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Honda CB750K5 Restoration by Royhall
royhall:
Thanks Trig. Whilst the sump plate is off I may as well double check that nothing is stuck in the relief valve.
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Trigger:
--- Quote from: royhall on July 26, 2023, 06:39:11 PM ---Thanks Trig. Whilst the sump plate is off I may as well double check that nothing is stuck in the relief valve.
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If you have the sump off, take the cap off, remove the spring and turn the plunger with your little finger to make sure it is nice and free, and not catching.
royhall:
--- Quote from: Skoti on July 26, 2023, 06:20:37 PM ---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?
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Yes I replaced all the seals in the pump. The kit came from Trig/Julie so is probably a well tested reliable kit.
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Martin6:
--- Quote from: Trigger on July 26, 2023, 06:37:20 PM ---
--- 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.
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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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That's the beauty of a full unit construction engine and gearbox. If you do that on old British bikes, you risk blowing crankcase to primary seals.
Out of interest, do these motors solely rely on oil pump tolerances to keep oil in the tank? No in line anti-sumping valves, etc.?
Martin6:
Just read the thread end to end. You've done a wonderful job Roy. We'll done.
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