|Tony's 1984 4Runner front Hi-Pinion gets a Harrop elocker and Nitro 488R gears|
|(68 BIG pics loading)|
|JAN 6 2018|
|Tony has the first year of the 4Runners....1984....a classic year.|
| The rear was retrofitted with the Factory elocker a couple years ago.|
Time to upgrade the front to a Harrop e-locker now.
|This arrives from Colorado....a very well packed high pinion 3rd.|
|Tony did a nice job of getting 99% of the oils and caked on grease/dirt off.|
|I'm still waiting on the Harrop but can still do some preparation of his 3rd.|
|The hi-pinion 3rd he sent me still had the original 410 gears and they paint ok. Some out of place wear but not too bad.|
|So every thing was taken out....including the old pinion races.|
|A general wipe down.|
|Let's put the new races in.|
|Tapped in very nicely.|
|The large inner race took a little more care and attention but once it was started true and straight then it would go the rest of the way easy.|
|BAM! 360 degree support all the way around the lip of the race..|
|Careful examination of similar 488 gears in the past and thought it would be best to try .073" as the first try.|
|Pressing on the new Koyo bearing with the shim.|
|Now to mount the pinion into the 3rd.|
|And about the last thing I can do now without the Harrop is to drill the 29/64" hole for the grommet.|
|So, I drill it in the outside shop...drill chips fall away from the pinion like the picture shows.|
|So now it's back in the fixture and little else that can be done without the Harrop....when a truck pulls up to my front door.|
|What timing. It's the Fedex truck and they dropped off 5 boxes for me....one of them was Tony's Harrop :)|
| The Harrop is pretty well secured. I should point out the this model 9334 fits a ton of Toyotas that have the very common 4 cylinder 8" |
or the V6 8" 3rd. It fits 79~85 pickups and 84/85 Runners front and rear applications.
It fits the rears of the 86 thru 95 pickups/Runners.....and a bunch more.
|Time to load the carrier bearings and 488 Nitro ring gear onto the Harrop but first to check the surfaces for anything unusual.|
|All was good so the plastic hammer easily tapped the ring in place. It was more of a slip fit which is the way I wish all my rings went on.|
|A little blue Loctite and 70 ft/lb.|
|Nice, tight fit onto the journals.|
|The Harrop is ready.|
|I had to bend the 2 stop tabs out with a crescent wrench....just enough to clear the bearing cap.|
|Just enough to clear the bearing cap.....|
|...this one also.|
|Now the cap slides in perfectly|
|Then the 2 bolts can be tightened finger tight and the big adjusting wheel can be screwed in.|
|The free-play of the stop-tab was checked and it was 1.2 mm. The book recommends 2 mm which will be easy to do later on.|
|Backlash was adjusted and the preliminary paint test was exceptional. The drive side appears to be the desired "slight deep" condition.|
|Coast was centered and showed good depth from face to flank.|
|The comet tail looks ideally in the center.|
|The other tooth agrees. It says the depth of the ring gear patterns are deep enough and not to go any deeper.|
| With pinion depth established now the solid collar can be installed. Collar length plus shims should be around 1.866" |
so let's try .050 and see what that gets.
|Not bad....that resulted in 10 in/lb of preload with the pinion nut moderately tight. Add .001" to the shim pack and we are done :)|
|The fan blade slinger was designed for the smaller 27 spline pinions....will not fit over 29 spline pinions.|
|A 1/4" die grinder and 3 minutes of targetted grinding....|
|...and the slinger will go down.|
|The pinion seal was upgraded to the genuine oem "29 spline seal".|
|BH6832E and that is how you know it genuine.|
|A light coating of grease over the garter spring...|
|And then the new dual drilled flange is installed....with a light coating of gear oil on all related rubber surfaces.|
|A nice, smooth 10 inch/pounds of pinion prload is measured.|
|The stop tab on the left was tweaked just a little more outwards and then the bearing cap was slid in sideway and the wheel was threaded in place.|
|And now, when I measure the play, I see 2.1mm. This is not a critical measurement.|
|The 4 bearing cap bolts are torqued to the 70 ft/lb spec.|
|Black rtv was applied to the rubber grommet and it was pushed through.|
|Looks good. 1 inch of black wire showing.|
| Adjuster wheel are cranked tight and the backlash was recorded on every other tooth. The average low value was a good .007". |
The carrier bearing preload checked in at a solid 7 inch/pounds.
| One last final paint and the drive side looks slight deep. It is favoring the coast a little|
but very little can be done to move that.
|Coast looks super....and is in the center to boot.|
| These basic elocker tests are probably not done my most. Doing a resistance check and a visual check is so easy so why not? |
Here, an ancient Micronta analog meter is used to measure the "ohms".
|Here, a worn out 12 volt SLA battery powers up the elocker with barely 3 amps.|
| The grey electro-magnet ring on the right "attracts" the ramp ring to the left of it and holds it firmly in place |
while the ring gear side of the Harrop rotates and causes the 3 pins to pushed in.
|Satisfied with everything, now the 2 lock tabs can be torqued to 10+ ft/lb with blue loctite.|
|Recorded on the ring gear.|
|A shot of the Harrop harness they supply.|
| The nice looking REAR ELocker switch supplied on the left and the optional factory oem switch on the right.|
Nothing wrong with the Harrop switch for sure.