Gear box plug

[CASwede]

I took apart my speedometer gear box unit to see if I could find the cause of my broken speedometer. The cable moves just fine at the gearbox housing, but sticks at the speedometer itself. I'm guessing I need a new speedometer. However, I'm quite happy with my bike speedo since it gives me quite a bit of info that the speedometer wouldn't.

After replacing the angled gear, I now get about four or five drops of oil a day out of the gear box. I have since found this is more than common. As mentioned, I don't have much interest in using my speedometer and wondered if others have simply removed the cable and plugged the hole for the gear box. Any thoughts on plug size? I guess I could just grab the gear and head to the parts store/hardware store and find a plug with the same thread. Blatchat mentioned a blank that some have installed, but no mention of source.

[GWise]

Here's a $60 plug that will also function as an electronic speedometer should you decide to convert: http://www.ebay.com/itm/Electronic-S...item232ab847aa

My other question would be - why is the angled driving leaking after replacement? Did you pull out the speedo cable?

[Doug Liedblad]

I don't recall there being a threaded plug. The sender / gear drive is held in by a circlip.

I can send a T9 manual in pdf format to you if interested.


Doug

[CASwede]

I just slipped under the car again to take a look. Now I see the connection with the circlip. Doesn't appear there is really any way to plug that hole.

The oil drips seem to indicate a leak at the point I've circled in red, inside the female connector. I had loosened the connection in this photo, but I also found it was a little loose under the car just now. Tightened it up best I can w/out pulling the circlip. I'll see if that stops it.

IMG_1916.jpg

[CASwede]

I don't recall there being a threaded plug. The sender / gear drive is held in by a circlip.

I can send a T9 manual in pdf format to you if interested.


Doug

Many thanks for the offer. I found the T9 manual online last night while researching gear boxes. Some interesting options.

[slomove]

Interesting feature. My T9 never had that speedo cable installed (the inductive speedo pickup senses the bolts heads of the diff flange) but when I had the gearbox out I did not pay attention to this hole, if and how it is plugged. Maybe that has to do with my drooling gearbox....

[Doug Liedblad]

I don't think the circlip holds it in very tight, mine moves a bit.

I have a T9 out of the car if you need a measurement of the hole.

[CASwede]

I don't think the circlip holds it in very tight, mine moves a bit.

I have a T9 out of the car if you need a measurement of the hole.

Does the gearbox hole have any threads to fill? Or is it just blocked by a seal? If it's just a seal, I've already heard the replacement seals are not so good.

I could just fill up the gear box every few months through the hole on the port side. If my friends ask why, I'll just tell them the gearbox is Ford, but the speedo gear is English. Nobody would question that.

I do like the potential of GWise's suggestion regarding a whole new housing with an electronic sensor. Maybe plug a leak and get better info. But I'll have to research the toys I can attach the electronic sensor to.

[CASwede]

Or I could pull the circlip, remove the whole unit, and properly tighten the connection highlighted in red in my prior photo to stop the leak.

I should be thankful these are my greatest issues so far.

[Doug Liedblad]

Or I could pull the circlip, remove the whole unit, and properly tighten the connection highlighted in red in my prior photo to stop the leak..............

.

I am not sure that will stop the leak.

The last time I tightened mine I used a small screwdriver to keep the the bass part from turning and did it up hand tight. It shouldn't be tighter than that.

[CASwede]

Good info. Thanks all.

[MHKflyer52]

I just slipped under the car again to take a look. Now I see the connection with the circlip. Doesn't appear there is really any way to plug that hole.

The oil drips seem to indicate a leak at the point I've circled in red, inside the female connector. I had loosened the connection in this photo, but I also found it was a little loose under the car just now. Tightened it up best I can w/out pulling the circlip. I'll see if that stops it.

[ATTACH=CONFIG]1296[/ATTACH]

There is a gasket that should be installed between the brass part and the angle drive adapter as shown in the attached photo (Item 24a) and yes they are what looks like heavy paper.
My car had the same issue and I corrected it by replacing the seal and coating it with some gasket sealer and also the threads of the angle drive and the brass fitting surfaces.
MGB-037_1.jpg

Also here is a link to a PDF of the issue.

http://www.mossmotors.com/graphics/products/PDF/021-511.pdf

Hope this helps.

[Doug Liedblad]

I don't know if my angle drive has the gasket or not. Never looked. Mine is the angle drive to electronic signal converter but connects the same way.

I will look but it won't be soon.

[johnh]

Here's a $60 plug that will also function as an electronic speedometer should you decide to convert:

Is there room in the tunnel for that? I recall it being rather cozy back where the right angle drive attaches on my Caterham.

---john.

[CASwede]

Well, the issue has come to a head. My little leak is now a big leak. I checked on the washer at Moss Motors, but it lists it as a copper washer and not heavy paper. True?