Ad;152 135 engine

[Will 1594]

Back crank seal leaking into bell housing ,is it much of a job ,doing it , obviously split it ,and may do clutch ,will put spigot bearing in any way , is it sump off ,
How does ,seal fit

 

[agrimax]

Don't need the sump off to replace the crank seal,but you might find the cork seal on the end of the sump is the culprit rather than the crank seal. So it would be the sump off for that.
Depending on the age,you may have a rope seal or a lip seal.Can't say for the lip seal type but if it's a rope seal,the backing plate needs to come off and then the seal housing is in two halves.Soak the new seal in oil for an hour or two and roll into place,leaving the ends protruding about 0.5mm. They shouldn't need trimmed.
@MF-ANDY will know more.........

 

[MrNoo]

Oil overnight and then as said roll into place with a decent bar, despite what they all say I have always had to trim very slightly, not had any issues with ones I've done.

 

[Mursal]

And double check the crank breather isn't blocked.

 

[MF-ANDY]

Don't need the sump off to replace the crank seal,but you might find the cork seal on the end of the sump is the culprit rather than the crank seal. So it would be the sump off for that.
Depending on the age,you may have a rope seal or a lip seal.Can't say for the lip seal type but if it's a rope seal,the backing plate needs to come off and then the seal housing is in two halves.Soak the new seal in oil for an hour or two and roll into place,leaving the ends protruding about 0.5mm. They shouldn't need trimmed.
@MF-ANDY will know more.........

That is spot on. If its rope seal make sure you put the top and bottom halves on in the correct places there is a drainage cut out in the bottom one. If its a lip seal there is a special tool that pushes the seal further in to sit on a different part of the crank. Either way its more than likely oil being leaked passed a dried out and hardened cork seal at the back of the sump.