Forum

[Marcel]

Hi there,
Today I discovered a small hole approximately 2 mm between the crankcase and the oil reservoir. ( I have the engine '92 classic 612 dimantled)Because the hole is on the top end of the reservoir there will hardly any oil pass through it I suppose but air under pressure from the crankcase will! On the other hand, it's only two mm and and pulsating say 3000 times/minute so i don't think it is a big deal.
Should I have this hole welded? I have never ever had any trouble from it! The hole looks drilled. Why should one drill a hole at that spot? Am I missing something?
Thanks in advance,
Marcel

[Gwilly]

If its the one i'm thinking of its supposed to be there… breathes through the tank instead of under barrel spigot..

Picture would be helpful if possible...

[Beezabryan]

What Marcel describes is correct and is the reason for not filling the oil tank much beyond half on the dipstick

[Norm]

Marcel, it belongs there do not plug

[Marcel]

Thank you for the replies!
Hmm, still wondering why it's there. |I think whith the engine running a 3000 r/m there is hardly any effect of this hole. Any suggestions?
all the best, Marcel

[Phil Ashbrook]

The hole is a breather and overflow , I opened mine up a bit but the tiny hole in the oil cap makes that mod silly as unless one is going to change breather pressure like an JAP ..leave it alone .

[Midge]

Its been discussed before and a photo shown. My '99 has it, certain earlier ones don't. I guess it was just to equalise pressure in the oil tank, its pretty high up so no danger of flooding the crankcase.

[PeteF]

Have a read here
http://www.whfolk.co.uk/REOCHUMBER/Arti ... eather.htm

[Gwilly]

Found it, where i left it….

[Beezabryan]

Apologies all round, my memory must be more than a little defective. Whilst my memory tells me one thing Gwilly photo and mine agree showing a drilling rather than a slot half way down the back of the cases. I wonder what I have seen in the past that put me on the wrong track?