Aftermarket air filter assembly for Onan MDKD

[fissioneng]

I have an 8 KW MDKD and need to replace the air intake assembly. The Onan part is not only expensive, but poorly designed. I am looking for something like a really small version of the Racor air filter (their smallest is 800 cfm) that I can just plumb to the intake with a piece of hose. Has anyone done this or know of a manufacturer for something like this. It only needs to handle about 200 CFM.

 

[doc g]

Racor makes small airseps . K and N airfilters also would be a source . They have all sorts of generic airfilters that you could adapt............Pat

 

[fissioneng]

Okay, I will look into that.

I also made a mistake, the 200 cfm includes cooling air moved by the fan. I am guessing this little engine only needs 30 cfm or so.

 

[stormchaser]

Could you adapt a standard K&N cone filter? Like the ones for a car:

They can be had pretty cheap...

 

[fissioneng]

Yes, I am thinking about that. What I would really like is something as shown in this picture, a canister type unit. I am trying to call this company to see where they source these. I haven't found them at Racor yet.

 

[LUV'N LIFE]

Jeff, search donaldson filters. They market a large inventory of filters (canisters) for industrial,tractors,etc.

 

[fissioneng]

Thanks, I bought a Donaldson G042545. Supposedly it will make the generator quieter too!

 

[34Hatt]

Thanks, I bought a Donaldson G042545. Supposedly it will make the generator quieter too!

Let me know if that works I can't see how your going to hear the difference. I have the same one pretty noisey with out a cover. I think a lot of the noise is from the governor on them it has precision balls that spin around and that seems to make a lot of the noise. Well at least on mine it does do you find the same thing??

 

[fissioneng]

Let me know if that works I can't see how your going to hear the difference. I have the same one pretty noisey with out a cover. I think a lot of the noise is from the governor on them it has precision balls that spin around and that seems to make a lot of the noise. Well at least on mine it does do you find the same thing??

The guy at Southeastern Power (Phasor Generators like in the photo) told me I would hear a big difference with this filter. I have an enclosure, so it might not make as big a difference. Phasors are all powered with Kubota diesels and he installs this filter on the smaller ones.

The plastic air baffle rattles a lot on mine since one of the mounting tabs is broken. I have been doing a lot of maintenance on it lately and it seems to me there is quite a bit of intake noise. I have not noticed the ball bearing sound coming from the governor. I will put my ear closer to that next time.

I'll let you know how it works out.

 

[Timm]

Just as an FYI - Walker Engineering makes an Airsep Kit for that genset. The AIRSEP works just like it's bigger cousins to contain the blowby from a diesel engine.

These kits can be purchased from your local West Marine. Probably won't have it on the shelf but it can be ordered and will come in on the stores next truck. WM SKU is: 7777071 Retail price is: $500

 

[Trojan]

Let me know if that works I can't see how your going to hear the difference. I have the same one pretty noisey with out a cover. I think a lot of the noise is from the governor on them it has precision balls that spin around and that seems to make a lot of the noise. Well at least on mine it does do you find the same thing??

I don't think your hearing any noise from the governor balls they don't spin. They just provide movement for the governor squash plate. There locked in a aluminum channel and move very little and quite slow.
I don't even have a filter on my Onan just a flame arrester. I have a sound shield. Without a sound I would think the air filter would help lower noise. But how do you work around the flame arrester using a hose and a filter?

BILL

 

[fissioneng]

I don't even have a filter on my Onan just a flame arrester. I have a sound shield. Without a sound I would think the air filter would help lower noise. But how do you work around the flame arrester using a hose and a filter?

Well, I don't have a flame arrestor or filter right now and I don't see one in my Onan parts book. There is what's called the "air silencer", this attachs to the intake manifold. There is a hose that comes from under the control box that feeds this silencer box. I plan to take the silencer off and attach a hose to the intake manifold and air filter like shown in the photo.

 

[fissioneng]

Just as an FYI - Walker Engineering makes an Airsep Kit for that genset. The AIRSEP works just like it's bigger cousins to contain the blowby from a diesel engine.

Probably won't have it on the shelf but it can be ordered and will come in on the stores next truck. WM SKU is: 7777071 Retail price is: $500

Yikes, this Donaldson filter is a tenth of that, $50. I was just going to route the breather hose into this filter.