020AV Super/chain oil cap query

[PeakRanger]

Hello all, can I ask what might on reflection seem like a 'newbie's' question?

My recently acquired 020AV runs brilliantly. However, there's chain oil escaping from the little hole on top of the oil filler cap (when used at angles etc). Now, obviously I'm missing the underside of the cap, with a retaining chain (as on the fuel cap) and some sort of seal/rubber/stopper. 

My question is this ... Does the design on the old 020AV necessitate the oiling system to have capacity to breathe through this outlet? Or can I plug the hole to prevent leakage? I'd have thought the oil chamber would be completely sealed (as in newer saws). 

The tech chap at Stihl UK wasn't sure on the phone, he simply provided me with a part number. Nice chap, helpful as he could be so I'm not knocking anyone. 

Also I've had some advice from an experienced mate. Just wanted a few impressions or suggestions from the 'old school' out there.

I'm trying to locate a replacement cap which ain't as easy as I thought. 

Cheers in advance. 

[spudulike]

If there is no external breather and the Cap hole is the only way for the tank to breath, the hole must allow for air to enter the tank as oil is used otherwise a vacuum will occur - swig in a bottle of beer and you will get to a point where no more beer will come out until sir is allowed in to replace beer swallowed!

[PeakRanger]

Makes sense !

Thanks for the reply. 

 

Has anyone got a spare kicking about?!? Haven't been able to find anything in the UK. 

[EricBradley]

There is a guy on ebay selling a couple of 020av crankcases, hes helpful and may sell you one of the caps out of them. Are you sure the chain and bit that pushed into the cap isn't swimming around in the oil tank?

 

https://www.ebay.co.uk/itm/GENUINE-STIHL-020-AV-CHAINSAW-ENGINE-BOTTOM-END-CRANKSHAFT/263690071012?hash=item3d65272be4:g:BewAAOSwpINZY-KY

[PeakRanger]

Thanks for the reply. Yes I've emptied the chain oil and had a good probe around. Nothing there. I think I may have found one online (UK thankfully), but if it pans out fruitless I'll give the chap a shout.

Cheers again ! 

[PeakRanger]

For the price I might as well !