SOHC.co.uk Forums > CB350/400

Oil leak

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Nurse Julie:
I thought of that Ken but it may have been done by a previous owner. If the engine had been apart before and the wrong length bolt fitted, then Adrian has put the correct length bolt in which is now leaving a space under the bottom of the bolt for the oil to get out. The wrong long length bolt may have caused the damage but also hidden the damage by putting pressure on the crack.

adriangsmith:
Bolt measured the correct length.
Oil leak stopped with copious amounts of threebond liquid gasket on the threads and down the bolt shaft.

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Bryanj:
That would suggest to me that there is either damage or crap on the crankcase joit

billywingnut:
I had this problem after an engine strip down. I used  a piece of poly tubing slid over the bolt. It stopped the leak but then the leak moved elsewhere from the joints. To cut a long story short I stripped the engine down again. I used less jointing compound and was extra careful about the locating peg on the gearshaft. I think because the joint had too much jointing compound the oil got round the back of the bolt. It's fine now I hope that makes sense.

royhall:
That bolt holds the casing halves together so any extra long bolt would cause a break in the lower casing. The case halves are not correctly sealed (on the crankcase split line) around the bolt hole causing the oil to escape the only way it can upwards around the bolt.

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