I had an 'air leak in' once that drove me nuts finding it. It was right where the clear inlet fuel line is installed at the factor onto the banjo bolt fitting. So air was getting in there, but no chance to see bubbles in the clear line. That one took a while I must say. The symptom was 'hard starting cold.' I have never found air getting in at the small return lines myself. I have one pump that runs pretty well, but it also leaks pretty nicely. that one leaks mainly at the main shaft. Scott
----- Original Message ----- From: Poppie Jagersand To: vanagon@GERRY.VANAGON.COM ; Poppie Jagersand ; Diesel-Vanagon@yahoogroups.com Sent: Sunday, June 12, 2011 10:18 PM Subject: [Diesel-Vanagon] Re: Debugging air leaks in a Diesel
Update on the slow progress on getting the Westy road ready. Our vacation got delayed a month so I have not been working on it at the speed I should have. Put in another afternoon in the debugging this Sunday. Looks like the unfortunate news is that the injection pump itself has a very small air leak. I have replaced all the rubber hoses for the injector return lines (the usual suspects). Then I disconnected the fuel; in and return lines on the pump and connected two new hoses that I ran directly from a jerry can of Diesel fuel. When starting the pump would first purge the air, so pushed big air bubbles through the return line. However, even after some minutes of running, small air bubbles would remain. I'm not sure how long it takes for the air to be completely purged, but it looked to me as if there was a continuing and not diminishing amount of small bubbles. So I'm running out of "easy" things to change. I guess I can change the copper washers on the input and output fuel fittings on the pump. If that doesn't help what else can I try short of removing the pump and replacing seals? I'm thinking since the bubbles continue when running, the leak should before the vane transfer pump. I'm not sure what shafts seals should be most suspect, but the input shaft might be one. Let me know what you think and if there is anything else I should test. I tried Gnarlie's oil squirting trick on the inlet fittings. Wasn't sure how to get motor oil to the input seal without risking splattering one the timing belt, so didn't do that. (Bad idea since backside of timing belt drives the intermediate shaft, and oil on the belt can make it slip. b.t.d.t. on my previous B2 Passat TD) |
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