Oil Leaking in Parking Brake (after replacing Speedometer Gear)

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@65swb45 @orangefj45

Is there any explanation for oil leaking from the rear brake other than from the rear seal of the Transfer? I recently rebuilt/replaced the Speedometer gear and o-rings, which is the only other thing that I can think of that might explain why I suddenly have oil dripping out the Parking Brake. The only other explanation seems to me is that the rear transfer seals are leaking, but that can't be because Mark just rebuilt the TC and put double seals in..... correct Mark?



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Is it possible that bits got in there when replacing speedo gear or from previous bad speedo gear and roasted the new double seal ? Is it leaking down backing plate or between drum & drive shaft flange and running down outside of drum ?
Curious, Mark would have noticed and replaced a bad speedo drive so having a rebuilt case and the speedo goes bad shortly after could happen but one would assume the condition of speedo drive was checked upon reassembly, describe the speedo gear damage and did it happen after rebuild ?
 
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Well, first, the oil is leaking from the bottom of the brake drum. I can’t tell where it is coming from without removing the brake drum, which I can’t do without dropping the engine due to my clearance problem. So it’s not a trivial problem to resolve.

As far as the Speedometer goes, i agree that it probably should have been renewed with new o-rings at the time of the rebuild, but since I didn’t specify that, it wasn’t done. It was leaking right off. I had to drain the oil and pull the old gear, which wasn’t any big problem and I bought a new kit from Toyota and put a new gear in with new o-rings. I don’t know how anything could have gotten into the hub and damaged the seals. The whole replacement seemed quite easy and no issues getting the gear back in.

My only thought was some oil might have leaked through when I pulled it. That’s all I can think of that could have happened.
 
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I put some RTV or similar on the splines of the output shaft and brake drum before sliding the drum on...

I don’t “think” it’s coming out of the splines. I was told by Mark that if I sealed the washer at the end of the shaft, it would prevent oil leaking from from the splines. I had that leak before. That is what I did. It was my understanding from Mark that the oil can’t get into the parking brake drum from the splines through the back side of the drum. If it can (can anyone verify?) then it’s possible that is where the oil is coming from. It can also be coming out of the seals.
 

orangefj45

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I just read thru this thread fairly quickly.

Am I correct in understanding that the Tcase was rebuilt?
If so, then the speedo o-rings ( BOTH !!!!!!! ) should have Bern replaced at that time and they are included in every type of rebuild kit I’ve ever come across.

Yes, you should always apply a small snaking of silicone to the splines before installing the drum.

Your leak appears to be stemming from an issue at the rear output seal of the Tcase or at the seal surface on the drum.
How’s the seal surface? Any grooves or putting?

You’re going to have to pull the drum to fix this …..

I’d highly recommend one of our dual-seal rear extension housing kits to correct the issue.

Happy to help.

Georg @ Valley Hybrids @ Cruiser Brothers
Shop 209-475-8808
Sales@valleyhybrids.com
 
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Georg, I really appreciate your input. Yes, it seems to me that renewing the o-rings on the Speedo would have been a SOP, but it wasn’t done. At this point, I either lower the rear of the engine, or relocate the crossmember, to pull the drum.

Since I was able to find a pre-cut crossmember kit that locates in the rear (in that location I discussed with you before), I will call the Fabricator you recommended to me about welding the new crossmember in, then I will have the existing crossmember removed. I think that is the better long-term solution. Once that is done, I’ll pull the drum and do what I can to inspect the seals and give you a call about the “dual-seal rear extension housing kit.”

Thanks for your help!!!!
 
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The preload was already set (presumably) when the gentleman that rebuilt the TC installed the Hub and set the preload on the bearings. I think that is the preload you are referring to.

From my understanding of the procedure, that is a different preload setting from the preload on the drum brake stake nut.

All I did (after installing the rebuilt TC) was bolt the brake backing plate to the hub, put on the brake shoes, springs, etc., hook up the brake cable, push the drum on, and torque the nut, washer and shim.

The speedo cable started leaking right away, leading me to remove the gear and replace the o-rings and gear using the Toyota kit. I reviewed Coolerman’s page and the Mud FAQ on the subject for guidance.
 
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Georg, I really appreciate your input. Yes, it seems to me that renewing the o-rings on the Speedo would have been a SOP, but it wasn’t done. At this point, I either lower the rear of the engine, or relocate the crossmember, to pull the drum.

Since I was able to find a pre-cut crossmember kit that locates in the rear (in that location I discussed with you before), I will call the Fabricator you recommended to me about welding the new crossmember in, then I will have the existing crossmember removed. I think that is the better long-term solution. Once that is done, I’ll pull the drum and do what I can to inspect the seals and give you a call about the “dual-seal rear extension housing kit.”

Thanks for your help!!!!

@orangefj45

Georg, I’m scheduling with Campbell Enterprises to have them install a new crossmember and cut out the Toyota crossmember so I can access the Parking Brake. I’ve spent the last few weeks rebuilding the front disc brakes, do that has been a pacing item. I took it out today after the rebuild (drove a couple blocks) and oil was coming out the brake again. The weird thing is, it’s dark, dirty oil, whereas the oil in the transfer is new, clean fluid. I cleaned the entire brake, and shaft, so I don’t understand where that dirty oil is coming from. It’s almost like Mark (the guy in Burbank that rebuilt the TC) didn’t clean anything when he rebuilt the TC, or at least he didn’t clean the bearing retainer. Where else could the dirt come from?

The problem is, I have no recourse with Mark. He is not a legitimate business person who stands behinds his work,l (IMO) and he is extremely difficult to deal with, especially as I am in Arizona. I’m not going to pull the TC and take it back to him, so I’m basically screwed.

Let me know if you have any thoughts about what might be going on, otherwise I’ll contact you again when I get the crossmember moved and the Parking Brake off so I can get in there and try and see what is going on.
 

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