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Offline eigenvector

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How does an oil filter work?
« on: December 23, 2016, 01:24:37 PM »
Silly question, but I'm troubleshooting a problem on one of my bikes that really bothers me.

I unscrewed the oil filter and discovered that it hasn't ever had oil in it - the filter was bone dry.

So I would like to backtrack the route the oil takes to get to it.

I have to add, because I'm sure the question will come up - yes, the engine is getting oil.
« Last Edit: December 23, 2016, 02:28:37 PM by eigenvector »
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1979 CB750K Limited Edition
1977 CB550K
1984 CB700SC Nighthawk
1983 VF750S Sabre

Offline MikeSimon

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Re: How does an oil filter work?
« Reply #1 on: December 23, 2016, 03:34:54 PM »
The path the oil takes from the pump varies on different bikes. Usually, the oil filter is right behind the crank bearings.
Some oil filters have a safety valve which bypasses the filter element if it is clogged. It could be that you have filter with a malfunctioning safety and the oil never went trhough the filter element.
Which bike is it?
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Offline eigenvector

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Re: How does an oil filter work?
« Reply #2 on: December 23, 2016, 07:18:00 PM »
I'll check the bypass then - thanks I didn't even know the oil filter had something like that.
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2018 HD Softail Heritage
1979 CB750K Limited Edition
1977 CB550K
1984 CB700SC Nighthawk
1983 VF750S Sabre

Offline madmtnmotors

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Re: How does an oil filter work?
« Reply #3 on: December 24, 2016, 04:30:24 AM »
Which bike?
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Offline 70CB750

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Re: How does an oil filter work?
« Reply #4 on: December 24, 2016, 04:48:32 AM »
CB750

Safety valve is in the bolt, right? 
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Offline CBJoe

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Re: How does an oil filter work?
« Reply #5 on: December 24, 2016, 07:36:30 AM »
If it's got an oil cooler...don't some of the sandwich plates also have a bypass of their own in the event of a restriction?
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Offline eigenvector

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Re: How does an oil filter work?
« Reply #6 on: December 24, 2016, 08:02:34 AM »
I know you've asked twice.

This is a Nighthawk.  It does have an oil cooler - in frame routing.

Definitely need to completely flush the engine and frame.  Dismount the oil cooler and flush it out as well.

I think it ate a pine needle (or two).
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1979 CB750K Limited Edition
1977 CB550K
1984 CB700SC Nighthawk
1983 VF750S Sabre

Offline 540nova

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Re: How does an oil filter work?
« Reply #7 on: December 24, 2016, 08:07:55 AM »
Some parts ARE edible!


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