I have just dont my first transmission service and I just thought I would note a few things.
First the alloy sump bolts are lightweight crap, I know they are designed to prevent stripping of threads in the transmission but I had one of em snap at 4nm ( all replacement bolts were new) I dont know if I got a dodgy bolt but I have always hated these light bolts anyway, especially the last 180 degree turn designed to nip and stretch at the same time so I ended up drilling and tapping the bolt out and replaced all the bolts with stainless steel ones using a jointing compound to prevent dissimilar corrosion and torqued to 6nm, I did a breakaway and run down torque test on the bolt holes in the transmission and 6nm is no way excessive for these and compared to a light alloy bolt finished off with a 180 degree final turn and 6nm on the stainless they both nip up the same amount, I am thinking the light alloy was done to prevent heavy handed mechanics from stripping threads but as an aircraft engineer I am used to working with delicate alloy components.
Second the patent filter from viaco is a poor fit and I ended up replacing it with a genuine mercedes one as the viaco one drooped down when installed
Third be aware of the lip at the front of the sump mating surface as it is easy to distort the seal on it which will cause leaks.
Thats it but I will get a new sump and fit a drain bung into it so I can do a drain and fill every year without having to drop the sump.
hoping to be able to help the board out with write ups whenever I work on the car as I always do my own work, next up is glow plugs but I dont know if the board needs these sort of write ups?
First the alloy sump bolts are lightweight crap, I know they are designed to prevent stripping of threads in the transmission but I had one of em snap at 4nm ( all replacement bolts were new) I dont know if I got a dodgy bolt but I have always hated these light bolts anyway, especially the last 180 degree turn designed to nip and stretch at the same time so I ended up drilling and tapping the bolt out and replaced all the bolts with stainless steel ones using a jointing compound to prevent dissimilar corrosion and torqued to 6nm, I did a breakaway and run down torque test on the bolt holes in the transmission and 6nm is no way excessive for these and compared to a light alloy bolt finished off with a 180 degree final turn and 6nm on the stainless they both nip up the same amount, I am thinking the light alloy was done to prevent heavy handed mechanics from stripping threads but as an aircraft engineer I am used to working with delicate alloy components.
Second the patent filter from viaco is a poor fit and I ended up replacing it with a genuine mercedes one as the viaco one drooped down when installed
Third be aware of the lip at the front of the sump mating surface as it is easy to distort the seal on it which will cause leaks.
Thats it but I will get a new sump and fit a drain bung into it so I can do a drain and fill every year without having to drop the sump.
hoping to be able to help the board out with write ups whenever I work on the car as I always do my own work, next up is glow plugs but I dont know if the board needs these sort of write ups?