I put my stock intake back in my '85 today because I will be doing a lot of hwy driving in the near future and I would like the quieter ride. I got new rubber mounts for it, but when I start the engine (which is running relatively smooth after valves and timing) the intake is vibrating violently at idle. I will be surprised if the mounts last more than a week. Is this normal?

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My Primary Driver - '85 300CD - 4-speed conversion, 2.47 rear, lowered, euro headlights, rebuilding (not restoring so much)

Wife's - '08 Saab Sportcombi Aero

Riding a '03 Yamaha Warrior

I guess you're talking about the air filter housing? Check the bracket that the three mounts attach to - mine was broken that seems to be a common problem.

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Charles
1983 300D, bought new, 215k+ miles, donated to Purple Hearts veterans charity but I have parts for sale: http://www.peachparts.com/shopforum/mercedes-benz-cars-sale/296386-fs-1-owner-83-mb-300d-turbo-rebuild-parts.html

Yes, broken bracket.

Place a piece of rubber radiator hose between the filter housing and valve cover.

My mount was cracked too this morning before install. I welded it up and checked all the bolts. It was solid prior to install. I will check it again in the morning then.

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My Primary Driver - '85 300CD - 4-speed conversion, 2.47 rear, lowered, euro headlights, rebuilding (not restoring so much)

Wife's - '08 Saab Sportcombi Aero

Riding a '03 Yamaha Warrior