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Speedo and Tacho dashpot?

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Seabeowner:
Thanks for that Ash. I found a thread from 2018 where you and Peter talked it over. Ordered 30000 cSt, but I see Lecram uses 100000. Not sure how I'm going to get it it. Don't think they will let me have the syringe after my booster shot.

kent400:
You don't mention whether the gauge is ND on Seiki. The filling of the damper can be different between the two types and the on some of your machines on your profile if could be either of the two types. You silicone you need is 100000.   

Seabeowner:
They are Nippon Seiki 500s. Presume 100000 is really thick, how do you get it in?

kent400:
Assuming the gauge design is the same as shown is the image you will find after removing the face there is a small 5mm brass nut. If you unscrew that you will be able unscrew the damper bush. You need to take note of how much thread is protruding from the brass nut to ensure it goes back with the same amount of thread
visible.

 You can then 'dribble' some silicone fluid down the needle pin and put some on the damper bush. Check that improve the damping effect. There is another type of Seiki mechanisms where it not possible to unscrew the bush.  Although the mechanisms appear the same so you have to either remove the front of the mechanism by folding back the tabs that are formed from the frame or drill a tiny hole in the damper body and put some silicone in it. Reseal the hole with some mastic. Obviously great care is required, a centre drill bit and a hand drill.     

Seabeowner:
Absolutely perfect. Thanks very much Peter for taking the time. Looks just like mine. Will have a go at the nut tomorrow, best not started late in the day. Oil available on ebay.

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