Early 1.9dg stat and pump

[Dazco]

Currently replacing the above mentioned parts. Whilst stripping it all down ive found a thin smear of silicone looking sealant. From what I've read its a big no-no , what can I use on the faces to form a good seal ? I dont want to rely on gaskets alone.
Just call me a chicken
Ta very much
Daz

[shepster]

Blue Hylomar or similar.

[Dazco]

Ta

[CovKid]

Well, there are clear sealants that handle temperatures up to 600 degrees, many of which even leave hylomar standing. This is probably what you've come across rather than aquatic sealent. I used a clear high-temp sealant AND gaskets when i assembled mine. Didn't want to have to revisit due to a failed gasket.

[Dazco]

Didn't want to have to revisit due to a failed gasket.

That was my way of thinking aswell

[CovKid]

One particular area I didn't want leaks was on the o-ring on the pipe that slides into thermostat block. Thats where I used it mainly as its easy to damage or even dislodge the seal with all the faffing around involved and it also helps that pipe slide in better I found.

Interestingly, prior to me owning it, my Caravelle had always been serviced by VW and I also found this sealant on that pipe so I'm fairly certain they discovered this could be a potential leak point and used the sealant as a belt n braces approach. I'm not sure if this was an issue with later thermostats but it may account for the change in design. Once everything was bolted down, I also squeezed a little more into the gap around the pipe. Had no leaks anyway.

As VW have demonstated many times, rules are broken sometimes.

[Ian Hulley]

Blue Hylomar or similar.

Yep. ^^

Ian

[Dazco]

All done . Had a broken drill in one of the thermostat cap holes , turned the cap a couple of degrees and re drilled and tapped . Jobs a good un