Alright, the next topic in our series of precision measuring and tool usage in care for students in
my manual drivetrain and automatic transmission classes is dealing with high amounts of torque
if you have a manual transmission output shaft nut or a pinion nut that has a crush sleeve that
we need to crush it can take two three four hundred foot-pounds of torque to tighten that
nut or to crush that particular crush sleeve so if you think you're going to do that with just
a like a half-inch drive ratchet that's not going to happen a typical crush sleeve will
take around three hundred fifty pound-feet of torque to start crushing and you should
never ever use an impact gun electric or air power no impact guns you will cause something
called bearing Brinneling so instead, you need to use muscles and brains so right here I've
got a 1 and a 1/4 inch socket that happens to fit a whole bunch of axle piñon nuts and I've got
a 1/2 inch drive ratchet handle here that is I don't know 12 inches long that's only
going to give me a certain amount of leverage to tighten that nut but if I go with a 3 foot long
ratchet then that is going to give me even more leverage as I try to tighten the nut some of
you may have heard of or seen someone else you put a pipe on the end of one of these ratchets
and tighten it up and that's that although I've seen it work I've also seen it break the ratchets
they're not made for that amount of torque and so ratchets that are made for that amount of torque
are the three-quarter-inch drive ratchet sand the one-inch drive ratchet now this particular
ratchet is a 3/4 inch drive ratchet and I've got a 3/4 inch drive socket here to go with
it. it's got a two-foot handle and if that's not enough length then it's got a little button you
push right here take the handle out and you can buy a four-foot handle and put in there and now
you've got a 4 foot 3/4 inch drive ratchet for really tightening something tight and they make
torque wrenches up to three-quarter inch and one inch drive also they have like an almost a
6 foot long handle to go with it to get up into the six hundred foot-pounds of torque and so on
well there's an easier way to tighten or loosen things that are really tight or have a high
amount of torque and that is done with another tool right here called a torque multiplier this
particular torque multipliers from Snap-On it's part number GA184A and this is a four to
one torque multiplier which means it has a half inch drive input and a 3/4 inch drive output
you're going to have to turn this input four times to get one turn of the output so that's the four
to one torque multiplier, they also make a 16 to one a 64 to one and an even higher torque
multipliers now there's a warning label right here a caution label that says maximum output
torque is one thousand foot-pounds the maximum input torque is 275 foot-pounds it has a ratio
of four-to-one but it says allow up to 20% loss in the tool for frictional losses inside the
planetary gearset ahead that we have here so we lose some accuracy it's not exactly 4 to 1 we
lose 20% so at let's say we're going to tighten something to 400 pound-feet foot-pounds 10% of
400 is 40 20% would be 80 so if we subtract 80 from 400 it would really only torque it to 320
foot-pounds rather than 400 that you might think so if we put 100 on the input and expect to get
400 out with a four-to-one torque multiplier it doesn't work like that you'll only get well it
says allow 10 to 20% you're gonna be in a range so the torque multiplier as I said as a planetary
gearset inside of it that gives us a gear a 4 to 1 gear reduction which gives us a 4 to 1 torque
multiplication minus the frictional losses so what we do is we grab the appropriately sized
socket and put on here and then you'll use a half-inch drive torque wrench which I forgot
to bring a torque wrench but a half-inch drive torque wrench to torque it or if you just need
to tighten or loosen something a half-inch drive breaker bar or ratchet and as you turn this as you
try to tighten it these handles are going to want to go in opposite directions so you're gonna have
to hold on tight to both of them as you tighten it but it makes it roughly 4 times easier to loosen
something that's really tight and it makes it roughly 4 times easier to tighten some to a
certain amount of torque with a torque multiplier so if you do much heavy work at all and you learn
that impact guns ruin things and you want to do it the right way a torque multiplier is the way to go!