CTX-SLPR said:
Howdy,
I did the initial assembly, didn't torque the mains down all the way, just to 25ft lbs and check the thrust after beating the crank back and forth with a rubber mallet at 12ftlbs and then again at 25. With a screwdriver wedged between the crank throw and the thrust cap I got .005" end play.
I check my roller cam thrust and its at .011" with all the shims I have for it. Should I worry about .001" on the roller or is this close enough. I also swear that I didn't get any torque values for the head studs from TA when they shipped them. What is it with ARP Moly lube?
Thanks,
ARP packages this lubricant with every internal engine fastener kit they sell. I am going to share with you my opinion on why they do this. First of all ARP is way ahead of many others when it comes to designing and making high quality fasteners.
I am going to simplify this next statement. When something is designed to be clamped together using bolts, an Engineer determines the amount they want the bolt to stretch for that application. This varies depending on the alloy, the thread type (rolled threads, cut threads, etc.), diameter, locking features (crimp style lock nuts, Teflon lock nuts, etc.), length, moments of inertia being exerted, etc. Next they determine a quick repeatable way to get the fastener to stretch to the desired yield in a manufacturing environment. One of the ways is to call out a torque value. Some applications have a tighter tolerance because they are more critical. (Example bolting the fender to you car has a wider tolerance than bolting together the components of the landing gear for a 747.) If most Engineers had their way they would measure how far the bolts stretched when they were installed, and document how far to stretch them for each application, but they don’t get their way, so they are forced to call out torque specs. Which are not as accurate as measuring how far it stretches. Because of this, most designs are over engineered to compensate for this level of inaccuracy.
The ARP lubricant is very slippery and greatly reduces the amount of friction necessary to stretch a bolt to its desired length when it is properly installed. ARP knows what the application is for the fasteners they are selling you. By providing you the ARP lubricant they can more accurately tell you how far to torque fastener, because they have eliminated what you might, or might not use for a lubricant from the equation. When they state the torque specs for their fasteners, it stated what it should be using ARP molly lubricant. They also tell you what it would be if you used 30 weight motor oil which is no where near as consistent as ARP molly lube.
I am sure someone will disagree with me, so I have promised myself I will not reply to this subject on this thread any more. This is only my opinion. When I rebuild an engine using ARP fasteners, I use their recommended torque specs, and recommended lubricant. Now everyone knows why.
Sorry to ramble, but this is a touchy subject for me.