SOHC.co.uk Forums > CB350/400
CB400/4 ENGINE STRIP, ASSESSMENT AND REBUILD BY JULIE - NOW COMPLETE
Nurse Julie:
Back to the subject of water damage in the bores, or lack of it in the case of my 400/4. I found a barrel in the workshop, from a CB750, that clearly shows a water mark, half moon shape, where the bike had been left standing for a long period of time on the side stand. The water had been sitting on the top of the piston. On this particular barrel, the watermark was not evident until the bore had been honed.
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Nurse Julie:
Took the oil pump apart this morning. I was concerned that with the amount of swarf that may have been going around that some damage may have occurred but no, it’s perfect inside. No scoring or abrasion damage evident . I measured the clearance, rotor to housing service limit is 0.35mm max, mine measured 0.10mm. Also measured the inner to outer rotor clearance, service limit is 0.30 mm max and mine measured 0.08 mm, 0.09 mm, 0.09 mm and 0.10mm on the four points. I’m very pleased with all that.
Even though the pump had new ‘O’ rings fitted less than 500 miles ago due to a leak caused by old, brittle rubber, I reassembled it using new ‘O’ rings as I have oil pump ‘O’ ring kits here for the CB400/4 so would have been silly not to fit new again. Pump now all ready to bolt back on, when I get to that stage.
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Orcade-Ian:
The filtration system has obviously been doing its job, the pump certainly seems not to have ingested anything nasty and no doubt all the oilways will have their bungs removed and be checked.
Has Trig got a new camera? The detail is excellent!
Not long now! Great work,
Ian
Nurse Julie:
Thanks Ian.
No, Trig is still using his camera with the out of focus, frosted lens. I'm taking these pictures with my £25 mobile phone. They are really clear.
rockvegas400:
Julie do you know what size the o rings are in your oil pump kit? I'm interested to see if I can buy them from a local supplier.
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