Good evening. Not a problem, more a puzzle.
With having the diff out to fit to replacement chassis, I thought I would fix the oil leak from the nose of the diff by changing the oil seal.
All went well. Made tool with long bar to hold the front flange; undid the nut with even longer pipe on the end of the nut tommy bar; flange withdrew easily with puller, then spend the rest of the day removing the old oil seal. What a job that was !!! Eventually came out. Awaiting replacement. Have chosen to use alternate rubber seal not leather.
Onto the puzzle. Removed the front mounting plate to get to the oil seal and noticed the securing bolts, Part 132856. Never seen these before. Puzzled as to the reason for the special shape of the shank. See attached and Rimmer site photo of 132856. A very special bolt indeed priced at £6.25 each. Note it is a 3/8" thread but uses a 7/16" shakeproof washer because of the shank shape. All bolts are OK so not having to purchase the bolts just the special internal shakeproof washers.
Why this profile I am asking ???? Mounting plate has a bore machined to suit the spigot on the casting of the diff so is located accurately I would think. Never seen this profile before. Any advice to set my mind at rest. Just curious.
Thanks, David B