4AGE: DIY: 4age distributor rebuild.

[assassin10000]

Here's another one of the write-ups that I've made that crosses over with the mk1 mr2's

Andrew

Original thread can be found here: Club4AG Forum Topics: DIY: 4age distributor rebuild.

Ok, a couple weeks ago I had the bearing sieze in my Toyota Corolla (ae86) 4age/4agec distributor. A more common problem is the inner shaft seal in the distributor going bad and oil leaking from the distributor. This write-up will fix both issues.

I then remembered cruising one of the tech forums (dorikaze - IIRC) that said there was distributor rebuild kits available for the 4age distributors. They had previously been marketed towards the AW11 MR-2 crowd, and not the AE86 Corolla guys. Fortunately I was able to search and find the company that carries the rebuild kit - KBOX in Canada http://www.kbox.ca . So I go ahead and order a kit up to repair my fried distributor.

In the mean time I swapped in an AW11 distributor to keep the car rolling. Which can be seen in one of my other posts, it's a direct swap. See post here:
OEM Distributor w/Heatshield for an AE86...

Anyways, here's what to do.

1. Remove distributor (and cap and rotor). If you need pics for this, you shouldn't be attempting it

2. Drill out the 'roll pin' from the distributor gear to remove gear from the distributor shaft.

This is kind of a tricky PITA, type of deal. Since the OEM pin used is mushroomed into place, you need to carefully remove the mushroomed part of the roll pin with a drill bit that is actually larger than the part of the pin inside the shaft/gear itself. Without eating into the distrubutor gear.

Once that portion is removed you need to drill out the remainder of the OEM roll pin with a small drill bit. NOTE: do NOT go larger than 1/8" drill bit, that is almost TOO large to drill out the center. I'd recommend a 3/32" bit. Then you take a small punch and knock the remainder of the pin out of the gear/shaft. From there it should be relatively easy to slide or pry the distributor gear off the shaft.



3. Loosen the screws for the distributor shaft/bearing retainers. If your having trouble getting them with a regular screw driver (and you really don't want to strip the heads of these) I'd recommend giving it a light whack with an impact screwdriver. That's what I did.



Once loose it's a cinch.



4. Now that the retainers are gone you should be able to slide the distributor shaft/stator assy out of the housing with ease.



5. Now that it's out, you need to remove the shaft seal from the center of the housing. It should look like this once removed.



6. At this point your going to need a special tool or two. Either access to a small press, or a pulley and small bearing puller/splitter set.

Set the bearing up for removal, and pull/press/push the bearing off the shaft.



7. Grab your rebuild kit.



Here's a close up of the contents.

EDIT: the smallest o-ring is for one of the electrical connectors on the distributor.



8. Install the new distributor shaft seal. I used a 14mm socket and lightly tapped it into place with a hammer, I set the housing upright on a 2x4 to prevent damage to the housing itself.

The top of the seal should sit level with the bottom of the bevel of the housing opening.



Tip: get a drop or two of ATF and wet the seal down, it really helps when it comes time to install the distributor shaft.

9. Install the new bearing. I found that if you grab a seatbelt bolt from the front seats, it has a 1/2" thick or so spacer that works perfect as an arbor to press directly against the center of the new bearing. Just set that on top of a fender washer and push the bearing up into place.

If your uncertain of how far to press it. You can simply remove the shaft and check to see how much further you need to press it by checking where the stator on the distributor shaft sits in relation to the pickup/hall effect sensor/electronics inside the distributor housing. It should sit centered over the sensor strip.





10. Now that the bearing is on the shaft, reinstall it along with the bearing/shaft retainers. I tightened mine back up with a light application of the impact screwdriver.



11. Install distributor gear.

Position the distributor shaft/stator as seen here. The top stator should point just to the right of the sensor. This is the proper position to line up the distributor gear and housing marks correctly.





Now that it's lined up, time into install the roll punch. I started it with the hammer, then drove it into place with the punch. It will stick out both sides of the distributor gear, just make it an even amount.



12. Install the new housing to cylinder head sealing o-ring. Cut the old one off, most likely its super hard/brittle from heat. There really isn't much of a point to trying to remove it with a pick.



Don't forget to lightly oil the o-ring when your reinstalling the distributor housing to make life easier.


Done.

[chuyjmv]

Very,very,very helpful!! I recently had my distributor out,& ended up reinstalling it due to not being able to remove the old gear dowel! I drilled one end, then attempted to punch out the rest of the dowl,then I proceeded to put it on a press,bending the driver!

[masagsxr]

Thats a cool writeup!!! Need to forward it to my bro for his AE86

[kfank]

Thanks for detailed instructions and photos! I just performed the operation for my '89 SC MR2. As noted, the difficult part was getting the gear off the shaft. I followed the instructions and drilled all the way through the pin, but found I ended up off center. Fortunately I was still within the pin and didn't damage the shaft. It took heat with a punch to get the pin out. However, having a hole in the pin did not help things IMO. If I were to do this again I would just drill off the mushroomed portion and then go after it with a punch (and any required heat).

Even so, I found it difficult to know how far to drill down to take off the mushroomed end.

BTW, my distributor was a little different than the one pictured, but you get the idea.

[toyotaspeed90]

you should include that in one way or another you should mark the shaft/gear to ensure you don't accidentally put the lower gear on 180* off.

[Bigbacon]

so glad I sent mine out to get cleaned/redone for like $60 bucks. as nice as that write up is, I didn't want to mess anything up and left it to someone who has done it countless times.

[SoFloMr2]

Originally Posted by Bigbacon

so glad I sent mine out to get cleaned/redone for like $60 bucks. as nice as that write up is, I didn't want to mess anything up and left it to someone who has done it countless times.

Who'd you send it to? I need to get mine re-done too and I'm not sure if I should do it myself, don't want to screw something up

[uncledevo]

Check out RockAuto.com for your MR2 MK1 parts. They have a good selection and a rebuild service as well.

[supraguy@aol]

Just did this job, using the same rebuild kit.
Was easy, with the exception of drilling out the punch pin.
It just took a little longer, but there were no problems.

[assassin10000]

Glad it helped some of you guys. I forgot I posted this here... I should probably add a subscription to my own thread .

Andrew