Folks, I thought I had a leaky welch plug and since it was in an awkward spot I put off looking, now I have I don't know exactly what I am looking at - these holes were filled predominantly with epoxy but when trying to get it off, what appeared to be cast plugs snapped leaving some in situ.
Can anyone tell me what supposed to be here and what thread it has, it looks to be 1" cast plugs but I am open to suggestions. This is under the inlet/exhaust manifold on the water pump in side.
I'm figuring If it has any thread left, I clean up the thread with a thread cleaning tap (hence the need to know what sort of thread) and then plug it with a plug, would I use teflon or something, I find it hard to understand how a straight plug in the side would hold the water, although its not under a great deal of pressure.
The rear one was for a screw in engine block heater.
I seem to recall it was the same as the small plug of a 44 gallon drum. I don't know the thread, but it has been covered before here so a search may bring it up.
They are aluminium screw-in welsh plugs. The SIII has press-in ones in the same spot.
I can't remember the thread, but I did machine up a custom tap to recut the threads when I needed to fit new ones. You are welcome to borrow it (I think it is still in Brisbane).
The aluminium plugs can be purchased from LR places. You may also be able to just drill out the holes and fit normal welsh plugs.
Yes, you could be correct isuz, as the image only shows three. The Parts Book shows the one I referred to as the last one of four in line & refers to it as:
" 4. Plug for immersion heater boss".
It had an old (1964) P/N of 527269
The others shown in the book are referred to as Core Plug 1" dia. 1 1/2" dia. & 1 3/8" dia. but doesn't point out which is which.
My (army) parts book says the small front one is 1 1/8" x 16tpi with whitworth thread form, the rear small one is a 1" UNS thread and the large one is not idedtified.
When I rebuilt a motor with the same problem I just enlarged the hole very slightly and tapped them 3/8" BSP and the large one might have been 1/2" or 3/4" BSP and fitted normal pipe plugs.
Having just replaced these myself, I know what they are. They are tapped at 1" British Standard Conduit. Use a thread file to clean them out, then thread in the new plugs (buy them from Series parts dealers). You are then meant to peen them in, to expand them into the thread and seal it all up. They are made out of aluminium. When I replaced mine, I inserted them with thread tape, and did not peen them. I do not know if this was a goood idea or not. When you buy the the plugs, measure them. I found that some were just under 1" and fitted well, while others were just over 1" and did not fit.
For those of you who do not know, there are more welsch plugs underneath the rocker cover. On the 2.25L diesel engines, these are the dished type. On petrol engines, I am not sure if they are the dished or the 1" British Standard Conduit type.
The "Plug for immersion heater boss" is the plug slightly above and to the right of the "normal" welsch plug, above the starter motor. In your picture, this is exactly underneath (graphically) the top ball joint on the chasis to carburettor joining rod. This plug, I believe, is tapped in BSP.
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