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paulrob100 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote paulrob100 Quote  Post ReplyReply Direct Link To This Post Topic: Fork oil
    Posted: 04 Jan 2019 at 20:22
Hi guys.
 
Can anyone tell me the best way to re-fill the forks on my V50 mk2
 
Thanks, Paul
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George S View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote George S Quote  Post ReplyReply Direct Link To This Post Posted: 04 Jan 2019 at 21:32
There is a drain screw at bottom of fork at rear
Filler allen screw is at top of fork. You might have to move handlebar.
Add 0.07 Lt oil to each leg. Guzzi manual recommends Agip F1 ATF Dexron other oils available.
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iansoady View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote iansoady Quote  Post ReplyReply Direct Link To This Post Posted: 05 Jan 2019 at 11:32
If I remember correctly* the oil in V50 forks is only for lubrication and damping is handled by a sealed damper unit.


*I'm sure someone will correct me if I don't......
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George S View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote George S Quote  Post ReplyReply Direct Link To This Post Posted: 05 Jan 2019 at 12:10
Don't think there is a sealed damper in mk2 
George

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DaveW View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote DaveW Quote  Post ReplyReply Direct Link To This Post Posted: 05 Jan 2019 at 16:45
The V50 Mk 2 has sealed cartridge dampers. (I replaced mine a couple of years ago.) The fork oil is just for lubrication, not for damping.
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paulrob100 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote paulrob100 Quote  Post ReplyReply Direct Link To This Post Posted: 06 Jan 2019 at 22:01
Thanks for the replies.
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GC888 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote GC888 Quote  Post ReplyReply Direct Link To This Post Posted: 14 Jan 2019 at 17:16
Yes they have oil for lubrication only & they do have damper cartridges on the Mk11.

Having sorted mine I would recommend stripping them down to clean out the old gunge accumulated from the 80s till now. Mine were in quite bad shape so had the stanchion re-plated and fitted new seals. But is a very simple construction.

Filling - is an ass of a job as you need to add it down the side of the cartridge! 
removing the plug on the top will not work as normal, I would suggest listening the station in the yoke removing the top plug and sliding the stanchion down the cartridge a little to make a gap between the inner wall of the station and the cartridge. 

Then take your time to drip in the oil wiggling as you go to remove air locks (I used a syringe) Measure what you spill in a catch tray as you will spill some!
  
I would suggest a bit of sealant on the drain plugs and mounting bolt at the bottom of the slider when reassembling.







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Post Options Post Options   Thanks (0) Thanks(0)   Quote TheWrongTrousers Quote  Post ReplyReply Direct Link To This Post Posted: 17 Jan 2019 at 18:10
I am in the middle of tidying up the forks on my LM1.  I heartily agree with GC888 when he says its a good idea to strip them down and remove all the old grunge. It was really horrendous and I am very glad I did it. The question I have is whether some left over 10w fork oil would be ok to put in the forks. I realise that the damping is already taken care of by the sealed units, so I would have thought that my fork oil can do that as well as anything else. Is it really necessary to go out and buy this Agip Dexron stuff ?
Serenity Now !!*!**!!
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red leader one View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote red leader one Quote  Post ReplyReply Direct Link To This Post Posted: 17 Jan 2019 at 19:28
Would you spoil a ship for a ha'porth of tar?
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TheWrongTrousers View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote TheWrongTrousers Quote  Post ReplyReply Direct Link To This Post Posted: 17 Jan 2019 at 19:37
Noooo of course I wouldn't, but I suppose my question was whether fork oil would spoil the ship. Will something bad happen if I put fork oil in it ? Does anyone know ? 
Serenity Now !!*!**!!
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Mike H View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Mike H Quote  Post ReplyReply Direct Link To This Post Posted: 17 Jan 2019 at 19:55
If I remember rightly it's Automatic Transmission Fluid (ATF), as it's for lubrication only.

Do not the fork leg top caps unscrew on the MK2?

On the MK1 I took the centre Allen bolt out, it attaches the top end of the damper; then unscrew the top cap (on the MK1 needs a BIG Allen key, I ended up using an hex socket which I could use a long socket set bar on, can be tight). With that off, oil can be poured in normally no problem. A correct measured amount of course. Also desirable to help all the old to drain out. Not a good idea to take both leg caps off at the same time, without something holding the sump up, else bike will fall foward and the dampers come out the top. Big smile







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TheWrongTrousers View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote TheWrongTrousers Quote  Post ReplyReply Direct Link To This Post Posted: 17 Jan 2019 at 21:27
I wonder how you know that Mike ... ?

Mine has both forks off and is currently supported by a very sturdy square plant pot under the sump. 

So, will 10W fork oil cause problems if I were to use that instead of ATF ?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Brian UK Quote  Post ReplyReply Direct Link To This Post Posted: 17 Jan 2019 at 21:35
Originally posted by Mike H Mike H wrote:

Not a good idea to take both leg caps off at the same time, without something holding the sump up, else bike will fall foward and the dampers come out the top. Big smile

Yes, I managed to do that once. Amazing how far you can reach when you try, one hand holding the bike vertical as it also rolled off the stand, the other reaching for something to prop it up.
Brian.

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GC888 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote GC888 Quote  Post ReplyReply Direct Link To This Post Posted: 18 Jan 2019 at 10:59
Yes its a bad idea 

The auto transmission fluid is much thinner and is less likely to act as a damper 
The design is that it splashes around lubricating but nothing more.  

If that was the full story you could just get away with using a very high quality fully synthetic 0-20 engine oil.... 

But don't - 

Engine oil has the ability to absorb water and release it when hot - the forks will never get hot so over time the oil will fail (the absorption seen in extreme cases is the mayonnaise you get when a head gasket leaks) 

In normal temperatures 0-20 has a higher viscosity than the thickest ATF the thinner ATF has an even lower viscosity. 

Normal fork oil at around 10 will still act to hydraulically damp the fork, I think it will be away off locking it but as ATF is not expensive why chance it .... 

  

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Post Options Post Options   Thanks (0) Thanks(0)   Quote TheWrongTrousers Quote  Post ReplyReply Direct Link To This Post Posted: 18 Jan 2019 at 12:23
Dear GC888. All I have sought to do is to understand the difference that ATF would make. You have explained it perfectly and I am grateful to you. In future nothing other than the finest ATF will enter my front end, as it were.

My thanks to other contributors who also took the trouble to reply. 
Serenity Now !!*!**!!
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