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Old 02-04-2002, 03:45 AM
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exhaust system

Hello everyone. I am pulling the motor out of my 86 300E and I noticed inside the "mini cat looking cans" that are bolted to the exhaust manifolds are almost completely clogged with carbon. Is that what they are........."pre-catalytic converters" before the exhaust gases flow to the catalytic converter? It seems to me that if they were causing increased back pressure, this is what could have caused the engine to grenade. The number 2 piston was completely gone. When I removed the head............nothing but a wrist pin/connecting rod staring back at me. Is there some way to salvage these or should I just buy a whole new pipe with converter. Who and where is the best price for this? Thanks!

Frank951, '86 300E
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Old 02-04-2002, 10:24 PM
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Join Date: Mar 1999
Location: Suwanee, GA, USA
Posts: 4,712
They took these out on the newer 103 installs. I'd knock out the brick and let it fly.
Donnie Drummonds
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Old 02-05-2002, 07:02 PM
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Join Date: Sep 2001
Location: Austin, Tx
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Do you know what year they took the pre-cats out? I can't exactly fit my head underneath my car to have a looksy... (I would assume my car has them out, since it was the last year for the m103)
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Old 02-06-2002, 02:37 AM
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I don't know the year that they stopped installing them. Just open your hood and look at your exhaust manifolds, these "pre-cat cans" that I am refering to are bolted directly after the outlets of the cast iron manifolds. They are almost the size of coffee cans, about 4" in diameter, so there is no mistaken if you have them or not. I hope this helps out!
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