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Main seal?
- San Arthur
- Posts: 577
- Joined: Sun Apr 22, 2007 2:08 pm
- Location: San Antonio, TX.
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Main seal?
I thought it was the oil drain plug but it is dry.
After further investigation I found oil seeping from between the gear box and the engine.
What do you think, main seal, oil pump gasket? There is also a little oil coming from the pushrod seals too.
Gearbox needs to come off to diagnose?
'58 R26 '76 R90S '88 R100RS '94 R100GS/PD
- schrader7032
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Re: Main seal?
'78 R100/7 '69 R69S '52 R25/2
Fast. Neat. Average. Friendly. Good. Good.
- srankin
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Re: Main seal?
If it is engine oil, (gear oil has a particular smell) and is not migrating back from the push rod seals, then it is most likely the rear main engine seal. 70K or so they can start to go.
So it is a big job, the transmission, clutch, and flywheel will have to be removed.
Note, it is imperative to block the crank at the front of the engine some way to prevent the crankshaft from being moved forward in the bearings. There is a shim in the back that can be dislodged if not done causing problems.
Also, you will need a special tool to properly seat the new seal properly.
The clutch reassembly will need a centering tool as well.
Check out Brook Reams or Boxer two Valve for possible videos on this. Good luck, St.
- San Arthur
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Re: Main seal?
I watched the Boxer 2 Valve videos thanks and think are great.
Kurt, it is motor oil and I agree with you; transmission, clutch and flywheel need to come down.
The odometer was in pieces when I purchase the bike and has only 18k miles since restored. The motorcycle show many more miles. Over all the bike shows its age.
Since I purchase the R90S I have always wanted to repaint the bike.
There is funny story about the color, a former owner have it repaint to Daytona Orange but he was colorblind and received a Yellow Silver paint instead. He “noticed” or was told about the yellow until his son asked him about the odd color scheme.
I checked the VIN and it should be Silver Smoke.
What do you think, is this a good time to repaint the frame, fix some parts and repaint the body work? I need to remove the gearbox, swing arm, drive shaft….
And if so, would you paint it to match the VIN, back to Silver Smoke or Daytona Orange?
'58 R26 '76 R90S '88 R100RS '94 R100GS/PD
- srankin
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Re: Main seal?
Looking at the pictures, it doesn't look like you need to paint the frame or am I just not seeing it?
I am probably the wrong person to ask about paint and stuff because I am picky but not too picky. I won't ever enter a bike in show so if the paint is not the exact shade or whatever, I don't care as long as it is not some weird color or color combination. Same goes for the frame, as long as it is not rusted or terribly scratched up, I will ride it.
So I guess I am saying fix what needs to be fixed, ride it and enjoy it first. Over the winter if you want a project and can afford it, maybe change the paint job. St.
- San Arthur
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Re: Main seal?
Friends; are there a good restoration books for these 70's bikes, something equivalent to the Barrington?
I think it will be a good idea to read such literature before making a decision.
'58 R26 '76 R90S '88 R100RS '94 R100GS/PD
- San Arthur
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Re: Main seal?
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'58 R26 '76 R90S '88 R100RS '94 R100GS/PD
- srankin
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Re: Main seal?
Seems the newest versions of Clymer and hanses manuals are just about useless as they try to cover too many models of airheads in limited space. It makes it hard to follow when doing something for the first time. St.
- San Arthur
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- Joined: Sun Apr 22, 2007 2:08 pm
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Re: Main seal?
'58 R26 '76 R90S '88 R100RS '94 R100GS/PD