Author Topic: Gearbox blanking seal.  (Read 3665 times)

Offline royhall

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Gearbox blanking seal.
« on: February 12, 2016, 04:44:32 PM »
Is it possible to change the main shaft oil seal (34x9mm) on a 400F without splitting the cases. Its the seal that is a blacking piece with an oil supply right underneath (just in front of the sprocket). My mates bike is weeping oil past this seal. Funny, I was only talking about that same thing 2 days ago, think I will also check that seal on my 350F.
« Last Edit: February 12, 2016, 07:30:08 PM by royhall »
Current bikes:
TriBsa CCM 350 Twin
Honda CB350F in Candy Bacchus Olive
Honda CB750F2 in Candy Apple Red
Triumph Trident 660 in Black/White
Triumph T100C
Suzuki GS1000HC
Honda CB450K0 Black Bomber
Honda CB750K5 in Planet Blue Metallic (Current Project)

Offline Bodd

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Re: Gearbox blanking seal.
« Reply #1 on: February 12, 2016, 07:57:15 PM »
Do you mean this ?

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Offline mike the bike

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Re: Gearbox blanking seal.
« Reply #2 on: February 12, 2016, 08:26:38 PM »
I'm sure that seal's got a locating tab sticking out and possibly a flange as well to keep it firmly located.   Whereas removing it with a screwdriver is do able,  refitting the new one is an unlikely prospect without opening up the crankcases a tadge.
Where's that 10mm socket got to?

Offline Bodd

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Re: Gearbox blanking seal.
« Reply #3 on: February 12, 2016, 08:30:36 PM »
It has got a tab sticking up but no flange (No 272 in the picture), I suppose how flexible it is will determine if it will go in without splitting/lifting the cases.

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Offline royhall

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Re: Gearbox blanking seal.
« Reply #4 on: February 12, 2016, 08:35:52 PM »
That's the one Bodd. If its the same as the 350F it definitely has a dowel shape tab on it.There's a quite large weep of oil coming out at about the 5 o'clock position, right about where the oil feed is under the seal. Do you know of anybody that has successfully changed that seal without a stripdown, or a way of re-sealing it in situ. Don't mind helping him with a seal change but I don't want to get involved in his stripdown, don't have the time at the moment. Think I will get him to order a new seal then I can have a look at how flexible they are etc. Cheers.
« Last Edit: February 12, 2016, 08:38:50 PM by royhall »
Current bikes:
TriBsa CCM 350 Twin
Honda CB350F in Candy Bacchus Olive
Honda CB750F2 in Candy Apple Red
Triumph Trident 660 in Black/White
Triumph T100C
Suzuki GS1000HC
Honda CB450K0 Black Bomber
Honda CB750K5 in Planet Blue Metallic (Current Project)

Offline Bodd

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Re: Gearbox blanking seal.
« Reply #5 on: February 12, 2016, 08:53:47 PM »
I don't know if anyone has ever replaced one in situ but if it was me I would give it a try, it looks like the tab isn't too big or too far from the edge so I would put it in at an angle locating the tab first then tap it into place, I would also put a smear of Hylomar on it.

Offline dave400

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Re: Gearbox blanking seal.
« Reply #6 on: February 12, 2016, 09:53:07 PM »
I'm sure that plug is rubber formed over a metal cup, I remember it was not very flexible when I replaced it during my 400 engine rebuild....it will probably be a job and a half putting a new one in and not deforming it.

Offline Bodd

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Re: Gearbox blanking seal.
« Reply #7 on: February 12, 2016, 10:06:56 PM »
You are right about the metal cup dave400, this is what it looks like on the DS website, I would still be tempted to have a go though.

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Online Bryanj

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Re: Gearbox blanking seal.
« Reply #8 on: February 13, 2016, 10:27:44 AM »
Sorry not worth wrecking a gearbox trying to do a half assed job

Offline Bodd

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Re: Gearbox blanking seal.
« Reply #9 on: February 13, 2016, 10:40:27 AM »
How is it going to wreck the gearbox ? It doesn't move, doesn't affect any moving parts and if nothing leaks past it it is doing it's job.

Offline royhall

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Re: Gearbox blanking seal.
« Reply #10 on: February 13, 2016, 11:04:03 AM »
Replacing the leaking crank seal on my 350F (that I stupidly put in the wrong way round) was a half assed job, but it worked a treat. Surely got to be worth a try at the cost of a seal just as long as were very careful. If it doesn't work the engine was coming out anyway, he cant use the bike as it stands.
Current bikes:
TriBsa CCM 350 Twin
Honda CB350F in Candy Bacchus Olive
Honda CB750F2 in Candy Apple Red
Triumph Trident 660 in Black/White
Triumph T100C
Suzuki GS1000HC
Honda CB450K0 Black Bomber
Honda CB750K5 in Planet Blue Metallic (Current Project)

Offline Bullit

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Re: Gearbox blanking seal.
« Reply #11 on: February 13, 2016, 02:46:17 PM »
If it's just a blanking plug does the dowel need to be there? Could it be dremel'd off???

Offline mike the bike

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Re: Gearbox blanking seal.
« Reply #12 on: February 13, 2016, 06:32:47 PM »
Don't see why not.   I would avoid using Hylomar in this instance in favour of 'Sticks like Sh*t'  (from Screwfix) because of its superior adhesive qualities.  If that plug loosened itself while you were riding it would spoil your day.
Where's that 10mm socket got to?

Online Bryanj

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Re: Gearbox blanking seal.
« Reply #13 on: February 13, 2016, 11:24:58 PM »
If its in wrong it afdfects the oil flow thats why the peg

Offline Bodd

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Re: Gearbox blanking seal.
« Reply #14 on: February 14, 2016, 09:21:20 AM »
How can it affect the flow ? It's a symmetrical cup.

 

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