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how to locate a leak in air intake system

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flash42:
took out as much of the air intake system as i could, and sealed it up with silicone.
but the engine still wont cut out.
covered the snorkel top and listened for leaks, and it sounds like its comin from the plastic piece that attaches directly to the wing. its such a mission to get off and on again :(, anyone know of the best way of going about it?

thermidorthelobster:
Magazine over the snorkel intake is best if it's flat faced - plastic bag may get sucked in or shredded.  Hand is not a good idea, not after the first time anyway!

Bear in mind that by blocking the snorkel intake, you are forcing the engine to collapse the pipes, which at joints will un-seal perfectly good seals.  At normal atmospheric pressure they may be perfectly good.

I sealed my old 200tdi as best I could and it still wouldn't stall.  Then I accidentally drove it fully underwater (waterline half way up the windscreen) for several minutes, so the engine was running totally immersed for quite a while.  Didn't skip a beat, so the seals must have been just fine, even though they leaked under suction.

J.D.:

--- Quote from: flash42 on October 31, 2008, 16:28:15 ---took out as much of the air intake system as i could, and sealed it up with silicone.
but the engine still wont cut out.
covered the snorkel top and listened for leaks, and it sounds like its comin from the plastic piece that attaches directly to the wing. its such a mission to get off and on again :(, anyone know of the best way of going about it?

--- End quote ---

A good quality sealant such as Tiger seal mate.

flash42:
removed the pipe that connects to the vent cover, and covered with a magazine, engine promptly stalled.
so its definately the joint between these two sections.
been recomended a product called "sticks like ****" so will have to go and get some tomorrow, the joint is just to losse to be done with normal silicone sealent.

L90OOK:

--- Quote from: thermidorthelobster on October 31, 2008, 16:43:59 ---Magazine over the snorkel intake is best if it's flat faced - plastic bag may get sucked in or shredded.  Hand is not a good idea, not after the first time anyway!

Bear in mind that by blocking the snorkel intake, you are forcing the engine to collapse the pipes, which at joints will un-seal perfectly good seals.  At normal atmospheric pressure they may be perfectly good.

I sealed my old 200tdi as best I could and it still wouldn't stall.  Then I accidentally drove it fully underwater (waterline half way up the windscreen) for several minutes, so the engine was running totally immersed for quite a while.  Didn't skip a beat, so the seals must have been just fine, even though they leaked under suction.

--- End quote ---
I'll second that...I was there  :shock:
Use Sikkaflex silicone adhesive...sticks very well.
Of course you could use a snorkel like the Southdown product, not far from you at Zeal Monochrome,  that does away with the crappy plastic wing moulding

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