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-   General Q & A (https://www.offshoreonly.com/forums/general-q-20/)
-   -   CMI Air Actuated Mufflers (https://www.offshoreonly.com/forums/general-q/359211-cmi-air-actuated-mufflers.html)

Alwhite00 03-01-2019 02:51 PM
Anyone have these? Quick question. When the boat is off and you close the flapper how long does the flapper stay closed. I’m bench testing mine and it only stays closed a few seconds after closing them if the compressor is shut off. I didn’t know if the engine was running if that would help them stay closed.

Scarab28 03-01-2019 04:07 PM
That's an indication of a leaking cylinder or leaking hose connection. Run some soapy water over each connection as you run the pump. You'll easily find the leak. They should remain closed overnight.

Alwhite00 03-01-2019 05:36 PM
I believe my solenoid is bad, just ordered another one. I’ll keep everyone posted.

Rookie 03-01-2019 06:07 PM
Originally Posted by Alwhite00 (Post 4675067)
Anyone have these? Quick question. When the boat is off and you close the flapper how long does the flapper stay closed. I’m bench testing mine and it only stays closed a few seconds after closing them if the compressor is shut off. I didn’t know if the engine was running if that would help them stay closed.
Originally mine would stay shut for days in storage.
Originally Posted by Alwhite00 (Post 4675106)
I believe my solenoid is bed, just ordered another one. I’ll keep everyone posted.
I put a check valve inline so the air did not bleed back through the pump.

Griff 03-01-2019 09:44 PM
Originally Posted by Alwhite00 (Post 4675067)
Anyone have these? Quick question. When the boat is off and you close the flapper how long does the flapper stay closed. I’m bench testing mine and it only stays closed a few seconds after closing them if the compressor is shut off. I didn’t know if the engine was running if that would help them stay closed.
Mine will stay closed for about an hour.
FYI, the ends on the actuator cylinders will unscrew and there are O rings inside that can be replaced.

Alwhite00 03-02-2019 05:23 AM
Originally Posted by Griff (Post 4675133)
Mine will stay closed for about an hour.
FYI, the ends on the actuator cylinders will unscrew and there are O rings inside that can be replaced.
i had to replace my cylinders as both were cracked next to the fitting. It is really thin in that spot, bad design. I replaced them with Bimbas, 1/3 the price and all stainless/aluminum construction. Work great. My solenoid was leaking.

Rookie 03-03-2019 07:09 PM
Originally Posted by Alwhite00 (Post 4675148)
I replaced them with Bimbas, 1/3 the price and all stainless/aluminum construction. Work great. My solenoid was leaking.
Part number? I'm to lazy to go measure my cylinders. I assume the cylinders were spring return.

Alwhite00 03-03-2019 10:04 PM
Originally Posted by Rookie (Post 4675331)
Part number? I'm to lazy to go measure my cylinders. I assume the cylinders were spring return.
yes, spring return. I’ll get the part numbers tomorrow.

Alwhite00 03-04-2019 07:00 AM
https://cimg3.ibsrv.net/gimg/www.off...6c7ea24b66.jpg
You need to take the pin out of the end. (Tap out with hammer ) and these do not have a line from the vent. This did not matter to me as its a new install.


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