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3-Series (E21, E30) Chat relating to the BMW 3-Series from 1975-1983 and 1984-1991 line. Specific models: BMW 315, BMW 316, BMW 318, BMW 318i, BMW 320/4, BMW 320i, BMW 320/6, BMW 323i, BMW 320i. E30 Family models include: BMW 325e, BMW 325i, BMW 325is, BMW 325ix.

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Old 03-14-2005, 04:14 PM   #1 (permalink)
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is there an easy way of getting at the bolts on the intake manifold? I can't figure out how to reach them with any normal tool. The car is a 325e.
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Old 03-14-2005, 05:13 PM   #2 (permalink)
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they're a pain in the ass. you just have to get a little wrench and be very patient. Why are you taking your intake off?
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Old 03-14-2005, 07:02 PM   #3 (permalink)
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A ratchet with an extension and a universal joint.
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Old 03-14-2005, 09:02 PM   #4 (permalink)
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I'm takin off the intake because I'm taking the head off. Although is it possible to just remove the head with the intake still attached?
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Old 03-15-2005, 05:30 PM   #5 (permalink)
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i removed the head on sunday and it is easier to actually take it off with the intake still bolted on, then it is a matter of 2 minutes to take the intake off the head!
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Old 03-15-2005, 06:31 PM   #6 (permalink)
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yes! you will save your self alot of aggravation if you just take it off together
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Old 03-16-2005, 08:18 AM   #7 (permalink)
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Too late. Thanks but I spent about 4 hours yesterday taking off the intake. It was fun I guess. Does anyone know what that spring loaded tube between the intake and the crankcase is for?
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Old 03-16-2005, 04:56 PM   #8 (permalink)
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Yes, removing the intake in a 6 cylinder BMW is a pain in the ass (or so my dad, the 325 owner) has told me.
The spring loaded tube must be (I haven't seen my father's engine though, but every car engine has one somewhere) the PCV valve, which is a one-way valve (that's why it's equipped with a spring loaded plunger) that relieves pressure from inside the crankcase to the intake manifold. It happens that no matter how good your compression is, some gas escapes through the piston rings to the crankcase and starts building up pressure inside. The PCV valve relieves that pressure, and the spring loaded plunger avoids intake air going into the crankcase.
Another job of the PCV is to reduce moisture inside the crankcase. The combustion gases are rich in water vapour which would contaminate the oil if not vented through the PCV (which by the way means Positive Cranckase Ventilation)
Hope it is of help.
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