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Rebuilding an Obsolete Air Cleaner

pancholasvegas

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Joined
Nov 6, 2017
Messages
253
Happy Holiday Season All!

Wanted to share a project that I completed over the last few days during some cold weather and downtime.

Been working on an antique scooter (1950’s Cushman) and got to the finish line a while back, save for the airfilter. Have purchased several that were claimed to fit, along with adapters, but nothing worked. Didn’t desire to run a “Pod,” style filter on the machine either, as everything is still setup factory as far as the rest of the bike / rig.

Ended up stumbling along the correct assembly a couple months ago at a swap meet, but had to purchase the carb and intake assembly. Whatever, seller was nice enough to let me run home with it and check fitment prior to purchase so no complaints.

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The entire assembly was in sorry shape, but complete. Unfortunately, these old oil bath air cleaners are not meant to have the media replaced, and I certainly didn’t trust it anywhere near the engine. After the media is placed in the air cleaner assembly, it is crimped shut all the way around.

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So with some downtime over the holidays, I set to getting this in shape for mounting on the bike. I started by modifying a small flathead screwdriver and using that with a small hammer to begin getting underneath the factory crimp. Not too far, and not prying much, but enough to relieve the crimp. All the way around. Then used some small pliers and began tilting the crimp backwards.

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Eventually, the crimp was loosened enough to remove the front plate.

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The media was then removed, along with the back screen.

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Cleaned off the paint from the front and rear screen. I also deep cleaned the assembly housing. I didn’t manage to get photos, but it was at this point that I replaced the filter media with new material from a modern motorcycle filter. At this stage, the screens and interior of the assembly were prepped and painted.
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The pinching plier tool you see on the right is a homemade slide-hammer I got from a friend, I used this to grab the stud that was rust-frozen in the air cleaner and remove it. At this point, the media was reinstalled, and we began the crimping process.
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I used a variety of different punches, pliers, visejaws, etc. to crimp the perimeter of the assembly.

I was then able to paint the exterior body and the front screen. The body was carefully masked and painted, the screen took some more creativity and a very fine brush.
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Running out of space, so I’ll finish in the following post.
 
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pancholasvegas

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Nov 6, 2017
Messages
253
Now that the assembly was complete, I was able to fit it into the engine bay.
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Had to get some new studs from the hardware store, these photos are from the mockup stage before cutting to length, but I’ll have that done by the end of the day.

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And some photos of the machine wearing it.

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Thanks for checking it out! Yes, I thought about modifying for ease of disassembly, but this machine is never out for long, and is more of a car show/neighborhood ride than anything that racks up the miles.
 

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pancholasvegas

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Nov 6, 2017
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what purpose did having the Q-tip pieces underneath serve?
I used those to push down the mesh filter to get from getting paint on it when applied with a brush. They were soft enough to not damage the air filter, but small enough shims that I didn’t worry about compressing the filter too much as it isn’t designed to be squished tight.
 
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pancholasvegas

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Nov 6, 2017
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253
Why didn't you straighten the front grill while it was off?
Good question - In the photos, it looks like it’s looking around the corner, in real life application, it’s not that bad. Also, the fit for the front screen is extremely tight, and I’m sure the initial crimp resulted in some of the flex. Once I removed it and saw how thin the material was, I was concerned about stretching the metal too far getting it straight again, along with the fit into the assembly once stretched. The material for the front grill was thin from the factory, and thinner yet at this point from corrosion and the initial factory crimp.

The upper flange that is crimped around the screen is very thin as well, even more now after removal. I was very careful when re-crimping so as not to tear the metal, and fighting the tight tolerances (tighter yet had the screen been straightened) and not damaging the metal required working slowly and carefully. Not to mention, you don’t see it when you’re riding it ;)
 
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