I just got delivery of my new (to me) '53 Sq 4 last week. The transport driver mentioned that the bike had leaked oil all over the floor of his rig, and then while the bike was sitting in my garage waiting for a new petcock, there was a pretty decent puddle left under the bike.
according to the seller, it has been at least 2 years since he last started the bike, but he claims to have completely rebuilt the engine prior to that (and provided stacks of invoices from Draganfly as evidence)
today, after checking points, timing, valve clearances, removing the carb and ultrasonically cleaning it, removing the tank and flushing, I went to change the oil.. I expected there would have been some wet sumping, and did find the oil tank to be at only about 1/4 full, but after a cursory inspection underneath, I could find any sort of sump drain plug.... Is there one? Or do you just have to remove that entire 4-bolt sump cover?
I decided instead to just cautiously fill the tank to about 1/2 or so for an exploratory startup.
Before I started it, but after topping up the oil tank, I noticed a fresh and growing puddle of oil underneath, but ignored it for the moment.
To my great surprise, after some 7-8 kicks, the old gal roared to life, seemed to be running on all 4, nice and smooth, good throttle response, and I quickly checked inside the oil tank to confirm I was getting return oil.
I ran the bike for only a minute or so, then shut it down, but then noticed a huge puddle of oil, and still coming out in a fairly small but steady stream.. it appeared to be coming from the bottom of the primary case, but then I had the bike on the side stand, so it could have drained from the other side.
Checking the oil tank, the level was back down from 1/2 to about 1/4 full, so I'm thinking the oil is coming from the engine, not the gearbox.
I'm still a rank novice as far as understanding the oil piping for this engine, and there doesn't seem to be any diagram showing that. I am hoping that perhaps I just have a leaking hose or line going from or coming to the tank, but nothing was readily apparent. It was the end of the day, hot and sweaty in my 100 degree F garage, so I gave up without any further investigation, hoping someone on the forum might have some suggestions as to where all my oil is going? (and, how to drain the sump!)
Phil Auldridge Austin, Texas - USA
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53 SQ 4 MK II, '72 Norton Commando, '78 BMW R100/7, '79 Honda CBX, 2014 Indian Chief Vintage