Re: cleaning air filter on perkins 401-8
Jason, the proper maintenance for the intake mushroom and screen filter is to simply soak it in a container with some mineral spirits awhile and then give it a good scrub with a small brush--an old toothbrush will do. Run a pipe cleaner through the tube that the crankcase breather connects to and ensure that it's clean/clear. Then thoroughly dry the thing and give it a wipe with WD40 and your good to go.
Late to the game here, but thanks for the detailed instructions -- I just did this today.
The screen filter was less than porous before, and now I can see light through it. I'm sure that the engine will be much happier now.
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1984 Beneteau First 38 Kaimana