Venus 178 hour counter creep

[watchfellow]

Hi everyone,

I put together a Venus 178 recently, but found that the hour counter "creeps" ie. runs when the chrono is disengaged. This is the similar type of setup as the Omega 861, where the hour counter is driven off the mainspring barrel, but stopped when the chrono is disengaged by a friction spring. 

Am I correct in assuming that the friction spring for the hour counter driving pinion should be dry? I am guessing that the issue will be either the spring or the driving pinion, but while the driving pinion has some wear the spring looks decent. 

I've attached a couple of photos in case anyone has any tips. Thanks in advance!

[Delgetti]

https://watchguy.co.uk/cgi-bin/files?showfile=Venus/Venus 178.pdf&filename=Venus 178.pdf&dir=Technical Manuals&action=documents

 

The hour recorder is driven by the barrel and it will only stop if it is held by the hour recorder stop lever 8690. So I would check if this lever (powered by the spring 8691) is really holding the hour recorder in the "chrono off status".

I haven't worked on a Venus 178 so far, but on an Omega 861 I chose 9501 grease for the friction spring as it's moving very slow at quite high tension.