I can't see why not, although the level plug is rather small so there is likely to be a delay between the fluid reaching that level and it starting to dribble out. I would use EP90 and see little if any advantage to using semi-fluid grease

it is very possible that someone has changed the shaft, especially if it has been used in a 1956-58 machine and the clutch has not been rubbing on the primary case. Best to measure the mainshaft as Paul suggests, the shafts are interchangeable.

A quick check in the parts book would tell you that there should be a bush. It is certainly repairable by welding and machining, a used case would be cheaper and easier.
https://draganfly.co.uk/shop/63479/kick ... /#3610-52U

Nice picture but what is the frame number?

With regular oil changes and modern filters your sludge traps should not sludge up, they will of course but will take a long time. I must admit to never having kept a SQ4 on the road for long enough! There are people out there who have...

On the one hand when using modern oils and filters the oil change interval can be extended and save the planet and you pocket. On the other hand it is a good ides to change the oil at regular intervals, irrespective of the mileage. Annual is usually quoted but if in regular use every month or so I w...

We have had heads welded up at Draganfly, Which I think was done after machining a large countersink so that the weld could reach lower down into the hole, not just round the top. We do this when repairing pulled studs on SQ4 heads but have only had to resort to this a couple of times with VH heads,...

From the works drawings, so not the latest spec
3-52 DTD 424
36-50 'Y' alloy
35-54 DTD 324
12002-54 DTD 324
35-55 DTD 324
51-56 DTD 424 die casting
35-56 DTD 424
46-56 DTD 424
51-56 DTD 424 die casting
47-49 MKI 'Y' alloy
47-53 MKII DTD 424 (heat treated)
K2-53 KH 'Y' alloy

To be honest I don't use a set torque just basically as tight as I can. The limit is reached when the crank flies out of the vice that is holding the crank while you lean on a 2 metre scaffold pole.

That might be a bit much, the official figure is FT, 60-80 ft lb is sufficient, as long as the taper is good, too tight and you may shatter the wheel