if your diff have 6 bolts to side ball bearings you have 188diff, if 4 then 168 diff if 8 bolts then you have 210 diff. in picture I not see all bolts but i looks 210 diff you have
the diff ratio you can count by rotating the shaft ant count how many turns it does
for sale e36 1.8is pistonsand rods and +new goetze rings.
also m50b25 pistons and rods All can sell seperate
give offer for price
trømso
can write sms in Norwegian language
99213231
this big thing you men't is called trigger wheel it is screwed to crankshaft with big bolt, the small crews it is used for serpentine belt pulley which is screwed to a trigger wheel, and when you remove trigger wheel you must looking that you not loose splint, by turning crank that splint is on top I don that 2 weeks ago with my m50b30 project
and you can see in picture that is no chance by opening only small screws
this probably detonation, can be for using not right spark plugs (to hot), low octane fuel, bad injectors or filter (goes lean mixtures), also if it comes to much carbon on pistons then it comes higher compression which is perfect for detonation
I had same problem, also changed to a new camshaft sensor from ebay and nothing changed, but when i buyed new orginal from bmw than oll problems was gone