Author Topic: Missing oil filter housing parts? (Read 4414 times)

gmonkey · « **on:** December 22, 2009, 06:31:14 AM »

Just noticed that parts microfiche for the CB550 oil filter housing parts and noticed it shows what looks like a spring and washer between the housing and filter itself (8 and 9). My bike didn't come with those. Is it even filtering the oil or is it all just going around the element? And are 11 and 12 supposed to be inside the oil filter bolt? The diagram doesn't really make that clear.

(sorry the image is so big, that's the best i could find on short notice)

Bob Wessner · « **Reply #1 on:** December 22, 2009, 06:37:08 AM »

Yes, you need the thin washer and bolt to keep the filter pressed against the housing and yes, 11 & 12 are housed inside the bolt.

ekpent · « **Reply #2 on:** December 22, 2009, 06:49:31 AM »

Bought a new spring for around 5 bucks from my local dealer---no shipping

Toxic · « **Reply #3 on:** December 22, 2009, 06:56:27 AM »

if you still have that spring handy would you mind measuring it for me.

My spring from the 77 motor is twice as long as the one from the 76. Not sure it makes a difference.

The thin washer can be had at Lowes. Just bring the spring and a new filter.
The thin washer should fit on top of the rubber gasket on your filter. This provides a seat for the spring to push up against.

ekpent · « **Reply #4 on:** December 22, 2009, 08:06:43 AM »

The spring I bought was for a 73 750K and sorry its installed.Parts numbers will tell whats compatable.

bryanj · « **Reply #5 on:** December 22, 2009, 08:10:00 AM »

All the filter springs and washers are the same part and both available from Honda

lrutt · « **Reply #6 on:** December 22, 2009, 08:15:54 AM »

spring is specific as it provides a certain 'pop off' pressure that will allow the filter to push out if a pressure is met. I would not improvise on this.

Yoshi823 · « **Reply #7 on:** December 22, 2009, 09:41:42 AM »

That washer (#8 on the diagram) would quite often inadvertantly get thrown away with the old oil filter. Then when people put in a new filter, the spring would push against the seal, sometimes forcing it inside the filter, with the consequences that follow.

gmonkey · « **Reply #8 on:** December 22, 2009, 09:53:31 AM »

What consequences would those be? I'll check for the spring inside the filter. Was the oil actually getting filtered at all this way?

Bob Wessner · « **Reply #9 on:** December 22, 2009, 09:56:34 AM »

I'm guessing no, at least not reliably. Normally the oil is forced through the filter, assuming everything is intact. Should the filter become clogged, the pressure goes up and a pressure relief valve allows the oil to bypass the filter. Honda's feeling was dirty oil was better than no oil at all under the circumstances.

gmonkey · « **Reply #10 on:** December 22, 2009, 10:14:13 AM »

So should I be checking bearings for scoring? The oil already looked like crap when I drained it.

lrutt · « **Reply #11 on:** December 22, 2009, 11:18:27 AM »

I'd just change the oil and flush it good with a follow on oil change after a few hundred miles. Remember, all the old hondas as well as brit bikes had no oil filters either.

gmonkey · « **Reply #12 on:** December 22, 2009, 11:31:40 AM »

That's reassuring, thanks.

Is there a way to flush the system with the engine out of the frame? Maybe drop the pan to clean it out, fill with new oil and run the engine with the starter?

ekpent · « **Reply #13 on:** December 22, 2009, 11:59:33 AM »

You can drop the pan to see if there are any heavy metals in there but the "flush" will work best when the oil is hot and circulating through the engine after you get it back in.

Bodi · « **Reply #14 on:** December 22, 2009, 05:12:56 PM »

The spring and washer just hold the filter in place, there is no "pop-off" action related to spring pressure. The bypass valve that lets oil flow past a clogged filter is entirely inside the "bolt". If the spring and washer are missing the filter can slide up and block the bypass port, making it inoperative.

Bob Wessner · « **Reply #15 on:** December 22, 2009, 06:10:15 PM »

Thanks for clarifying how it all fits together.. er, or doesn't in some cases.

gmonkey · « **Reply #16 on:** December 22, 2009, 07:46:03 PM »

So what you're saying is that it's actually sort of the opposite problem if the spring is missing, i.e. it WILL filter but won't bypass if the filter is clogged, or am I not understanding you correctly?

TwoTired · « **Reply #17 on:** December 23, 2009, 12:40:18 AM »

Inside the mount bolt is a pressure relief valve and spring (in case the filter clogs, the oil can bypass the filter instead of staving the engine of oil).
Outside the mount bolt is a spring and washer. The spring holds the filter against the engine block so that oil can get pushed through the filter. The washer protects the rubber seal on the filter cartridge.

If there was no outer spring and washer in your assembly, the filter was just along for the ride and not doing any filtering. Unfiltered oil was being circulated in the running engine.
This may or may not damage anything inside. It all depends on what impurities have been in the oil. If there aren't any bits in the oil that can scratch things, no harm.
In the old days, engines ran a long time with no oil filter, but rather frequent oil changes. But, most agree that is it better to have a filter if you wish extended oil change intervals.

Bodi · « **Reply #18 on:** December 23, 2009, 05:18:14 PM »

TT, I think the hole in the "bolt" where oil enters the centre bore is located where the filter will not slide over it, so even a springless filter will still filter the oil. It could slide to the housing end and cover the bypass valve entry hole though, I don't have one apart here but recall that was my conclusion when I looked at one years ago. The bypass wouldn't work, but it would filter OK.
I wouldn't suggest skipping the spring and washer!

TwoTired · « **Reply #19 on:** December 23, 2009, 06:32:40 PM »

Quote from: Bodi on December 23, 2009, 05:18:14 PM

TT, I think the hole in the "bolt" where oil enters the centre bore is located where the filter will not slide over it, so even a springless filter will still filter the oil. It could slide to the housing end and cover the bypass valve entry hole though, I don't have one apart here but recall that was my conclusion when I looked at one years ago. The bypass wouldn't work, but it would filter OK.
I wouldn't suggest skipping the spring and washer!

Yes, I see what you are saying, and tend to agree. I went out and looked at a spare housing, filter, and bolt. It doesn't slide in far enough to clear the center bolt holes on it's way to the outfeed. But, under pressure, the unfiltered oil can seep past the filter rubber to bolt interface at both ends of the filter.
Al least it should still filter out any large clumps that would cause scoring inside the motor.

As long as the filter doesn't get too clogged, it shouldn't lead to disaster because that spring and washer are missing.

Good catch, Bodi!

Cheers,

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Author Topic: Missing oil filter housing parts? (Read 4414 times)