Transfer seal

[beanz2]

No, #59 on the SOR pic is the 5th gear oiler nipple. It only directs splashing oil to the 5th gear if using the H55f. No transferring from tranny to transfer possible, as there is no hole where the oiler fits.

IIRC the seal I used only had a spring on one side, but I may be wrong here.

The breather has a spring loaded cap that when removed leaves a short pipe with a flare at the end. A little short but if you put a hose and clamp it tight, it will hold it in place just fine.

Dave

 

[Radd Cruisers]

there are a couple reasons that the seal goes. a seal can go because one of the output seals has leaked and the heat from no lubricaton has "burnt" the seal causing it to wear. it can be normal seal failure with age. i have never seen the imput bearing gone on a 2 piece t/case and i highly doubt that you have either Rob.



I have not seen total failure of the bearing, but a worn bearing allowing the shaft to drop into the seal a few thousands of a inch allows oil through the seal.

Generally the t-case bearings are the most worn as they are always under load.

The other cause is also lack of oil and the seal will deeply groove the shaft also allowing oil through, speedy slee is a possible fix.

One Tcase we opened up looked as though someone had taken a tiger torch and heat it up blackening the entire inners. Low oil over a period of time?

Lets face it, like coolant, diffs etc, they are regarded by the less mechanically incline to be a lifetime fluid............ although we know otherwise.

 

[cruiser_guy]

Sorry to jump in here again,just wondering what kind of vent-hose you replace the stock vent with,is it ok to replace it with a 90 degree fitting(pipe thread with barbed hose end) and run a hose to a higher point.
What is this STC breather,#59 for and will it cause fluid transfer.
Tried to do my tranny seal on the weekend but unfortunately I was given the wrong seal,the part # on the bag was right but it contained the wrong seal,knew I was in trouble when I opened the bag,so continued next weekend.
Just to be sure the 90311-48012 main seal should contain a spring on each side of the seal,yes?? like 2 regular wheel bearing or crank seals placed face to face,# side to # side.
NorCalCruzr there are a couple of o-rings that I found that might need to be replaced also,2 on the idler shaft and 1 on the tranny output shaft sitting just between the tranny shaft bearing and the gear the main seal runs on.I think if this o-ring or the one on the front of the idler shaft is worn or damaged it might also cause a leak,very slowly but one none the less..
Thanks James.....

The seal is a normal looking seal. Nothing with two springs or any such strange contraption. I'd do the idler shaft "O" rings as well just to be safe. If you're going to redo the transfer case went you'll want to find a combo 90 degree bend with a thread for the case and a barb for the hose. There isn't enough room for several fittings (at least there wasn't on my '82 BJ60 with an H55 swap).

As far as wear in the transfer, I have had to replace the idler shaft and bearings on mine once but that was likely due to the thrust washers coming out of position during an earlier reassembly. Make SURE the little detents in the thrust washers are in the detents in the case.

 

[crushers]

i had a customer coming through Calgary from the east. he had his fluids "checked" at one of those minute lube (generic term) and was given the okay. turned out they could not get the fill plug loose on the t/case so they just assumed it was okay and away he went. the truck stopped dead in Strathmore east of the city and that is when he called me.
i told him to push in the clutch and start the engine which it fired right up, now let out the clutch and the engien died.
we got it towed here and i could smell the t/case from meters away. over the pit and apart came the t/case. the findings were the gears were black and MELTED. the teeth were melted round and there were blobs of metal in the case.
it was the worse case i had ever seen. i kept a sample gear for years on the shelf.

i have never seen the imput bearing worn and even in this case the upper imput bearing still looked fine. there is very little load on that particular bearing.

 

[Diescipel]

Not sure I get everything people are saying about the t-case breather--do you just replace the part (#6), or do you modify it? Sounds like people are describing a modification.

B

 

[Radd Cruisers]

there are a couple reasons that the seal goes. a seal can go because one of the output seals has leaked and the heat from no lubricaton has "burnt" the seal causing it to wear. it can be normal seal failure with age. i have never seen the imput bearing gone on a 2 piece t/case and i highly doubt that you have either Rob.

unless i see obvious signs of wear in the t/case internals OR extreme high milage or swaping a different set of gears in, i will not recommend that a customer throw away good money on a rebuild kit.




Even if you rebuild the case it should only take you about 2-3 hours to complete the task.

HTHs
cheers

Quite possibly heat would be a good source of seal failure, I would agree with that judgement.

If you install the seal and it goes again shortly afterword, what would be the cause then?

Usually thier is a cause to the failure, transfering the tranny fluid to fill the transfercase?

All the H55s and tcase I have rebuilt had high milage, guess this is why I found the most wear in the Tcase. Severe wear on the idler bearings in the tcase.

Guess that is why the kits come with new idler shaft also, one big chunk of steel.

 

[crushers]

i would guess poor install if the seal goes right away or a poor quaility seal...
the idler bearings and shaft have the most load place upon them so yes they can wear...
cheers

 

[beanz2]

Not sure I get everything people are saying about the t-case breather--do you just replace the part (#6), or do you modify it? Sounds like people are describing a modification.

B

Yes, B, modify it. I don't think the case is threaded at the vent.

Dave

 

[lowenbrau]

Yes, B, modify it. I don't think the case is threaded at the vent.

Dave

That is easiest and very effective.

You can also twist the whole thing out with some vicegrips and the hole that is left will be perfect for tapping 1/4" NPT. That's what I do and then screw a 90 degree NPT to barbed fitting in there.

 

[Jimmy B]

Thanks for all the info guys,would anyone know if the 74's might have had a different style seal installed to try to solve the leak problem? Is it ok to install the seal that the dealer is giving me,basicly it is a double lipped seal, if so then which way should the spring face ,tranny or transfer.The one in my case looks to me to be a upgraded design,I might give the local seal shop a call that I deal with at work and see if they can match the one in the case now,or suggest a good replacement.I even think 2 thinner single lipped seals installed face to face would work well.
My truck is has fairly low kms at 140,000 and the internals look clean,oil was sort of ugly looking though,might still have been the original fluids,slight wear(polished) marks on the gear seal surface so I delieve the seal just gave out,or its leaking from one of the o-rings.I will be replacing the bearings on either side of the seal on the tranny output shaft just to be safe...
Just wondering what would a bearing kit for the transfer be worth.
Thanks James....

 

[beanz2]

Is it ok to install the seal that the dealer is giving me,basicly it is a double lipped seal, if so then which way should the spring face ,tranny or transfer.The one in my case looks to me to be a upgraded design,I might give the local seal shop a call that I deal with at work and see if they can match the one in the case now,or suggest a good replacement.I even think 2 thinner single lipped seals installed face to face would work well.
.

If the double lipped seal's diameters fit, use it. It might be another one of Toyota's running upgrades. What is the seal part number BTW?

A lot of seals Toyota makes (such as axle shaft seals) are double lipped, but with a single spring.

Dave

 

[Jimmy B]

Sorry Dave but I may be confusing everyone here,the seal that is in my case now is of a double lipped design but has 2 springs in it,one on the tranny side and one on the transfer side.According to the seal shop and with my experience-hydraulics,the stock seal(prt#90311-48012) that Toyota is providing,a double lipped single spring design is designed only to keep fluid on the side with the spring,for example if the spring was facing the transfer side and there was a build up of pressure in the tranny from say a plugged vent, the fluid would pass into the transfer case even if the seal is in good shape,the very small secondary lip on these double lipped seals is basicly a scrapper,for example to keep dirt from damaging the main sealing surface of the seal(where the spring is) on a wheel bearing seal.
With the single spring seal which way is the spring installed?, for me it would be toward the tranny since it is higher and the fluid would want to flow towards the transfer,just wondering how would the most common problem of the transfer filling the tranny can happen since the gear behind the seal on the transfer side would act as a slinger and throw the oil away from the seal.
The seal shop is unable to match the original seal I have.I have found a single lipped seal to duplicate the seal I have now by installing 2 face to face but I will have to narrow the outer flange to fit in the provided space,the stock seal is 10mm wide and the single lipped seals are 7mm wide each =14mm,I will have to narrow the outer flange of the new seals by 2 mm each to fit the provided space.Seem like overkill but peace of mind for me.
James.....

 

[beanz2]

You maybe right, the seal may have double springs looking at the FSM. I installed it with the lip toward the transfer. No leaks so far, no oil transfer. I'd double the seal if I had thought of it too

Dave

 

[David*BJ70]

When the fluid transfer between the Tranny and the T-Case occur, is that happen only after driving ? and then the fluid go slowly back in the T-Case.

So if the Cruiser did't move since two day, I can't detect the problem ?

The question is : Did I have to drive the Cruiser to see the problem ? or I can realize the problem after 2 days without driving it ?

Thank

 

[tlcruiserman]

When the fluid transfer between the Tranny and the T-Case occur, is that happen only after driving ? and then the fluid go slowly back in the T-Case.

So if the Cruiser did't move since two day, I can't detect the problem ?

The question is : Did I have to drive the Cruiser to see the problem ? or I can realize the problem after 2 days without driving it ?

Thank

I am pretty sure you need to drive it to tell, it has to do with the motion of spinning gears and shafts.

Michael

 

[2rivers]

A little late on this thread but timely thanks NorCal

not like I dont have any other vehicle-realted projects going, but I noticed on my last grease job that my transfer case on my HJ61 was dripping from the front output. I grabbed it and wiggled it saying to myself WTF and it went clunk clunk - way too much play for just the seal to have gone I think?? NorCal did you have that? Anyothers? Probably a bearing I am guessing? I was mystified by this becasue I thought this rig was hardly (if ever) in 4 wheel drive before I got it and wonder how it happened. But hey what do I know other than I think my luck can only improve.