Lemming

Anyone know the size on the drain plug. Not the size of the hex needed to remove, the actual plug size (ie, 1/2 NPT)? Why, I'm looking for a simple solution for measuring trans oil temps. Easiest solution is to find a sender, or adapter, that will fit in the drain plug hole.

bad_monkey

Good idea - I think the plug is 22mm but I'll take a look and see if I can find the old one to measure.

Might be time to start a thread "Telemetry: things to measure on a 944 and how to measure them".

C

Lemming

At it's widest it is slightly larger than 24mm and it tapers down.

LuigiVampa

The way I normally figure stuff like this out is to take the bolt or nut and go to a parts store which has the nuts and bolts available see what fits. I know this is kind of a "duh" answer but it works.

Or you could just buy a new one from Pelican and drill a whole in it:

http://www.pelicanparts.com/cgi-bin/...9%2C%20Each%20

Lemming

Drilling and tapping is easy, it's getting the sender head to fit in the allen head recess that's the problem.

LuigiVampa

I think you would have to make it so you could unscrew the sender before removing the plug.

944Ross

PET calls it out as an M24 x 1.5. I would swear it's a taper thread, 24mm would be real close to 1/2"NPT, but I would expect the Germans to use ISO tapered threads, which are not the same as NPT.

Lemming

The sender head will just barely fit, so close that you cannot get a wrench or socket on it to completely screw it in, I tried!

I was looking on this website for a possible answer (http://www.conexmetals.com/thread/iso-coarse-thread.htm). I will measure the plug I have but I am pretty sure it is tapered. If not, I wouldn't expect it to seal.

JohnKoaWood

Drill through oversized, and use a nut to secure the sender on the inside... a couple of sealing washers to seal the mess up and you should be in buisness...

OR you could always drill and tap a different location on the case... bottom of the case would be prefereable to make sure the sender is always within the fluid.

Lemming

I would then have to use a pipe wrench to install/remove the plug as the sender would need to be removed prior to using the allen head.

JohnKoaWood

Depending on the sensor... type you could try to source a low profile sensor, and recess the allen wrench to fit over the sensor (I actually have 3 different tools for the trans plugs, the largest of which is a simple 17mm? allen wrench from sears), or extend the walls of the plug to accept a wrench... just thinking outside the box here...

V2Rocket

is the plug aluminum or steel? if steel, get a nut that fits in the allen socket and weld it, and put the sender inside the nut. then remove the plug as a whole with a standard wrench.


if al, tack an AN fitting with shoulders for a wrench to the plug

Van

It's definitely metric, as apposed to NPT. For my trans cooler, I welded a steel -10AN fitting on a stock plug.

Any reason why you don't want to just measure temp from the outside of the case? Much cleaner.

I picked up some of these: http://www.paperthermometer.com/pages/indust.html#8temp - but haven't actually used them yet.

dontnow

How about something like this, they have a couple thread sizes, and use a reducer if needed:
http://www.mooreparts.com/store/product/3589/VDO323064/

V2Rocket

too risky to tap the oem trans cooler?