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Author Topic: Sludge Trap  (Read 887 times)

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Offline britman

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Sludge Trap
« on: November 30, 2021, 09:11:06 AM »
Vintage British bikes have a sludge trap, "AKA"- Satan's Little Cave, The Hell Hole, Debris Hotel, so on and so forth.  Vintage Hondas do not have a sludge trap, some do however have an "Oil Slinger", which can be a PITA to clean, but you can get to it.   When a Sludge Trap is neglected or only partially cleaned during a rebuild, it will come back to bite you square in the arse, causing major damage to your checking account.  I thought I would pass this little life lesson on to anyone owning or considering an antique British machine.  Feel free to get this laminated and put in your wallet, mind currently has a lot of extra room............


« Last Edit: December 01, 2021, 06:46:17 AM by britman »
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Offline Prospect

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Re: Sludge Trap
« Reply #1 on: November 30, 2021, 09:40:10 AM »
What does the sludge trap do and where is it located?
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Offline Don R

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Re: Sludge Trap
« Reply #2 on: November 30, 2021, 05:32:01 PM »
 I believe a GL1000 also has a sludge trap. Located conveniently behind a frame rail.
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Offline Prospect

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Re: Sludge Trap
« Reply #3 on: November 30, 2021, 06:48:32 PM »
Quote from: Don R on November 30, 2021, 05:32:01 PM
I believe a GL1000 also has a sludge trap. Located conveniently behind a frame rail.
Ahhh. I get it. Yes the GL1000 has a sludge trap but they call it an oil screen. I'm working on the GL1000 this winter and I was going to clean it but the manual says you have to pry the frame 2mm and then try and get the JIS screws undone. From what I have read on forums there is never anything in there anyway unless your clutch plates are disintegrating.
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Current Bikes

1969 CB750  Sandcast #256
1971 CB750K1
1972 CB750K1
1975 CB400F
1975 GL1000 Goldwing
1954 Harley Davidson Panhead
1957 Harley Davidson Panhead

Toronto Canada

Offline Alan F.

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Re: Sludge Trap
« Reply #4 on: November 30, 2021, 07:39:49 PM »
Like this one on my CB160?
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Offline Prospect

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Re: Sludge Trap
« Reply #5 on: December 01, 2021, 07:53:12 AM »
Yes. I remember my cb350 twin had the same setup.
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Current Bikes

1969 CB750  Sandcast #256
1971 CB750K1
1972 CB750K1
1975 CB400F
1975 GL1000 Goldwing
1954 Harley Davidson Panhead
1957 Harley Davidson Panhead

Toronto Canada

Offline desertrefugee

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Re: Sludge Trap
« Reply #6 on: December 01, 2021, 07:56:13 AM »
Quote from: Don R on November 30, 2021, 05:32:01 PM
I believe a GL1000 also has a sludge trap. Located conveniently behind a frame rail.

Yes they do! And its convenient location means that it is often neglected as well. Reason being that to access it, the engine needs to be pulled. Not one of Honda’s finest design configurations.
« Last Edit: December 01, 2021, 07:57:46 AM by desertrefugee »
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'86 Vmax, '83 ZN1300, '78 GL1000, '75 CB750 K5, '78 F4

Offline britman

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Re: Sludge Trap
« Reply #7 on: December 01, 2021, 08:34:05 AM »
If you have 5 or 6 extra minutes this video covers the British removal process extremely well.  Talk about a fault in design.  The main problem in rebuilds by back yard mechanics in Triumph land is they clean the outer hole of the trap and never pull the actual tube where the bad build up is located.  That is what happened in my case.  I am looking at new liners and going back to standard bore since I was already 40 over from the last time the motor was done.  A lot of machine shop work and mad money.  I am thinking about maybe selling a kidney........

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Offline desertrefugee

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Re: Sludge Trap
« Reply #8 on: December 01, 2021, 08:58:07 AM »
I love the nicknames that have been attached to the British version of this little hellhole!
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'86 Vmax, '83 ZN1300, '78 GL1000, '75 CB750 K5, '78 F4

Offline faux fiddy

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Re: Sludge Trap
« Reply #9 on: December 01, 2021, 01:53:58 PM »
Quote from: Prospect on December 01, 2021, 07:53:12 AM
Yes. I remember my cb350 twin had the same setup.

450 dohc has an oil slinger, too.
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Offline spotty

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Re: Sludge Trap
« Reply #10 on: December 01, 2021, 03:35:24 PM »
the XS650 also has a sludge gauze filter, which can split and if not checked and cleaned during service will deposit a sh1t ton of highly unpleasant cr4p straight into the crank area of the bike causing  expensive , not to mention catastrophic, damage up to and including the collapse of big end bearings, bending of rod as the piston hits the valves and other associated stuff.

ask me how i know this.......

i got 250 miles out of that bike from purchase to selling it to the wreckers for about 10% of what i paid, lesson there is - do a proper service as soon as you buy an unknown quantity
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i blame Terry
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