Then I removed the PTO as the output shaft oil seal is leaking and I need to strip the unit to check the size of the seal.
luckily I did as the box had no oil in it and what was in there looked like Cadbury’s cream egg.... oh dear...
anyway after removing the PTO, shaft and front knuckle I cleaned out what I could from the gearbox removing the inspection plate and pulled the studs on the PTO side. I have several spare gearboxes do I removed another inspection plate from on, made two gaskets and bolted everything back up.
I have filled the gearbox with engine oil and engine cleaner/degreaser and went for a little drive....
Once back I drained the box, pulled both side plates and cleaned out the box again, now it’s lovely and clean inside. Tomorrow I will refill the box again with plain oil and repeat the process to ensure all the cleaning agent is out before fitting new gaskets and gearbox oil.
The cause of the cream seems to be water getting in via the input seal, when I collected the truck the bell housing was full of rain water, a blocked drain hole in the lower inspection cover was to blame, this has now been removed and cleaned out with extra holes drilled as well