Desooting the intake preheating pipe of an aircooled VW
A blocked pre-heating pipe on a VW aircooled engine may be a major reason for stalling engines shortly after start, especially under humid and or cold weather conditions.
During the restoration of the engine it is quite often forgotten to decarbonize the pre-heating pipe of the intake pipe. You will certainly have heard or read about methods to 'decoke or desoot' this preheating pipe, whatever it is called.
I find it the easiest way to knock the preheating pipe with a hammer so that you 'generate' some trembling of the steel causing soot and rust to come off from the inside of the preheating pipe.
To ensure trembling (resonance) of the steel pipe you can better hold it in one hand and hammer it with your other hand . Do not tighten the pipe in a work bench since this will prevent the steel pipe to 'tremble'.
Knocking with the hammer may take about half an hour to gain a good result, so don't give up !! Do not knock too hard to avoid damages or dents in the pipe. Mind NOT to hammer too hard on the aluminium casted part either (which holds the intake pipe and the preheating pipe together) to avoid cracking of the aluminium. The video shows how much debris came out of this one pipe.
So this way of 'desooting' is worth doing in my opinion, rather than making holes in the pipe which have to be closed by welding afterwards.
Once the hammering operation is finished you can respray the entire intake pipe assembly with zinc spray so that is becomes a genuine look.
After re-installing the intake pipe on the engine you will notice that the left hand and right hand side of the preheating pipe will have the same temperature after the engine has been running for about 4 to 5 minutes from cold (or even in less time) !
Good luck !!!!
Alfred - Belgium
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