SOHC.co.uk Forums > CB350/400
Changing oil...grrr!
Mikep328:
Very annoying! Went to change the oil yesterday for the first time on my watch. Drain plug was very tight - couldn't budge it with a 17mm 3/8" drive socket/ratchet but I finally got it off with a 17mm 1/2" drive. The filter bolt was partially seized to the filter "case" and had been buggered/rounded so no wrench would fit. It was also extremely tight and very difficult to remove. After removing it, I 'adjusted' the hex head with some file work to take an 11mm socket/wrench.
Then, in proceeding with the change, found that the washer that goes between the spring and the filter was missing. I thought maybe it had stuck to the filter or maybe fell on the floor when I disassembled everything but that was not the case, in fact, I could see the imprint of the spring itself in the rubber on the filter. So that was the end of the oil change procedure until I get a washer. I went to the local hardware store but nothing of that size available so I ordered that and a couple of other small parts from DS, including a new filter bolt, which I decided was better than my 'adjusted' filter bolt. I wanted to order a genuine part with the original 12mm hex but they were out of stock so I ordered the (much cheaper) aftermarket with the 17mm hex. Can't really think why a 17mm hex is needed on a fitting that only needs to be tight enough to compress an O ring... ;)
TBH, I wonder about the relief valve on the aftermarket bolt vs the original but since it's just a spring and a plunger, I assume it's perfectly OK. Any conflicting views re that? If so, I'll just put my (now) 11mm bolt back in! :)
The good news is that the old oil looked new and the old filter did not have any scary-looking deposits. I was pleased to see that since the engine had been rebuilt by a shop (previous owner) last year. OTOH, the absence of that filter washer and the buggered hex head on the bolt is somewhat disquieting. I would have thought that a shop doing the engine work would have ensured the washer was present and that a new filter bolt was installed...:(
Johnwebley:
I always grease the O ring so it should stay easy to undo,
Don't do it up to tight
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Johnny4428:
Wonder how many of these washers have been dumped sticking to the filter, quite a common occurrence. Probably overtightened filter bolt and combination of all the heat cycles causes seizing. Sometimes these simple jobs can be very trying!👍
florence:
I agree with John, don't do it too tight, you can always give it an extra nip later if it leaks. I have a spare filter bolt in my toolbox which I kept from years ago so wouldn't have to wait for a replacement if ever it gets stuck. Haven't needed it yet.
TrickyMicky:
If it's true that confession is good for the soul, then yes, umpteen years ago on a CB750 I soon realised why Mr. Honda had equipped the filter bolt with only a 12mm head!! When I moaned at the supplying dealer about the stupidity of it, he silenced me by saying the the cost of a new bolt was far less than mangled engine cases. Lesson learned. And yes, I'm sure that there must be thousands of waste oil drums that contain that aggravating bloody washer, always carry a few spares nowadays. The common sense example given to me was fitting a spin-on filter to a car engine, and just giving it a final nip by hand to tighten, but invariably it needed a chai/strap wrench to release it on the next oil change. How we love this pastime eh?
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