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This will probably be the front C-V shaft or hub bearing. When in 2 wheel drive the C-V shaft will not have a load on it. But as soon as you change to 4 wheel drive the part has stress on it. It can also behave this way when the Hub bearing is asked to bear Torque from the turning C-V shaft. Instead of having slack from the weight of the truck pressing the Hub bearings straight up, the bearings are rotating under Torque and any play is magnified.
The rubbing can be the rotor, running on bad bearings and hitting the brake pads. As the rotor is bolted onto the Hub bearing, the rotor will tilt in harmony to the bad bearings in the Hub. This creates a misalignment as one side of the rotor is tilted creating a high side.
Drop the drive shaft, tranny cross member, transmission and bell housing. Remove the clutch pressure plate and disc and get new set. Use a pilot/clutch alignment tool in the crank shaft pilot bearing/bushing to center the disc and put the new pressure plate on and torque it down. Then put the bell housing, transmission, cross member, and drive shaft back in, and your done.
mercedes say that 1ltr per 1k is acceptable.you dont say what mileage the car has done but over 70k i would recomend putting in 20/50 instead of 5/40.all forced air engines are designed to use oil to keep em sweet.turbo bearings/compressor bearings etc...
CAM SHAFT BEARING CAPS 15 FT LBS. DRIVE SPROCKET BOLT 58 FT LBS. CAMSHAFT END PLAY IS 0.006 in. WARNING THIS IS THE 2.8L ENGINE WHEN TORQUEING CAM SHAFT BEARING CAPS YOU HAVE TO TIGHTEN THE BOLTS 2 TURNS AT A TIME IN A DIAGONAL PATTERN TO DRAW THE CAMSHAFT DOWN AGAINST THE VALVE SPRING.
hi, now this is a big job and the nut you need to undo you will need a air gun to undo is as it is torqued up that tight that you wont undo it using any hand tools but here is how you do it. 1. put car on axle stands so wheels are off the floor and remove the wheels. 2. On the side that the bearing needs replacing you need to undo the bottom ball joint witch is under neath the disk break should be just one nut and bolt. 3. is best to undo the track rod end from the steering rack this is the tie rod and should be located in the wheel hub towards the drivers door and is held in place with one nut from under neath. 4. after you undo both of these you will then need a ball joint splitter to sepperate these parts from the hub as they will be to tight to remove from their locating possition. 5. now to get to the bearing itself this is where you need an airgun or similar tool they use in a garage. now right at the centre of the wheel hub you will see a really bug nut attatched to the end of the drive shaft and you can see the end off the drive shaft coming through the hub. I think the nut is nearly a 30m or 32m socket to undo. 6. Once this is undone gently tap the end of the drive shaft through the hub whilst gently pulling the hub outwards dont pull the hub outwards if the drive shaft isnt coming free from the hub as you can pull the drive shaft out of the gearbox and then you will have a right mess with geasrbox oil everywhere as the drive shaft is only push fit into gear box.
If the drive shaft is coming free from the hub then keep pulling the hub towards you untill the drive shaft is free (secure driveshaft with string so as not to put stress on the drive shaft bearing). Now you should be able to remove the old bearing and insert the new make sure you clean the old bearing out properly and use new grease to lube the new bearing.
When doing the drive shaft back up you need to use air gun again to tighten the nut up enough to be safe to drive as their is alot of pressure on these parts. You wont undo the nut without a air compressor and air tools buying these would be more expensive than paying a garage to do the repairs themselves. Please choose carefully as once you have started if you have any problems you cant take the car to a garage as it will be in bits. Let me know if you need further assistance. If you are going to do this yourself then please buy a workshop manual as this will give you the correct torque settings as the bearing has to be torqued up to a required setting else the bearing will just fail again.