I changed tranny fluid (redline MT-90)
and was wondering why there are two plugs
on side of transmission?? One is slightly higher
than the other. I used the lower of the two to fill
transmission till it seeped out. Is this the correct
method or do you use the higher of the 2 plugs.
Haynes Manual only shows one fill plug.
88 AE
Transmission is shifting smoother
after about 100 kilometer run in. Amazing the difference
a change in fluid can make.
Rear end fluid is next.
Thanks in advance for any replies about the 2 plugs
Ace II

 

There are two plug, because there are two fill sections!&nbsp It sounds like you only filled one side???

You need to fill both sides.&nbsp How much fluid did you use?&nbsp It's supposed to take almost 3 quarts.



-Ted

 

Thanks for the info, I will check upper plug in the am.
I used about 2 1/2 quarts. Dam. Hope I didn't F_ _ _ anything up.
Only put about 75 miles since and it seems to be shifting better than before.
Maybe it will really improve when I get the other side of it filled. Thanks again for the info.
Ace II

 

The transmission is basically divided into 3 sections.&nbsp The front two contain most of the transmission gears.&nbsp The rear/last section is the transmission extension housing that houses the shifter and levers that connect to the shift forks in the other two sections.&nbsp There are small spaces at the top of the sections that allow fluid to slosh around into adjacent chambers - I bet some of of it sloshed into the empty side.&nbsp I doubt you damaged anything - if you did, you would've felt it by now.&nbsp Top of fluid on both sides just in case...



-Ted

 

Um, the top one is the fill hole, while the next one down is the inspection hole. This means that you are supposed to fill it through the top hole until the fluid gets to the next lower hole. What you did wasn't exactly correct, but it ended up with the correct result. If you fill it to the top hole, it will be over-filled.

OK Ted, no more crack pipe for you! However, it is correct that both drain plugs must be removed in order to drain the transmission properly due to the multiple sections.

BTW, for all the NA folks reading this, you only have one fill plug and one drain plug on your transmission, so you can disregard this thread.

 

Good thing I only make airplane parts!!
Doh! It all makes sense to me now.
Luckily no harm done. Tranny has never been this smooth. It is shifting like a
sweetie now.
2 more ounces of
Red-Line MT-90 added which made 2.6 quarts total.
Correct??
Wait till I start playing with the turbo on this puppy
Thanks to all responses. As always, another lesson learned by an apprentice Rotor Head.
THANKS
Ace II

 

Yes, the capacity is listed as 2.6 US quarts. This site has free online RX-7 manuals under the How-To's menu:
http://fc3s.org

Yes, Red Line works wonders in the gearbox. I also recommend Red Line gear oil for the differential. It's one of those few products that really workes as well as advertised. You may also want to look into the Fumoto F-106 oil drain valves, which are another good product IMO, especially if you are used to the aviation way of doing things. I have been using Red Line gear oil and the Fumoto valves in my RX-7's with fantastic results for over a dozen years now.
http://www.fumotovalve.com/

You make airplane parts? Ooh, you're my new buddy! Too bad I don't have an airplane (yet).