Grady22
Hello to all! Recently had a 16KW unit that I was commissioning. Unit was fueled by NG and had an Evolution controller. Started the unit and immediately it started surging and movement of the governor was very noticeable. Gas pressure was constant at 5" WC. Ohm checked the stepper (Governor) motor as it was within specs. Made sure fuel selector was on NG, which it was. Made sure NG was selected in the controller, which it was. Had 12.3 VAC on wire 18. Decided to call Generac for support. After telling him what was happening, he said to unclip the plastic cover on the air cleaner housing. Immediately the engine leveled out and stepper motor remained relatively steady. Generac stated that some of the filters were/are too restrictive. He asked me what the 3 figure code was on the air cleaner element. It was CB6, I think. Anyway, he suggested I replace it with a CB4 or CB5. Since I didn't have one, I just left the air cleaner cover lifted. I then placed the generator under load and it performed as designed. This particular filter was flame retardent treated. Have any other Technicians out there come across this same issue?
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MikeHubbard
while performing maintinace we found 1- 16kw and 2- 22kw's with same problem. called tect support said replace air filter. did not have filters with me at that time . i was able to correct 2 of them this way. with gen running [NO LOAD] turned fuel pin from nat to lp ran appox 5 sec turned back to nat these 2 units ran great during a 2 day power outage without replaceing the filters. after the outage we did replace the filters. on the 3nd one, turing the pin did not work we had to replace filter
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tunedis95
This needs to be made as a sticky. Going to check with local dealers on for these CB4 and CB5 filters. Thanks for sharing!!!
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cookelec
I have had (2) of these this month, one was brand new and one had just been serviced by another company. Both surged as you stated and I replaced the air filters on them with Generac filters and they still surged. I found a replacement at an auto parts store and they both worked fine after that. The only problem is the auto store filters do not have a fire retardent treatment. I have since discarded all the replacement filters I had in stock so they don't get installed. Hopefully Generac will sort this out.
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Birken Vogt
What was the replacement PN
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cookelec
The filter I used was a WIX 49225. If this is not allowed to be posted, please remove.
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tunedis95
cookelec;42138 wrote:
The filter I used was a WIX 49225. If this is not allowed to be posted, please remove.


You're the man. Ordered and THANKS!

I was going to order another Generac filter, but didn't feel like spending money till someone finally sends me the right one. I can only imagine the man hours spent by many techs troubleshooting this issue which could potentially just be the air filter.
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Hodgy
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Was wondering why the air filter would need to be treated with a flame retardant ?
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UPS
Hodgy;42144 wrote:
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Was wondering why the air filter would need to be treated with a flame retardant ?


Probably concern that a backfire could set the filter on fire, which might be a bigger risk in a location where flammable dust might have been pulled into the filter.
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John R
Does Wix make a filter for the 20KW with a 999cc engine.
It seems to be taller than the filter on the 990cc engine.
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cookelec
If we're talking the same filter, I have used a Wix WA10094 to replace an 0G5894. I always try to use Generac parts, but this new filter problem with the retardant spray is really frustrating. I have tossed 9 filters so they don't get used.
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Hodgy
UPS;42146 wrote:
Probably concern that a backfire could set the filter on fire, which might be a bigger risk in a location where flammable dust might have been pulled into the filter.



So what about the other 6 engines I have around the place with air filters, are they left unprotected because the filter has not been treated ?

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DanS26
I have never seen an air filter bursting into flames due to a backfire. Is this common?

Did Generac provide a solution for a problem that does not exist?

Inquiring minds want to know.......
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Birken Vogt
I once worked on a Kohler 10RY with the Ford 1.1/1.3 Kent engine that had some serious problems and was mightily backfiring through the carb whenever you went to start it.

It has a flat panel air filter much like the 11 kW.

That filter had a big hole burned through it where the tube went down to the carburetor but no evidence of continued flamage anywhere around the hole.
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John R
Found the Wix replacement, was wondering what I was going to use at maintenance time, now I have the Wix on hand.
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UPS
Hodgy;42152 wrote:
So what about the other 6 engines I have around the place with air filters, are they left unprotected because the filter has not been treated ?

.


There's not much risk really, but I was thinking mainly of what may be Generac's point of view - a new concern for things possibly flammable. Various products are catching on fire lately...
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cookelec
I always use Generac parts when available especially if the unit is still under warranty. I would guess the flame retardant treatment may have something to do with the rating of the generator as far as placement in proximity to other structures. When I recently used the Wix filter, I notified tech support of the repair.
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tunedis95
My lexus GS430, 8.75hp Toro briggs push mower, 26hp SCAG zero turn, or my Stihl km110R have never had an issue with changing out their filters to a different brand and such, so i'm sure switching to this WIX automobile filter wont either. Other than filters, I always try to keep everything else OEM.
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dennis48755
What would be the correct air filter part number for my 6462?

The owners manual lists 0J8478, however I get no search results from Generac, Ziller Store or the Wix (cross reference) websites for this part number.

Dennis
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Namvet34
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Dennis,

Remove the air filter currently installed in your generator and see if there is a part number printed on filter.

Regards,

Gene

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dennis48755
Duh! What a good and simple idea Gene. Thanks.

Installed (from factory) filter is marked...
GENERAC 0J8478
FLAME RETARDANT
MADE IN INDIA CB5 12826V

At least it's not a CB6

Guess I'm out of luck with Wix, hopefully Generac gets the problems resolved before I need a replacement.
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BrentB
dennis48755;42177 wrote:
Duh! What a good and simple idea Gene. Thanks.

Installed (from factory) filter is marked...
GENERAC 0J8478
FLAME RETARDANT
MADE IN INDIA CB5 12826V

At least it's not a CB6

Guess I'm out of luck with Wix, hopefully Generac gets the problems resolved before I need a replacement.


NAPA PRO SELECT #29225 works and fits good.
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dennis48755
Thanks for the tip Brent.

Dennis
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enochian
Does anyone have a replacement for 0E9371A?
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