i have this hole under the transmission towards the front by the oil pan, looks like there seems to have been some plug or something there but - i cant' find it in the parts catalog and dont' know what belongs here.. can you let me know if this is just some regular rubber or plastic plug?? or am i missing something important here?

transplugmissing2_zps9e588a25.jpg Photo by itr78 | Photobucket


thanks all
84GSL

 

WTF??? I just did my clutch today and im pretty shure mine doesn't have that. I think maybe s4 trannys have that hole not sure why.. a peek hole or vent maybe? Idk

 

Thats a rubber plug hole. Just double checked under my 3rd series 1st gen car

 

Thanks guys. I'm glad it's just for a rubber plug. If anyone happens to come up with a part number please let me know. Meantime ill measure the dimensions and try to find some universal plug of something.

 

N201-16-145 is NLA

 

Does anyone have a source for this plug and the one that's on the edge of the Bell Housing?

 

your tranny will survive without them

 

You're probably right Siraniko ... however it annoyed me. I found and bought a 1" X 1-1/8" "Rubber Expansion Plug" made by Doorman from one of the Big Box Auto Stores. The 1-1/8" was too deep [it would have hit the ring gear] so: 1. I took it apart. 2. Cut 1/4" off the end with the ROUND hole. 3. Reassembled and then cut the excess threads off. 4. Inserted it into the hole, it's a nice snug fit. 5. Put on thread lock and tightened down the nut. Works great, but do double check clearance to the ring gear. The small one half way up the trans, I will take your advice and ignore. Thanks!

 

Inspection hole.

The plug is always missing. At most I've duct taped it but mostly just leave it. Water splashes up there but meh.

 

I just recently teared a little cut on mines. There isnt any oil leaks what so ever ive been wondering what it was too.

 

I suspect it's there to allow inspection of the Ring Gear.

 

correct, that rubber plug is an inspection plug. you should replace it as it can allow moisture and road grime into the bellhousing.

it wouldn't be a bad idea to post a want to buy ad in the first gen parts for sale/wanted section

 

Worse thing that could happen is gravel will bounce up in there and damage your clutch. It's a one in a million chance though. Or a mouse could get in and poop!

 

After spending hours looking for this plug online, I made a cover out of 1/8" 6061.

 

you do realize this thread is 13 yrs old and OP last log in was in 2017.

 

All true but it helped me. I had no idea that inspection hole was there.

 

Look for this title:
Mazda Rx7 1986-1991 FC3S Transmission Inspection Plug Cover Grommet 13b
On the auction site. I am not affiliated at all.
Though it says for fc it fit for my Gslse. Maybe someone could confirm same hole size for the 12a's

 

What auction site?

 

Ebay. Sorry for not writing it, I just don't like advertising for that place

 

Is this the plug in question?

 

Yes Sir, it does appear to be the correct one