Solid pinion spacer question
- Thread starter 5uprahboy
- Start date
I have access to a press. I tried pressing the old front pinion bearing off and after cranking a LOT of pressure on it, I was worried about breaking something, so I resorted to a sledgehammer.
Perhaps the newly pressed on front bearing won't be such a tight fit on the pinion shaft and pressing it off wont be so hard.
Cheers!
Hunt
Perhaps the newly pressed on front bearing won't be such a tight fit on the pinion shaft and pressing it off wont be so hard.
Cheers!
Hunt
Ok - mostly all done. Have installed all bearings - including pressing the pinion bearings on. Naturally the pre-load wasn't quite right first time so will have to take it off and re-shim it.
I do worry that pressing the front pinion bearing off the pinion could damage it though?
It wasn't awfully tight to press on - but still took a decent amount of force...
I do worry that pressing the front pinion bearing off the pinion could damage it though?
It wasn't awfully tight to press on - but still took a decent amount of force...
How much are you changing the shim stack per try?
Usually takes a couple big changes to fall within 10-15 in/lbs.
From there you want to make very small changes < .001"
Torque the pinion nut to a minimum of 150 ft/lbs & measure the preload with an in/lb wrench.
If you don't have one, find one or buy one, without it you are shooting in the dark.
Not really much to it beyond that, have to use a calculated systematic approach.
Usually takes a couple big changes to fall within 10-15 in/lbs.
From there you want to make very small changes < .001"
Torque the pinion nut to a minimum of 150 ft/lbs & measure the preload with an in/lb wrench.
If you don't have one, find one or buy one, without it you are shooting in the dark.
Not really much to it beyond that, have to use a calculated systematic approach.
as suggested, inch pound wrench is the only really way. One with a dial on it is best since you meausre moving tq, not the break away tq to get it spinning.
So the OP doesnt get confused, if he is recording breakaway tq and rolling tq, what is he aiming for when he is dialing in the spacers for the tq value given? Is the tq spec breakaway, or rolling?
Ive only ever recorded rolling tq, and used the speced tq value to that.
Ive only ever recorded rolling tq, and used the speced tq value to that.
OK. Supra 3rd members must be a little different. I have only setup Toyota truck carriers, chevy carriers and ford carriers, and each time Randys Ring and Pinion stressed rolling tq on the bearing.
Sorry if I confused anyone.
Sorry if I confused anyone.
Pinion Preload is only for the Pinion Bearings.
Total Preload is referring to the Carrier Bearings only.
They should have re-worded it IMO.
So the reading you get from the total preload is actually the pinion + the carrier combined, since you are turning both at once.
Just subtract the pinion preload numbers from the total preload to calculate the carrier preload.
Hope that clears up the mud.
Total Preload is referring to the Carrier Bearings only.
They should have re-worded it IMO.
So the reading you get from the total preload is actually the pinion + the carrier combined, since you are turning both at once.
Just subtract the pinion preload numbers from the total preload to calculate the carrier preload.
Hope that clears up the mud.
I'm a little confused to the TSRM's wording lol
RA-25's reference of 'check front bearing preload' assumes the diff is assembled, so you're checking both the pinion and carrier bearing preload combined? Which is why it's a higher 1-1.6nm?
Then what is the 'measure the drive pinion preload' at starting of 0.5-0.8nm referring to? Is that just the pinion bearings on their own, i.e. you would test this without the carrier/ring gear in place?
Thanks!
RA-25's reference of 'check front bearing preload' assumes the diff is assembled, so you're checking both the pinion and carrier bearing preload combined? Which is why it's a higher 1-1.6nm?
Then what is the 'measure the drive pinion preload' at starting of 0.5-0.8nm referring to? Is that just the pinion bearings on their own, i.e. you would test this without the carrier/ring gear in place?
Thanks!
Honestly they really messed up the manual IMO.
ONLY use pages RA-35 - RA38 for setting preload.
They make much more sense, since the carrier is removed from the case when they spec the pinion bearing preload.
Make sure you notice the difference between use and new bearings as well.
ONLY use pages RA-35 - RA38 for setting preload.
They make much more sense, since the carrier is removed from the case when they spec the pinion bearing preload.
Make sure you notice the difference between use and new bearings as well.