Honda trx300 oil filter replacement - Honda ATV Forum
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post #1 of 15 (permalink) Old 10-12-2011, 06:37 PM Thread Starter
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Honda trx300 oil filter replacement

I took oil filter cover off and when it popped off, cover went one way the oil filter went another and the spring went another. I looked through service manual and can't tell how the oil filter goes back in. One side of the filter has a rubber grommet in it, the other side has a small hole with inner lid spring loaded.

The drawing in the service manual shows 2 O rings, 1 large one for the cover and a little one.
The replacement filter only came with the large one.
If the old little one was there I can't find it. I was in the middle of garage, I just don't think it had a little o ring on it. I searched all over for the little one.

I have to think according to service manual that the rubber grommet side of the filter goes against the cover, with the grommet fitting around the little pipe thing on the cover. The spring goes against the 'crankcase' and the filter side with spring loaded 'lid valve' goes against it. I think the spring loaded 'lid/valve' is in case the filter gets stopped up so as to allow the oil to have an emergency bypass. Dagone this is hard to explain. I hope any answers will be better explained than what I put.
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post #2 of 15 (permalink) Old 10-12-2011, 06:46 PM
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does the filter not say "out" or "outside" on it ?
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post #3 of 15 (permalink) Old 10-12-2011, 06:54 PM
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if it is like my 250 and it sounds the same the rubber grommet goes out and the smaller hole goes against the spring
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post #4 of 15 (permalink) Old 10-12-2011, 06:57 PM
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Yeah, the rubber grommet faces outside toward the cover and the spring goes behind the filter against the crankcase.

Most 4-wheeler problems are caused by a loose nut connecting the handlebars and the seat!!

You only need two tools in life -- WD-40 and duct tape. If it doesn't move and should, use the WD-40. If it shouldn't move and does, use the duct tape.
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post #5 of 15 (permalink) Old 10-12-2011, 07:01 PM
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Look at the illustration below. I put a red arrow where the small o-ring is supposed to go. By the way, you probably don't need to change the small o-ring, but just make sure it's not missing or damaged. I never replace the small o-ring or the large o-ring unless they're damaged.

Click the image to open in full size.

Most 4-wheeler problems are caused by a loose nut connecting the handlebars and the seat!!

You only need two tools in life -- WD-40 and duct tape. If it doesn't move and should, use the WD-40. If it shouldn't move and does, use the duct tape.
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post #6 of 15 (permalink) Old 10-12-2011, 07:04 PM
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Welcome to the Forums!!! It goes the way Helmut said.

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post #7 of 15 (permalink) Old 10-12-2011, 07:15 PM
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Welcome to the forums.

Most 4-wheeler problems are caused by a loose nut connecting the handlebars and the seat!!

You only need two tools in life -- WD-40 and duct tape. If it doesn't move and should, use the WD-40. If it shouldn't move and does, use the duct tape.
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post #8 of 15 (permalink) Old 10-12-2011, 07:21 PM
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DO NOT install it backwards! Welcome to the forums from OK

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post #9 of 15 (permalink) Old 10-12-2011, 11:49 PM
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yep..helmut has ya covered..the seal you see on the filter faces out towards the cover....if you look at the cover..you will see what i call the cover nipple in the middle of the cover ???..this goes into the seal in the center of the oil filter..the the spring goes behind the filter..and i'm with helmut on that tiny o-ring..i hardley ever replace that o-ring. while you got the cover off..check out that big o-ring that goes around the cover's ring...if it's bad..replace that o-ring !!..or it will leak oil !.

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post #10 of 15 (permalink) Old 10-13-2011, 04:50 PM Thread Starter
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Concerning the little O ring, either lost it (don't think so) or was never there. Wouldn't the new filter have the little o ring, if not I would guess I would have to go to a dealer to get it??????
Thanks all
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