knuckle rebuild

[Big C]

I resently rebuilt both of my knuckles and they have now started to leek (again). I kno thats not normal but i dont kno what the deal is? I guess i need to replaced the seals again? So i went back and looked at some pictures of the kits and they have more than one set of seals, mine only had one...? Also i put some longs in it and they stick out ferther than the old ones is that normal? any help would be cool

 

[Pighead]

Leaking from where?

 

[bruff]

Did you use Marlin inner seals or OEM?

 

[Pighead]

How 'bout a picture of the knuckleleak? We love the pics...

 

[nuclearlemon]

So i went back and looked at some pictures of the kits and they have more than one set of seals, mine only had one...?l

there should be a pair of small seals for the inner axle, and a pair of large seals for the hub. along with all the gaskets.

 

[Tools R Us]

Year/model of rig?

 

[IdahoDoug]

Right - year/model of the rig, year and model of the Longfields - there are different lengths for different years. Also, do you know what an inner axle seal is and did you replace it?

DougM

 

[Big C]

well the rig is a 91 fj80 and the longs are fj80 longs. i used the oem seals cuz i didnt kno about the marlin ones. i cant post pics cuz i broke my camera but it is leaking from where the birf sticks out of the hub.

 

[nuclearlemon]

did you put new gaskets in when you put the hub together? did you get the old gasket material all cleaned off?

 

[Tools R Us]

well the rig is a 91 fj80 and the longs are fj80 longs. i used the oem seals cuz i didnt kno about the marlin ones. i cant post pics cuz i broke my camera but it is leaking from where the birf sticks out of the hub.

The Longs are made for ABS/full floater rigs, the earlier rigs have shorter birfs and drive plates. You can have the birfs cut shorter or just get a pair of the later drive plates.

Leaking out of the drive plate, how bad? Likely just because of too much movement. If the axle seal were leaking it's more likely to leak at the wiper first. On the Marlin seal, I'm not impressed, have them and running stock type.

 

[Pighead]

it is leaking from where the birf sticks out of the hub.

Isn't there a cap that goes on the outside of the driveplate, holds the grease inside and covers that end of the birf? Do yours fit on?

 

[nuclearlemon]

Isn't there a cap that goes on the outside of the driveplate, holds the grease inside and covers that end of the birf? Do yours fit on?

yup, # 43423

 

[Pighead]

And sometimes, a symptom of a wrong axle in the wrong driveplate might be that cap getting knocked off and the end of the birf sticking out...

 

[Tools R Us]

And sometimes, a symptom of a wrong axle in the wrong driveplate might be that cap getting knocked off and the end of the birf sticking out...

Correct, with the longer type birf and short drive plate, the cap doesn't stay on.

 

[Big C]

yeah i replaced all the gaskets and took all the old gaskets off. I dont have caps because the birf is to long. what is the drive plate? whats the part # from picture 3 up? So what your saying is that i needed to put fj60/62 long in it?

 

[overhanger]

I recently found that the Marlin seals don't float the way OEM do. Meaning, if you have any axial axle play, the Marlins don't seem to move with that play and the OEM will move, maintaing the seal with the axle. OEMs lasted two years without failure while the Marlins failed miserably within one year in our 80. The 62's Marlin seals have been great, though.

 

[Big C]

i guess im kinda in a pickel now. i dont kno what i need to get...?

 

[Pighead]

I dont have caps because the birf is to long.

Did we just answer our own question?

 

[Tenzig Norgay]

I think you need part number 43421, the drive plate. Make sure you get the correct drive plate, not for your 91, but for the newer style birfs in the 93 and up. You will need one for each side, then the end cap will fit on and no more leaky. The newer style birfs are longer, and so are your longs, and the correct drive plate is deeper, allowing for more axle spline to drive plate spline interface, making them stronger supposably.

 

[Tools R Us]

I think you need part number 43421, the drive plate. Make sure you get the correct drive plate, not for your 91, but for the newer style birfs in the 93 and up. You will need one for each side, then the end cap will fit on and no more leaky. The newer style birfs are longer, and so are your longs, and the correct drive plate is deeper, allowing for more axle spline to drive plate spline interface, making them stronger supposably.

The drive plates that you need are for an ABS equipped rig. Some 93 & 94 rigs have the earlier type, to be safe just ask for 95-97 type. They have longer splines, more engagement, so are stronger.