Eheim classic's pump head O-ring placement.

**JnanaJ** · 11th Dec 2013, 00:07

Hi guys, was wondering where should the placement of the O-ring be?

1) Before attaching the pump head to the main body, should the O-ring be at the top or bottom part of the area where the O-ring sits?

2) After connecting the pump head to the body, while using a strong light to see through the body, should the O-ring be located at the top or bottom part of the area where the O-ring sits?

Hope eheim experts can help, as mine was like some parts are at the upper side or lower side.

Thanks a lot.

**Jnomeo** · 13th Dec 2013, 04:34

hope this image help. 100_0530.jpg

**Sleepy_lancs** · 22nd Dec 2013, 12:39

Hi,

It should sit on the upper, usually on the upper just below the lip, basically the ring is to seal the water in so that the pump will not leak. Once closed up, you can test. As long as the water does not leak out. Its fine. Just keep it in a small basin for a few days to ensure there is no leaks. Hope this helps.

**JnanaJ** · 22nd Dec 2013, 13:31

Thanks Jnomeo and bro sleepy, water does not leak out from the canister, but there is always air inside my canister.
Even though there is nothing wrong with it, functioning well and no sound. But wherever I shake the canister, there will be air coming out from the output into the tank and the canister will go noisy for awhile before it becomes quite again. What could be the problem?

**qngwn** · 22nd Dec 2013, 13:57

Initially air not completely expelled. you can shake the canister to help the air to come out of the canister, or else you can leave it if it's not bothering you. it happens to me as well, and the air usually go away after a few hours/days as they dissolve into the water under pressure.

**JnanaJ** · 22nd Dec 2013, 14:31

Bro qngwn, mine is for weeks already, is like there is air being drawn into the canister from the inlet. But I have checked that all the quick-release and pipes are all connected very well and tight. The inlet pipe is also constantly under water and not near any air-stones.
My inlet pipe is place all the way down in the ious compartment where the return pump sits. The inlet pipe is one whole piece connecting to the quick-release...

**Sleepy_lancs** · 24th Dec 2013, 01:32

I think (purely guessing) the Magnet Impeller Kit is going to "die" soon this will happens to me once.

**paladin** · 30th Dec 2013, 17:19

This is common to all my eheim classics filters.
After filling the canister with water and you close the cover, there are still some allowance for air to be present.
What i did was to after closing the canister cover, i filled the remaining gaps with water through the outlet hose.
This should reduce the air bubbles inside.
After that, let the filter run and soon the air bubbles inside the canister will disappear.

Another method is to keep turning off / on the filter. The water will force the remaining air out of the filter with such actions.
But of course, this will cause the fitler to spoil.

**qngwn** · 30th Dec 2013, 17:36

Originally Posted by JnanaJ

Bro qngwn, mine is for weeks already, is like there is air being drawn into the canister from the inlet. But I have checked that all the quick-release and pipes are all connected very well and tight. The inlet pipe is also constantly under water and not near any air-stones.
My inlet pipe is place all the way down in the ious compartment where the return pump sits. The inlet pipe is one whole piece connecting to the quick-release...

There is an L-joiny connecting your hose to the inlet (bottom) of the canister. This L-joint can be turned 360 degrees like a screw. Connecting the L-joint and the canister is an o-ring.

Do check if the L-joint has been sufficiently tightened, and if the problem still happens, do check the o-ring to see if it is sitting in place, or worn out.

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