Another small milestone reached yesterday with the completion and fitment of the original heater boxes.
I know I’ve got a perfect set of VW NOS items in my pension pot, but the pleasure enjoyed from saving the originals is wonderful!
Before we kick off, a little safety warning – when using a wire brush attachment in a drill, don’t wear latex inspection gloves!

A close one!
Anyway…. Once I’d finished with the brush in the drill, the front part of the heater boxes looked like this.

Next up was to coat the insides with some form of paint. I decided to use exhaust VHT paint which didn’t require baking. I can only report that after welding the J tube and flange on them when they were painted, even after glowing red hot, the paint didn’t come off, so it must be good stuff. The flash on the camera makes it look grey, but it is in fact a dark matt black.

Along with the internal hardware…

Which went back together a treat…

Next job was to fit the exhaust flange to the head so it was in the correct position when welded up.

I then loosely fitted the J tube in the heater boxes and joined the 2 halves together for the first time. The outside is yet to be painted at this stage until after it is welded.


With everything fitted to the engine and exhaust system, it was just a case of making sure the boxes were in the right position and all square, as I’d taken accurate measurements of gaps and clearances before I dismantled them. Then I made a couple of tack welds to the flange and where the pipes exit the boxes. I decided to make the welds where the pipe exits the heater boxes a little more substantial than the flimsy factory tabs which had broken off in a few places anyway.




Once I’d welded the pipe in fully, I then painted the rest of the pipe inside. The large hole where the heater channel fits allowed enough access to paint the blind side of the pipe.

Although the original exhaust flange was only welded on the outside for economy, I decided that whilst I had the opportunity, I’d weld the inside joint also, for strength, longevity and a belt and braces approach to sealing the join. Once I’d welded it, I ground the mating face perfectly flat to remove any distortion that the welding may have induced that might have compromised the gasket seal.


After a final check of the internal hardware and a grease of all the hinges, pivots and links, I assembled them for the final time and then gave them the first of 3 etch primer coats. For the record, the mechanism inside is now smooth as butter!

Once this had fully dried, I gave them 3 coats of satin black which I don’t expect to endure forever, but it is as good as the factory used and will weather in nicely….

Then, using my NOS fitting kit, I fitted them up to the engine at last…. The pipe is in the VHT paint and isn’t as grey in real life – the flash is playing tricks again.

And there we are – both fitted and ready. I really am over the moon with them!

Cooooool
Edited by user
14 years ago
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Reason: Not specified
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