simple fix for air cleaner bracket (pic)
in my expiierence it either breaks here, where the rubber mount nearest the firewall connects to the air cleaner bracket (ive had two different cars with the same failure) or where the bracket is welded together. This fixes the first failure i described.
Basicaly cut a piece of metal, mark where to drill a hole, drill it, run the bolt that bolts the bracket to the manifold through and hand tighten it. Then put the air cleaner back on loosley so that the other two mounts protrude through the bottom of the air cleaner. this will line everything up. then take a pencil and stick it throough the remaining hole and mark onto your new piece of metal so you know exactly where to drill a 7/32" size hole to screw your rubber mount into. if you use that size drill ad your piece of metal is mild steel you should be able to thread the rubber mount into the hole just like the other holes. after your rubber mount hole is drilled and you bolt your piece back in use loctite or it WILL loosen quickly from the incessant vibration.
Enjoy
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 1981 300SD 512k OM603
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