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#1
11-09-2007, 11:30 AM
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How does a vacuum pump work?
I took my 1967 200D for a emissions test yesterday and it failed. For some reason the State of Arizona requires diesels to be tested even though California does not. I did notice that my car was smoking a lot because I watched from the outside of the car when the test was being done.
The car has been running good and I was puzzled as to what could be causing it to smoke. There are not too many possibilities here. I took the car home and added some injector cleaner in the fuel tank. I also changed the oil in the air clean container. I noticed as I was putting the cannister top back, that the gasket was missing. I figured that this is the reason the car failed the inspection. I changed out the shocks earlier in the year and removed the oil bath cleaner to get the shocks removed and that is when I probably lost the gasket. Now I need to find a new gasket because I can find the old one. I figured the gasket came off and fell down in the engine and I didn't notice it. Is this the probable cause of the excess smoke? I was looking at the vacuum pump to find out if there was any vacuum to the air cleaner. I notice that there are two tubes coming off the vacuum pump. One goes to the brake pod and it has the proper vacuum in it. The tube that goes to the air cleaner element did not appear to have an suction at the vacuum pump and am not sure this is normal. There was suction from the top of the manifold. I am confused as to what the purpose is of the line running from the vacuum pump to air cleaner element. I just want to make sure that the vacuum pump is operating correctly. Does anybody know what the procedure is for testing the vacuum pump on my car? 
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#2
11-09-2007, 12:20 PM
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If the brakes work then the vacuum pump is working. The line from the intake should be the supply/exhaust line (you've got to have something to provide an equalizing force or counter-force in any pumping action).
The oil bath shouldn't have any effect unless it is overfull. I thought '67 was the "cut-off" year for emissions.
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#3
11-09-2007, 01:16 PM
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If the engine is smoking, the injection pump needs to be 'timed' using an overflow tube. When properly installed on the IP, the engine is rotated manually and the IP set. Ask over on some of the Diesel forums. Those guys will know.
The vacuum pump is used for the brake booster becasue Diesels don't have any vacuum.
__________________
Regards Warren Currently 1965 220Sb, 2002 FORD Crown Vic Police Interceptor Had 1965 220SEb, 1967 230S, 280SE 4.5, 300SE (W126), 420SEL ENTER > = (HP RPN) Not part of the in-crowd since 1952.
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