Thread Sizes

[hiking bear]

Can someone please tell me what the thread sizes are for; 1) The bolt that holds the bottom of the rad cowling to the axle carrier,One bolt each side.... 2) The stud thread that holds the rear axle tubes to the differential housing, lots of them!

[Bensdexta]

Can someone please tell me what the thread sizes are for; 1) The bolt that holds the bottom of the rad cowling to the axle carrier,One bolt each side

If you are referring to the two bolts that secure the radiator to the axle carrier, on mine these are removable coach bolts that slip into notches on the underside of the rad. The bolts appear to be 3/8"dia x 1 1/2" long. I can't judge what the thread is, but there are approx 24 threads/inch. Pretty sure they are original.
All the best,

[Mark]

1. The bolts used to hold the radiator in place are 3/8 X 2 inches long, they are called here in the US, carriage bolts, it's a rounded head bolt with four sided square under the head that slides into the metal piece under the radiator keeping the bolt from turning whilst you tighten the nut. You can use a course thread or fine thread, it won't matter because they don't thread into anything. Be sure you use a piece of hard rubber between the radiator and frame. Don't bolt it down solid.

2.The studs are 7/16 course thread that fits into the axle housing, with 7/16 fine thread that holds the axle and brake backing plate on.
I'm not sure as to their length. Probably 2 1/2 to 3 inches long. Your best bet would be to take one out and take it to your bolt dealer in your town.

The bolts are NOT metric, just in case you weren't aware of that, but I'm sure you are. I'm just trying to cover all the bases.

[hiking bear]

I didnt make myself clear. The bolts at the front are the ones that hold the bottom of the nose cone to the axle carrier and not the carriage bolts that hold the rad. They actually bolt through the sides of the cone and into the ends of the axle carrier. Sorry for the confusion.

[Mark]

If your talking about what I call the "trumpet" that houses the axle, and bolts on to the main differential housing, and if my memory is correct those were 3/8 course studs that went into the diff housing and fine thread on the outside, probably 1 3/4 or 2 inches long. There are a bunch of these. They are just standard studs, here in the US, I don't know how things are over there, we've been a little slow changing to the metric system, although there are no metric bolts or nuts on our Dexta's that I've ever found, and I've had mine almost completely apart at one time or another.
If I was you I'd take one out and take it with me to the bolt store to be sure you get the right one. The best way to get them out is to use 2 nuts, turn the first one down giving room for the second one, take two wrenches and tighten the nuts up tight to each other, then take one wrench on the first nut and see if the stud comes out. If you have some easing oil I'd spray them all good before I started this process.
I don't know if they sell P B Blaster in your area but if they do it's some really good penetrating oil.
Are you going to renew all these studs? Are you doing a full restoration?

[hiking bear]

No i am not replacing all of them. Basically the pick up hitch has been removed and 3 studs either side of the diff housing are missing. Im aware that nothing on these is metric its just that im not up on the old type threads. On a different subject and just out of interest the Land Rover Defender uses both metric and unf,can be confusing!

[bobfaecullen]

According to the parts list the bolts that go through the bottom of the front nose cone are 5/16 UNC x 5/8" long, can't see anything for the rear axle trumpets.

Bob

[Bensdexta]

According to the parts list the bolts that go through the bottom of the front nose cone are 5/16 UNC x 5/8" long, can't see anything for the rear axle trumpets.

Yes that's what the parts list says, but on my Dexta they seem to be 3/8" dia. I'm guesssing it's UNC thread, but my captive nuts on the axle carrier are corroded, so I'm reluctant to force the bolts without knowing what the thread is.

Can anyone confirm the lower nose cone bolts are 3/8" UNC ?

[Bensdexta]

Can anyone confirm the lower nose cone bolts are 3/8" UNC ?

Yes the lower nose cone bolts are 3/8" UNC.
The Parts List is incorrect - another sleepy day at Dagenham.