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Honda CB750K5 Restoration by Royhall
royhall:
Following holidays and an extended period of illness I have got back onto the 750 only to discover a bit of a snag. I have jumped forwards a little bit here but bear with me. I was just fitting the oil tank side panel and removed the cap/dipstick to get it in and I noticed that the dipstick was dry. The oil tank was filled about 4 weeks ago and it appears that roughly half the tanks contents have found there way into the sump. I have removed the sump plate with the tank still half full and dried around the area with tissue. At the moment it's still dripping a bit from the oil on the castings, will leave it overnight then see if I can spot where it's coming from. Is it even possible to connect the hoses reversed, I don't think it is. I fully rebuilt the pump when I did the engine, am beginning to suspect a mistake somewhere. Any ideas will be welcome. Cheers.
Bryanj:
Sounds like the valve in the pump is leaking a bit, always was a thing on 750's stood for a while
royhall:
That was my first thought Bryan but it was rebuilt with all new seals. I'm Hoping when the surrounding castings have stopped dripping and dry out that I will be able to see where the leak is coming from. I'm hoping that I didn't damage anything when I changed the centre seal as it was a bit hard to get out. I think that would cause the leak to be coming out of the filter screen.
Skoti:
Mines does that when parked up during the winter months.
I just drain the sump and pour the oil back into the oil tank through a straining filter.
I believe the term for this is "wet sumping", common on British motorcycles.
BTW
Did you replace the valve plunger seal 15166 300 000 with a genuine Honda one or an aftermarket version?
Trigger:
--- Quote from: royhall on July 26, 2023, 05:03:05 PM ---Following holidays and an extended period of illness I have got back onto the 750 only to discover a bit of a snag. I have jumped forwards a little bit here but bear with me. I was just fitting the oil tank side panel and removed the cap/dipstick to get it in and I noticed that the dipstick was dry. The oil tank was filled about 4 weeks ago and it appears that roughly half the tanks contents have found there way into the sump. I have removed the sump plate with the tank still half full and dried around the area with tissue. At the moment it's still dripping a bit from the oil on the castings, will leave it overnight then see if I can spot where it's coming from. Is it even possible to connect the hoses reversed, I don't think it is. I fully rebuilt the pump when I did the engine, am beginning to suspect a mistake somewhere. Any ideas will be welcome. Cheers.
--- End quote ---
It is normal Roy. Some people call it sumping but, sumping is when all the oil goes to the sump.
Just start the bike up and it will return to the tank and once the tank is full again, ride away ;)
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