Author Topic: How common is tranny main bearing seal leaking?  (Read 2973 times)

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Offline les

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Re: How common is tranny main bearing seal leaking?
« Reply #25 on: December 18, 2019, 01:29:31 PM »
My stock 2002 5 speed went 48,000 miles and never a problem except a slight weep at the shift shaft seal (Mobil 1 75w-90 entire time). When I installed my complete SE OD6 I found the IPB race had walked and was just touching the main drive gear seal. Wasn't leaking yet.

Last Saturday, did a 400 mile day, all good as usual. Go out Sunday and good size puddle under the primary! 14,000 miles on the new SE OD6 :angry: It's tranny fluid, coming off the outside edge of the front pulley whether on side stand or up straight. Oh well, in I go next week. The SE has been great, just wonder what is leaking and what was the cause. I did install a S&S tapered race before I installed it. It's always something.

One note, last two times I went out, after riding and pushing around the garage the belt was making a rubbing sound from the area of the front pulley :scratch: Belt tight as usual after riding. Checked the tension and it was spot on. Interesting to see what I find.

By the size of the puddle, that looks like one of two things.  Either the race walked in far enough to damage the 5th gear seal, or the pulley nut is loose and it's leaking around the quad seal.  Either way, it's all in the same area.  Yes, it's possible that there is a leak between the large seal and the pulley spacer, but the other two are more common.

Offline klammer76

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Re: How common is tranny main bearing seal leaking?
« Reply #26 on: December 18, 2019, 05:10:45 PM »
My stock 2002 5 speed went 48,000 miles and never a problem except a slight weep at the shift shaft seal (Mobil 1 75w-90 entire time). When I installed my complete SE OD6 I found the IPB race had walked and was just touching the main drive gear seal. Wasn't leaking yet.

Last Saturday, did a 400 mile day, all good as usual. Go out Sunday and good size puddle under the primary! 14,000 miles on the new SE OD6 :angry: It's tranny fluid, coming off the outside edge of the front pulley whether on side stand or up straight. Oh well, in I go next week. The SE has been great, just wonder what is leaking and what was the cause. I did install a S&S tapered race before I installed it. It's always something.

One note, last two times I went out, after riding and pushing around the garage the belt was making a rubbing sound from the area of the front pulley :scratch: Belt tight as usual after riding. Checked the tension and it was spot on. Interesting to see what I find.

By the size of the puddle, that looks like one of two things.  Either the race walked in far enough to damage the 5th gear seal, or the pulley nut is loose and it's leaking around the quad seal.  Either way, it's all in the same area.  Yes, it's possible that there is a leak between the large seal and the pulley spacer, but the other two are more common.

Hey les. Wound up being the pulley nut was loose. S&S race so no walking. Replaced with all new seals, new spacer & 3 guyz nut, red loctite on threads and smear behind the nut. We shall see. Not 100% sure of the cause fornut losing clamping force. Socket head bolt was intact on the super nut.

Offline les

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Re: How common is tranny main bearing seal leaking?
« Reply #27 on: December 23, 2019, 09:33:35 AM »
It's nothing wrong you've done, IMO.  That damn pulley spacer seems to sometimes collapse, and the result is the stack gets loose.  Sounds like you've done a good repair and I'm betting no problems from here.

Offline TN

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Re: How common is tranny main bearing seal leaking?
« Reply #28 on: July 26, 2020, 04:54:03 PM »
Another baker main seal leaking, installed dd7 last year with around 15k miles on it. Installed the timken bearings set on the low end of specs, used the white spacer to set endplay. I did ignore it for some time but it was time to address it, what a mess, did not pull the gears as everything seemed fine except for the leak. I tightened the sprocket nut per service manual vs baker instructions this time and final crank to 45 degrees. I'm just a parts changer but getting plenty of on the job experience lately.  :kick:

 All buttoned up and ready to ride.
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Offline les

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Re: How common is tranny main bearing seal leaking?
« Reply #29 on: July 27, 2020, 07:46:47 AM »
So, the DD7 comes with the Grudge Box bearing as part of the kit, or did you add that?   When you replaced the seal just recently, did you also use a new Baker pulley spacer?  Just to be clear, are you saying that the Grudge Box bearing had 15K miles on it when it started leaking?

Offline jmorton10

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Re: How common is tranny main bearing seal leaking?
« Reply #30 on: July 27, 2020, 08:24:38 AM »
Before switching to a grudge box I had a dd7. At that time, the dd7 did not come with the gb bearing although I believe they do now.

~John
« Last Edit: July 27, 2020, 08:37:57 AM by jmorton10 »
HC 124", Dragula, Pingel air shift W/Dyna Shift Minder & onboard compressor, NOS

Offline TN

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Re: How common is tranny main bearing seal leaking?
« Reply #31 on: July 27, 2020, 08:53:06 AM »
So, the DD7 comes with the Grudge Box bearing as part of the kit, or did you add that?   When you replaced the seal just recently, did you also use a new Baker pulley spacer?  Just to be clear, are you saying that the Grudge Box bearing had 15K miles on it when it started leaking?

The DD7 did come with the timken bearing main drive gear by request and a few dollars, I didn't replace the spacer but did put a new oring on the end that came extra with the kit, the spacer looked fine no grooves but I could tell where the seal was riding. On hindsight I do wish I got a new spacer but too late now. And yes to failing at 15k miles. My factory seal made it 58k+ miles as I saw about the TT-391.

Anyhow I just wanted to put mine on the list, I inspected the bore and old seal but saw nothing out of sorts. I hope the issue is solved, I hate messing with that sprocket nut. I've got 75miles or so on it since the repair. We'll see.
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Offline les

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Re: How common is tranny main bearing seal leaking?
« Reply #32 on: July 27, 2020, 10:34:17 AM »
Thanks for that reply.  It seems that when we see this failure, it happens in the range of 15K-20K miles.  Not a happy situation and concerns me.  I have an extra new set of seal, spacer, and o-ring hanging on the wall of my garage, just waiting for it to leak again, but that won't be for another 10K miles at least because my last fix was about 4K miles ago.

I've also seen where one lip of the seal rides to close, and perhaps over, the edge of the spacer.  Mine did not do that, as the two wear marks were fairly centered towards the middle of the spacer when I took it apart because of the last failure/repair.  I've resigned myself that this WILL happen again.  Just a matter of time.

Offline les

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Re: How common is tranny main bearing seal leaking?
« Reply #33 on: July 28, 2020, 10:05:05 AM »
A picture of the wear marks on the one that leaked in 20K miles.  So, this one was not due to one lip being too close to an edge.  Maybe Baker should stop anodizing their spacers?

Offline autoworker

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Re: How common is tranny main bearing seal leaking?
« Reply #34 on: July 31, 2020, 06:09:21 PM »
Good old Baker.Lots of great ideas with proven results.
It must be true,I read it on the internet.

Offline les

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Re: How common is tranny main bearing seal leaking?
« Reply #35 on: July 31, 2020, 07:42:41 PM »
Generally, I've been happy with the Baker products.  I've used:

DD6
Their throw out bearing (I've seen OEM's totally destroyed and pieces on tranny drain plug)
Shift drum
Tranny shift lever
Grudge Box bearing for OEM six speed
Grudge Box gear set

I had the trap door retaining rings cave out on their early DD6, however Baker replaced with a brand new DD6 with the improved retaining rings.  That tranny held tight with my 114".  This Grudge Box pulley spacer is a concern though.