MTD Air Filter Grease - What's it For?

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Today we'll be working on a Troy-Bilt TB30 rear engine riding lawn mower with a Powermore (built for MTD) 382cc engine, commonly referred to as the XP380S or T84 / T90 engine.

When you purchase the OEM (Original Equipment Manufacturer) MTD Air Filter part number 937-05129, you get a small packet of 350 silicone grease labeled part number 737-05131.

There are no instructions supplied with the air filter, nor is there any information regarding this packet of grease in the riding lawn mowers owners manual, or even in the official MTD engine service manual.

When searching the web for this 737-05131 part number, nothing comes up, as it's technically a "Not for Sale" item. This means you cannot purchase the grease separately, as it only comes shipped with this particular air filter.

Today I'll be discussing why they include this grease, as well as what you're supposed to do with it.

When looking at the air filters for the Powermore 420cc or 547cc engines, they do not come with this small package of grease.

My best guess is that MTD ran into a sealing issue with this particular air filter / air box assembly, and decided the best solution was to use a bit of grease to improve air flow through the filter itself.

By sealing the air filter to intake elbow connection, this increases the air flow through the paper filter, limiting the amount of fine debris entering the carburetor.

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Видео MTD Air Filter Grease - What's it For? канала Eliminator Performance