Oil leak next to the spark plug

Ducaddicted · Post by **Ducaddicted** » Thu Apr 27, 2006 7:34 pm

Hi guys,

I'm giving my Paso 87 a full Maintenance Service. However I
noticed i have a leak next to the spark plug of the vertical
cylinder. A few centimeters to the right of the spark plug
is a small screw. At this screw i have an oil leak. I noticed
that the horizontal cylinder has the same screw next to the
spark plug.

What's the use of this screw ? Can't find the answer in the
manual. Somehow the screw has to block the oil of coming
out of the cylinder. :thumbdown:

The nasty thing is that the screw is so thightly that i can't get
it loose. I sprayed some creaping oil (WD-40) on it.
Creaping Oil, is that english ?

Is there at the end of the screw a contra-nut perhaps ?
Does anybody know ? Do I have to dismantle the upper cylinderhead before i can loosen the screw. :screwy:

This must be a leak that other paso drivers have had.

greetz,

Steven

Post by **Skins** » Thu Apr 27, 2006 7:49 pm

That kind of oil is often called 'penetrating oil' in English.

The screw is probably to stop the end of an oilway that was drilled into the head after it was cast. It is probably best not to remove it. You could clean around it with a solvent, and then seal it with a high-temperature compound of some sort.

Ducaddicted · Post by **Ducaddicted** » Thu Apr 27, 2006 7:58 pm

Hi Skins,

You say best not to remove the screw but i have the impression
that this screw has already been changed. The screw on the
horizontal cylinder is dark brown, maybe because it takes a lot
of dirt from the front wheel.

The colour of the screw on the vertical cylinder is gold. I must
check if it really gold, if so the screw comes out, whatever it takes.
:funny:
Unfortunately it's will be a compound of iron or copper ?

I strongly believe that it's possible to change the screw. But
i would like to hear if any other paso drivers already done this.
If so, how did they do it ?

speedtrifle · Post by **speedtrifle** » Sun Apr 30, 2006 1:10 pm

It is an oilway blanking screw and would have been locked in place with a strong thread locking compound at the factory.

The compound had probably crystalised over time, hence the leak, but it will still be extremely difficult to remove so I suggest you take Skins' advice and seal over the top with some high temperature silicone compound if it proves difficult to shift.

This is what I have done as there was no way mine was going to come out.