650ss oil filter

When changing oil on a 650ss, how many filters are there to change? (Or clean)
I know there is one in the lower crankcase, and i think there is one in the oil tank, is there also one at the rear of timing case? On the pressure relief valve?

No, just the two you mentioned. Calling them filters is being a bit generous though. Strainers would be a more accurate description as they only catch really bit bits of debris.

I wouldn't replace them just clean them, although the one in the tank I rarely cleaned when I had a 650SS.

Ian

Thanks for that Ian

TBolt said:

When changing oil on a 650ss, how many filters are there to change? (Or clean)
I know there is one in the lower crankcase, and i think there is one in the oil tank, is there also one at the rear of timing case? On the pressure relief valve?

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Re; is there also one at the rear of timing case? On the pressure relief valve?

There was no strainer/filter here, the first thing you knew about it being blocked was when the oil pipe to the rocker feed blew off:!:

Edited

TBolt said:

is there also one at the rear of timing case? On the pressure relief valve?

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This one?


I think this particular oil pressure relief valve and filter arrangement was discontinued during the early to mid '60s.

Yes that's the one I meant, I have the same picture in my manual!
Mine is a 62 so I wonder if it has one, and how hard it would be to take out and clean? I'll give it a try tomorrow.

TBolt said:

Bernhard, I'm sorry but I cannot comprehend this statement!

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oophs!
There was no strainer/filter here,(at least, not on my bike) the first thing you knew about it being blocked was when the oil pipe to the rocker feed blew off:!:

Now it appears that there should have been one :?: :shock:

Ok, pulled oil pressure relief valve out, and it does have a strainer on it, which was almost completely blocked with old grime and built up a 1/4 inch thick in the centre!
Much longer and I think it would have gone as Bernhard said and maybe blown a pipe from no pressure relief.
I would think if you have an older 650 like mine (62) that you check yours too, because its probably always been overlooked?

Usually the piston in a relief valve that grimy is stuck too....

The piston was hard to get out and didn't slide very smoothly. I cleaned the bore and piston and oiled it and feels better now

TBolt said:

When changing oil on a 650ss, how many filters are there to change? (Or clean)
I know there is one in the lower crankcase, and i think there is one in the oil tank, is there also one at the rear of timing case? On the pressure relief valve?

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Plus the centrifugal oil cleaner in the crankshaft which was fitted to most of the British twin of that era. This should be cleaned out about every 100,000 miles.
You don’t forget doing this job in a hurry, chipping away at the hardened crud with a chisel, then using a wire brush and cleaning solvent to get it completely clean.

“A centrifugal oil cleaner is a rotary sedimentation device using centrifugal force rather than gravity to separate contaminants from the oil, in the same manner as any other centrifuge. Pressurized oil enters the centre of the housing and passes into a drum rotor free to spin on a bearing and seal. The rotor has two jet nozzles arranged to direct a stream of oil at the inner housing to rotate the drum. The oil then slides to the bottom of the housing wall, leaving particulate oil contaminants stuck to the housing walls. The housing must periodically be cleaned, or the particles will accumulate to such a thickness as to stop the drum rotating. In this condition, unfiltered oil will be recirculated.”

Bernhard said:

TBolt said:

“A centrifugal oil cleaner is a rotary sedimentation device using centrifugal force rather than gravity to separate contaminants from the oil, in the same manner as any other centrifuge. Pressurized oil enters the centre of the housing and passes into a drum rotor free to spin on a bearing and seal. The rotor has two jet nozzles arranged to direct a stream of oil at the inner housing to rotate the drum. The oil then slides to the bottom of the housing wall, leaving particulate oil contaminants stuck to the housing walls. The housing must periodically be cleaned, or the particles will accumulate to such a thickness as to stop the drum rotating. In this condition, unfiltered oil will be recirculated.”

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British bike sludge traps are different from that. They don't have a free-spinning drum or jet nozzles.

Bernhard, did you mean that it should be cleaned every one million miles, or was that a typo?

Whoops :!:
I’ve corrected it to 100,000 miles :shock:

Triton Thrasher said:

Bernhard said:

TBolt said:

“A centrifugal oil cleaner is a rotary sedimentation device using centrifugal force rather than gravity to separate contaminants from the oil, in the same manner as any other centrifuge. Pressurized oil enters the centre of the housing and passes into a drum rotor free to spin on a bearing and seal. The rotor has two jet nozzles arranged to direct a stream of oil at the inner housing to rotate the drum. The oil then slides to the bottom of the housing wall, leaving particulate oil contaminants stuck to the housing walls. The housing must periodically be cleaned, or the particles will accumulate to such a thickness as to stop the drum rotating. In this condition, unfiltered oil will be recirculated.”

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Why did you post that? British bike sludge traps are different from that. They don't have a free-spinning drum or jet nozzles.

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+ quite correct, another blunder :!: