanently should I use engine oil or assembly lube, manual states engine oil but I read people using assembly lube, what are the pros and cons to both? Also do I lube the back side of the bearings that mates to the block and main caps, or just the parts that contacts the journals? This is all overwhelming sorry for the long post. Thanks.