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Author Topic: Oil Filter Covers - Which is Which?  (Read 597 times)

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Offline Dr. Frankenstein

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Oil Filter Covers - Which is Which?
« on: October 21, 2025, 02:54:26 PM »
I found this shorter oil filter in a box of parts with the '72 CB350Four I'm working on, but when I got the bike as a basket case, it had the longer of the two seen here on it; can anybody tell me which is which? I think the shorter one is for the 350F, but I'm not sure.
« Last Edit: November 22, 2025, 04:53:15 AM by Dr. Frankenstein »
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Offline jlh3rd

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Re: Oil Filter Covers - Which is Which?
« Reply #1 on: October 21, 2025, 03:20:02 PM »
cms shows the taller one as a match.
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Offline Ozzybud

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Re: Oil Filter Covers - Which is Which?
« Reply #2 on: October 21, 2025, 03:31:29 PM »
Taller one on both my 350f's

My 400F,550K and 750F all have the shorter one.
Same filter inside i believe.
« Last Edit: October 21, 2025, 03:34:11 PM by Ozzybud »
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1976 Z50A PARAKEET YELLOW
1970 CT70  CANDY SAPPHIRE BLUE
1971 CT70H CANDY TOPAZ ORANGE
1972 CT70H CANDY EMERALD GREEN
1973 CL200 CANDY RIVIERA BLUE
1974 CB350F GLORY BLUE BLACK METALLIC
1973 CB350F FLAKE MATADOR RED
1975 CB360T LIGHT RUBY RED
1975 CB400F VARNISH BLUE
1975 CB550 FLAKE SUNRISE ORANGE
1976 CB750F CANDY ANTARES RED

Offline Dr. Frankenstein

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Re: Oil Filter Covers - Which is Which?
« Reply #3 on: October 21, 2025, 03:38:34 PM »
Okay, cool - good to know it had the right one on there.
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Offline bryanj

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Re: Oil Filter Covers - Which is Which?
« Reply #4 on: October 21, 2025, 04:24:51 PM »
Longer one should have a loose spacer on the oil filter bolt i think
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Offline Dr. Frankenstein

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Re: Oil Filter Covers - Which is Which?
« Reply #5 on: October 21, 2025, 06:42:51 PM »
Yes, it does.
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Offline HondaMan

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Re: Oil Filter Covers - Which is Which?
« Reply #6 on: October 21, 2025, 08:05:33 PM »
Yep, mine is the longer one, with a long spacer on the bolt (on the engine side) to hold the filter forward.
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Offline carnivorous chicken

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Re: Oil Filter Covers - Which is Which?
« Reply #7 on: October 22, 2025, 08:48:16 AM »
Yep, 400F shorter, 350F longer -- but the 400F works on 350F of course (without the spacer!)
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Offline HondaMan

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Re: Oil Filter Covers - Which is Which?
« Reply #8 on: October 23, 2025, 11:46:54 AM »
Just a musing...I've long wondered if the "long" oil filter housing was a way of sneaking some extra oil into the 350F's engine?
I discovered early on that the regular one fits and works, when a college kid ran his into a concrete parking block (after the front wheel bounced over it) and broke it. Getting the 'correct' one was going to down the bike for 2 weeks and it was his only transport, so he ended up with a short one. That spacer kicked around the shop for years...
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See SOHC4shop.com for info about the gadgets I make for these bikes.

The demons are repulsed when a man does good. Use that.
Blood is thicker than water, but motor oil is thicker yet...so, don't mess with my SOHC4, or I might have to hurt you.
Hondaman's creed: "Bikers are family. Treat them accordingly."

Link to Hondaman Ignition: http://forums.sohc4.net/index.php?topic=67543.0

Link to My CB750 Book: https://www.lulu.com/search?adult_audience_rating=00&page=1&pageSize=10&q=my+cb750+book
Link to My CB500/CB550 Book: https://www.lulu.com/search?sortBy=RELEVANCE&page=1&q=my+cb550+book&pageSize=10&adult_audience_rating=00
Link to website: https://sohc4shop.com/  (Note: no longer at www.SOHC4shop.com, moved off WWW. in 2024).

Offline carnivorous chicken

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Re: Oil Filter Covers - Which is Which?
« Reply #9 on: October 23, 2025, 03:50:19 PM »
Quote from: HondaMan on October 23, 2025, 11:46:54 AM
Just a musing...I've long wondered if the "long" oil filter housing was a way of sneaking some extra oil into the 350F's engine?
I discovered early on that the regular one fits and works, when a college kid ran his into a concrete parking block (after the front wheel bounced over it) and broke it. Getting the 'correct' one was going to down the bike for 2 weeks and it was his only transport, so he ended up with a short one. That spacer kicked around the shop for years...

It's a good question, and we've mused over this before. How much more oil, though, really? half a pint? Maybe for more circulation in the filter housing -- but why? Aesthetically the filter didn't really stick out much from the original 4-4 pipes, but I think the longer filter would have been more noticeable on the 400Fs wraparound header.
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