torque wrench and piston question
That sounds sooo cool... the four biggest things on using a torque wrench and building reliably...
1. Take care of your tools. Clickers should be released before puttin git down. Every time. And "put down" does not every mean "drop". If it hit sthe floor, or slips and doesnt get placed down, have it calibrated. A good torque wrench will last a very long time. Beam types most accurrate, and hardest to use(DAMHIK). Dial types are very close to beam types for accuracy, and just as hard to use. Clickers are the last.
2. If it's got threads in it (any hole, iron, aluminum without inserts..) use a bottoming tap during the block washing process. In every hole..heads and mains are important, but if you've ever tried to use the tips of 2 fingers threading in the lower bellhousing bolts on a Dart, you'll appreciate how much easier the bolts go in...lol). Tap the holes, then blow them out with solvent and compressed air. All bolts being reused shoule also be run thru a die to make sure the threads arent buggered. Head bolts, and main bolts especially. The tumblers some shops use to clean them can roll threads slightly, so the torque indicated is not correct.
3. Use the correct lubricant on the fastener and go in proper sequence. ARPs use ARP moly lube. Factory fasteners use 30W oil. The specs vary for different lubes. Most websites have the info if you know the part numbers of the fasteners used.
4. Apply torque in steps. You will get 1/2-3/4 of a turn more on a head bolt going in 3 steps, and ending with the same load. I know many with seeping steel headgaskets that dont do the steps...Smooth and steady, no hard jerking the torque wrench.
Notes: Aluminum heads should always be re-torqued after they have been run a few times. most times you'll find a few that are below torque value after some heat cycles. Studs are meant to be threaded by hand. You dont need to crank them in tight with vice grips or the allen wrench. finger tight, then torque the nuts, and dont forget to use the right lube between any nuts, bolts heads, and washers too. Not just the threads. Keep a written record of when you tighten every fastener. A note jotted down with greasy fingers will give you peice of mind if you need to stop and then come back to it.