SOHC.co.uk Forums > CB350/400
Won't return to idle/slight oil seep...
Mikep328:
Thanks Ian. I'll take a look under that cover this weekend and see what's happening. Hope no major disassembly work will be required to sort out whatever it is. If such work is required, I'd probably just let it seep for a while and enjoy riding the bike!
Julie, appreciate the talc suggestion; I'll definitely do that!
McCabe-Thiele (Ted):
--- Quote from: Mikep328 on August 09, 2023, 03:46:16 PM ---The slight oil seep I have does not appear to be from the pan gasket. It is dripping from the cover on the left side of the engine adjacent to the pan and then down the side of the pan. So based on an earlier post, the suspect is the gear change seal?
I suppose I could use the oil seep to determine if there is oil in the bike as per old BrittBikes - "If it's not leaking it's out of oil!" But I'd prefer the typical Honda method - no oil leaks at all!
--- End quote ---
Sounds crazy but I found new oil especially 10w/40 synthetics would leak oil via the rear main seal on cars - after a few days or a 100 miles they would disappear - I put it down to the thin searching oil & plasticizers that they add to modern oils then fixing the cause.
Mikep328:
Good advice re checking instead of ASSuming the oil pan gasket was the leak. I removed the left side cover and found that the leak is at the lower left (as you face it) of the oil pump. It seeps immediately upon starting the engine. no leaks from the oil pressure sender. I'll check the service manual for the procedure to remove/replace the oil pump seal but if anyone has some specific advice re this, don't hesitate to post!
This added several minutes later: It appears from the service manual that the pump has essentially three Orings - a large one and two smaller ones that appear to fit around the lower bolts AND that the pump can be removed without draining the oil. Is my reading correct?
McCabe-Thiele (Ted):
There are 5 O rings in total in the oil pump.
Nurse Julie:
--- Quote from: McCabe-Thiele (Ted) on August 11, 2023, 02:47:23 PM ---There are 5 O rings in total on the oil pump.
--- End quote ---
There are 8 in total on the 400 Ted, including the gearbox oil pump O rings.
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