Jason's 1987 SAS'd truck gets Nitro 529 gears/Harrop in a Marlin HP Diff Housing |
---|
(72 BIG pics loading) |
AUGUST 19 2018 |
Jason's lives up in Oregon where they have a lot of the white stuff in the winter time. |
---|
It was time to upgrade the front to a bare High pinion 8" from Marlincrawler.com and install a set of Nitro 529 gears and Harrop electric locker. |
Empty Marlin housing on the left...the Nitro V6 master kit.....the Harrop Elocker....529 Nitro gears and the solid collar/dual drilled flange. |
They chamferred the circumference of the V6 wheel adjusters which was much needed. |
Parts are unpacked and layed out. All looks to be here. |
The big inner pinion race is tapped in.....360 degree support, of course. |
Same with the small outer race. |
Will start with a .076" pinion shim. |
The pinion loading station. |
Tighten the pinion nut til the estimated preload is somewheres in the neighborhood of 10~20 ft/lb. This is only a pattern check so it's not critical. |
Now onto the other end. A quick check of the coil resistance of the electro-magnet. Measuring about 4 ohms. |
Surfaces were checked with a file and all was just fine. |
75 ft/lb and blue loctite. |
The new Koyo carrier bearings were a very nice tight fit onto the journals. |
The top bearing cap has to slide on horizontally first and then the 2 long bolts go in. |
Line the threads up...tighten the 2 bolts....and then thread the large wheel adjuster in. Then dial in some bearing preload and backlash. |
First paint check and way too deep. This is the drive side. |
Coast side. |
Teardown and now trying a much thinner .034" |
Drive.....much better but over-shot just a little. This is slightly shallow now. |
Coast....can't complain. |
I did notice that the 529 ring gear was so thick that the teeth were almost hitting the tunnel groove so did some clearancing with the flapper wheel. |
Took about 20 seconds..... |
.................................. |
A final look at the pinion paint shows that the comet tail is too deep into the root and that means to add more pinion shim. |
,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, |
So now to increase the thickness by .004" Now trying .038". |
Repaint.....Drive side....beautiful. |
Coast....very nice indeed. |
Final confirmation....pinion tooth....comet tail is starting to feather out to the center. That means to leave it alone and button it up :) |
;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
//////////////////////// |
Now to set the solid collar in place....took about 7 tries on this Hi-pinion to get it right. |
3 adjustments on pinion depth...... |
7 on the solid collar. |
The 27 spline fanblade slinger will fit with a slight enlargement of the center hole. A Makita 1/4" die grinder and 3 minutes did the trick. |
Grease on the garter spring prevents the spring from popping off during the install process. |
The Yukon brand seal appears to be a quality seal. |
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
============================= |
The new flange is next. |
Anti-seize on the flat surface...not shown but also applied to the pinion threads. |
All that anti-seize really helps in dialing in the pinion preload. |
This side goes together like usual. |
This side requires a little order of assembly as mentioned earlier. |
The 2 long bolts are tightened and the wheel adjuster freely threads in. A quick final check of the locktab freeplay shows 1 mm. |
The wheel adjuster threads in smoothly. |
Now the 4 bolts are torqued to the 70 ft/lb spec. |
Bearing preload is set/measured at 6 in/lb (as measured from the pinion flange end). Backlash is recorded on every other tooth for 20 measurements. |
A small amount of rtv is applied to the rubber grommet. |
The rubber grommet now pushes thru about 3 times easier ;) |
;;;;;;;;;;;;;;;;;;;;;;;;;;; |
10 inch/pounds with Loctite |
3.9 ohms of resistance. There is no Harrop spec on this but it seems to be a very common number. Ohms Law says that with 16 volts and 4 ohms that the amperage will be 4 amps. So, the reality is, the Harrop only draws about 3.5 amps on a good day. |
This is my Sealed Lead Acid battery that has served me well for a number of years. |
12 volts is applied to the 2 wires....no particular polarity. |
The locker is not "active" until the 3 pins start to recess into the holes....the driveshaft has to turn a small amount. |
The ring gear has to turn a small amount..... causing the pins to recess in as shown. |
Locker fully engaged. |
Additional turning of the ring gear causes the grey ramp ring to move with the pin. |
Now remove the 12 volts............. |
...and the ramp ring snaps back into place due to the strong internal spring on the other side of the pin. Locker is now unlocked. |
Basic specs are inscribed. |
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
This is the harness. |
The recorded notes. |
Sure is a pretty High pinion 529 Harrop 3rd |
:) |