Author Topic: Oil tank drain washers  (Read 3095 times)

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kaysystems

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Oil tank drain washers
« on: June 05, 2009, 05:22:42 PM »
CB750 K0

What washers are supposed to be on the oil tank drain plug? The parts manual suggests two, of different sizes.

I have on cupped washer that leaks.

thanks guys...

David

Online Alan F.

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Re: Oil tank drain washers
« Reply #1 on: June 05, 2009, 05:27:19 PM »
They're really dirt cheap, I'd order up a set, the other one will probably fit your sump's drain plug.

Offline Bob Wessner

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Re: Oil tank drain washers
« Reply #2 on: June 05, 2009, 05:39:33 PM »
They are 12mm washers, same one is used for the oil pan drain as well. Buy a fist full, change them each time is my advice.
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Offline Jonesy

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Re: Oil tank drain washers
« Reply #3 on: June 05, 2009, 05:43:41 PM »
The Honda dealer looked them up for me when I bought other oil change supplies. They recommended replacing them every other oil change.
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kaysystems

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Re: Oil tank drain washers
« Reply #4 on: June 05, 2009, 05:46:14 PM »
Thanks guys.

Obviously I have a non-standard washer. No wonder it leaks.

David


Offline Johnie

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Re: Oil tank drain washers
« Reply #5 on: June 05, 2009, 07:18:38 PM »
Thanks guys.

Obviously I have a non-standard washer. No wonder it leaks.

David



Sounds like you have the non-standard.  You want what is called a "crush" washer.
« Last Edit: June 06, 2009, 03:00:07 AM by Bob Wessner »
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WHALEMAN

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Re: Oil tank drain washers
« Reply #6 on: June 06, 2009, 07:13:28 AM »
Yours is standard just crushed down all the way. They cup when smashed down. Have to cut off carefully with a hacksaw. don't need to change every other oil change, just when crushed way down. Dan

Offline Bob Wessner

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Re: Oil tank drain washers
« Reply #7 on: June 06, 2009, 07:31:53 AM »
Sounds like I waste some money changing them each time. I wonder what I will do with the extra $1 or so a year? Where's Bernie Madoff when you need him? Oh, yeah, prison.  :D
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Offline 754

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Re: Oil tank drain washers
« Reply #8 on: June 06, 2009, 09:02:47 AM »
I think I used to get them off with Vise Grips..IIRC

Grab the OD of washer, and turn bolt out with wrenchorsocket.

I reused them a lot, just wipe them off and make sure they are clean, I never torqued them real tight, if you are careful you will find they dont have to be real tight, but check a few times to see that they dont loosen.
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Offline Steve F

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Re: Oil tank drain washers
« Reply #9 on: June 06, 2009, 09:15:16 AM »
I have yet to replace them  ::)  Maybe I should look into replacing my non-leaking washers?

WHALEMAN

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Re: Oil tank drain washers
« Reply #10 on: June 06, 2009, 03:49:10 PM »
If they have never been replaced they should be. Both drain plugs use the same crush washer. Dan

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Re: Oil tank drain washers
« Reply #11 on: June 06, 2009, 06:00:52 PM »
If it ain't broke, don't fix it.
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Offline Johnie

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Re: Oil tank drain washers
« Reply #12 on: June 06, 2009, 07:28:45 PM »
If it ain't broke, don't fix it.
Totally agree with that statement!!!
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1973 CB750K3 - Candy Bacchus Olive or Sunflake Orange
1970 Chevy Chevelle SS396 - Cortez Silver
1976 GL1000 Sulphur Yellow

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WHALEMAN

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Re: Oil tank drain washers
« Reply #13 on: June 07, 2009, 04:31:54 AM »
Your right don't fix it until it starts leaking oil on your tire at 80MPH. Good advice. Dan

Offline 754

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Re: Oil tank drain washers
« Reply #14 on: June 07, 2009, 08:28:41 AM »
They dont just start leaking. They usually leak from grit getting in between the surfaces while tightening. Thise should have been wiped off clean anyway.
 
 I from experience know better that to try to change out a non-leaking part, just because it is a "good idea". That is just asking for something to go wrong.
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Offline Steve F

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Re: Oil tank drain washers
« Reply #15 on: June 08, 2009, 07:53:06 PM »
I will sometimes buy new parts like this "just in case", and end up not using them for years.  Then there are other times I totally miss the obvious until it's too late.

Offline Bob Wessner

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Re: Oil tank drain washers
« Reply #16 on: June 09, 2009, 06:34:06 AM »
If they have never been replaced they should be. Both drain plugs use the same crush washer. Dan

I guess I consider these washers consumables, so I probably won't change my extravagant ways.  ;) However, particularly in the case of the oil pan washer, how many posts have we seen re: cracked pans, usually around the drain hole. Guess what's causing it?
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Offline 754

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Re: Oil tank drain washers
« Reply #17 on: June 09, 2009, 07:12:58 AM »
Overtightening..
 There comes a point, when checking a leaking assembly , that if it is already tight, you should realize, the sealing element needs replacing. Further tightening usually causes damage. (espescially in aluminum)

 That being said though, Carefully cleaning the grit off the washers, has resulted in long life for many.

 I am trying to recall, if I ever changed them in at least 50 K on cb 750,s .
Maker of the WELDLESS 750 Frame Kit
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Kelowna B.C.       Canada

My next bike will be a ..ANFOB.....

It's All part of the ADVENTURE...

73 836cc.. Green, had it for 3 decades!!
Lost quite a few CB 750's along the way

Offline kach_me

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Re: Oil tank drain washers
« Reply #18 on: September 19, 2009, 01:45:03 PM »
Would a worn out washer cause the bolt not to tighten?  I changed the oil today and the bolt would get finger tight then loosen as I turned it with a socket.  At finger tight, it seems to seal the oil while running but leaks fairly badly when not running (a drip every 20 seconds or so).  I am afraid that I've got stripped threads.  Any thoughts?
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Offline mystic_1

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Re: Oil tank drain washers
« Reply #19 on: September 19, 2009, 01:46:38 PM »
Stripped threads or a cracked bung.

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Offline BVCB650

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Re: Oil tank drain washers
« Reply #20 on: September 19, 2009, 01:48:01 PM »
If they have never been replaced they should be. Both drain plugs use the same crush washer. Dan

I guess I consider these washers consumables, so I probably won't change my extravagant ways.  ;) However, particularly in the case of the oil pan washer, how many posts have we seen re: cracked pans, usually around the drain hole. Guess what's causing it?





Mine doesn't have one. Just the tapered bolt. The one on my Jeep has lasted over 150K miles with no leakage. It is copper. I know I'm supposed to have one by the drawings, but I don't think my plug is OEM.
« Last Edit: September 19, 2009, 01:52:20 PM by BVCB650 »
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Offline kach_me

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Re: Oil tank drain washers
« Reply #21 on: September 19, 2009, 01:52:04 PM »
Stripped threads or a cracked bung.

mystic_1

In the pan?  If stripped threads any thoughts?  heli-coil?  or oversized bolt? Or am I looking at a new pan?  Lots of questions.  Oh yeah, '76 750K with no mods. 
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Re: Oil tank drain washers
« Reply #22 on: September 19, 2009, 02:17:16 PM »
If I had a pan with stripped threads I'd prefer an oversized bold rather than a helicoil or other insert.  OTOH a good insert would be stronger than stock and would allow you to use the stock drain screw and crush washer.

YMMV.

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Offline kach_me

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Re: Oil tank drain washers
« Reply #23 on: September 19, 2009, 04:38:30 PM »
What oversized bolt would you use? 
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Offline bucky katt

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Re: Oil tank drain washers
« Reply #24 on: September 19, 2009, 04:47:32 PM »
we replaced them every oil change at the trump/beemer dealer.
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