Sight glass.

No probes. I'll let you know. Doing the NC500 next week so ain't going to tackle a potential problem like this until afterwards. All the best

 

Ah..... Thanks for that. If there is a sealing washer, by inference the sight glass must unscrew. I'll order the washer and give it ago. Many many thanks. I take it you own a Thunderbird 900.

 

I fear I am in awesome company here, ha ha.

 

Strewth... Thought to try how tight the sight glass was threaded into the block. Put 22mm ring spanner onto nut faces and found it was barely finger tight. So friends.... it does unscrew and need to be aware ... take note of my lesson...... haven't touched sight glass ever, and I could have lost it on a run. Nipped it back up because haven't got the sealing washer yet.

 

Just to finalise this item. The sight glass unscrewed easily with a 22mm ring spanner. With a new seal, I refitted the sight glass with ease. Sadly, once removed, it became clear that the inside of the glass was as clean as a whistle. The problem of not seeing the oil level clearly has nothing whatsoever to do with dirt on the inside of the glass. The sight glass is too small to view the level easily ; viewing is best achieved with a powerful torch, and a lot of prayer that you viewed it correctly.