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ericnguyen 06-11-2003 01:09 AM

For 300SD owners: is my 1984 300SD missing some vacuum hoses?
1 Attachment(s)
Dear friends:

Please take a look at the attached image first.

On the top of my camshaft (valve) cover, there's a black plastic box which is connected to the throttle linkage assembly. On the front side of the black plastic box is some rubber connectors to which several vacuum hoses are attached. However, there are 5 holes but only 3 attached vacuum hoses.

My question: is my 300SD missing 2 vacuum hoses, or these 2 remaining holes (marked in the image) are not used at all? If it's actually missing 2 vacuum hoses, please take a picture of your 300SD engine compartment and tell me where the 2 missing hoses should be connected to.

Thank you very much.


billrok 06-11-2003 01:30 AM

Pull off the connector and look at the inside. You'll see that those holes have not been drilled out for accepting a hose. If you had those two hoses missing, you would have one heck of a vacuum leak me thinks.

Old Deis 06-11-2003 01:02 PM

That the way my 300SD looks. Have checked some others and they have same configuation.

Thomaspin 06-11-2003 01:40 PM

You are OK
Here's how it should look. Only 3 hoses. Consider replacing trhe plug - they leak with age and can mess up your shifting.

ericnguyen 06-17-2003 04:06 AM

Dear friends:

Thanks a lot for your information.

Thomaspin: I guess you are a scientist in the real life :-) Your technical presentations of car repair procedures are very clear, methodical, and to the point.

Some science history text books claimed that the Einstein was the best theoretical physicist but also the worst experimentalist (he would break things if he went to a laboratory). Ernest Rutherford was a complete opposite of Einstein (The famous Rutherford formula regarding alpha particle scattering was actually formulated by one of Rutherford's assistants, but the boss always took credit for everything :-). However, Enrico Fermi excelled in both theoretical and experimental physics.

Best regards,


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