Just attempted filling my gearbox today and the oil began to drip out of a small "hole" on the bottom of the main case. Cannot find any reference to it in my rather ancient sierra haynes manual. Anyone any idea how to fix it properley before I resort to a bodge?
Can you get a photo of the hole
yes but I cannot post it it worked fine earlier
Description
Wahooo. Doesn't really show the hole though but it was the best I could do. Its about 9mm diameter and maybe 5mm deep.
Is it a machined hole or damage? Not easy to tell from picture
definately a machined holed. You cannot see for the oil
.
Will have a look at my car tomorrow to see if I can see what the hole is if I get a chance .
Can't quite work out which part of the gearbox is from the pic. I have my gearbox to hand if you have another one and I will have a look now.
I reckon that the hole has been drilled by someone for whatever reason may be to get the oil out as they do not have a drain plug, you may need to thread it an put a bung in it
quote:
Originally posted by Thinking about it
Can't quite work out which part of the gearbox is from the pic. I have my gearbox to hand if you have another one and I will have a look now.
Type 9's don't have a hole in the bottom of the main case... see my previous post.
Cheers.
Steve.
Just had a look and no hole in mine.
I think Stevec has the answer.
Thanks steve. It may be a job to tap because I doubt it's deep enough. Might have to resort to that epoxy steel putty stuff.
I would persevere and try and thread it if you can, you will always be worrying that the putty will come out and lose all of your gear oil.
What about a large blind rivet?
Steve.
Rivet might be an idea. Thinking about it now I wonder if someone hasn't tried to drill a drain hole as you say and either broken off drill or
more likely tap in it because it isn't all the way through. Anyone see any issues with using a blob of weld to plug it?
[Edited on 20/4/08 by Mole]
I would leave the hole open in days gone by all bell housings had holes to allow oil to escape therefore not allowing the cluth plate to become contamunated. they did have a pin inserted called a jiggle pin the idea being that you moved it by hand (jiggling) which allowed any iol to escape
Me thinks the front seal is knackered or you have overfilled the box
The hole is in the main case not the bell housing.
that photo shows the underside of the box, and the raised "bump" (actually "lowered" as its the very bottom of the box) is the
recess where the magnetic plug sits normally.
Looks like its been drilled by somebody, not a big problem, as SteveC said, check the hole size, tap it out appropriately and then seal it with a
(thin headed so it doesn't get knocked) short bolt and copper washer.
Would it be possible to drill all the way through drill and tap it to take a plug of some sort?
Use J B weld as long as you can clean it and get it oil free it will seal that hole no problem.
you could use a rivnut if its a thin casing - then use a stainless cap head bolt
JB weld is pretty impressive stuff.
I had a pin hole in one of the main casing gaskets. When oil was hot and car running it would ooze out. Not wanting to remove gearbox for a while i JB
welded it. Temp fix was a lot more permanent than i expected.
Surrounding area must be clean. I roughened the surface too. You will not be able to do the repair with oil in gearbox. I got away with it cos hole
was at top. If hole is too large i would say plugging it mechanically first would be better job. Lets hope drill or tap isnt stuck in the hole and you
can drill out to tapping size to fit bolt and copper washer.
I think I would tap it and loctite a grub screw in so it doesn't protrude from below.
Actually used that two part putty stuff. Really didn't fancy drilling it. Cleaned the surface first and pushed it right into the hole. I've put some oil (back) in and so far so good.