Flathead V8 Welch Plugs

[Keith Webb]

OK... I found Automotive Surplus in Mitcham was open and they keep a range of welch in stock. Interestingly they said they had sold some to somebody else recently who had the same situation - two were missing when the sump was removed.

3/4" is the correct size, thanks Tony.

So the sump is now back on... the next job is to attack the water pumps with a press. Has anyone had experience in pressing water pumps apart? I'm thinking a bit of heat on the pulley and impeller might not go astray.

[Keith Webb]

So far managed to break the casting on one pump. Might wait for someone more expert to have a go at it.

Here's a shot of the new welch plug.

[John Stokes]

Originally Posted by Keith Webb

So far managed to break the casting on one pump. Might wait for someone more expert to have a go at it.

Here's a shot of the new welch plug.

Hi Keith your welch plug looks like it is up side down ? Thanks for the parts i have nearly finished the transfer case ,shift tower and linkages hope it rains tomorrow so i can stay in the shed catch up soon. John Stokes

[Tony Smith]

As in the post mentioned/linked above, I mentioned in 2004 that one of the engines I have has had the holes TAPPED for Allen Plugs. I'm only guessing (not sitting here in front of me ) that they were UNC thread, they could have been NPT, but find what plugs you can and tap that thread to suit. There is more than sufficient metal in the threads to tap into, and part of the plugs protrude into the water jacket, but they dont get in the way of anything.

Ian, you wouldn't need to seal the thread so much from leakage, as the sump gasket and some RTV Silicone would cover it, but more so as a corrosion inhibitor/antiseize to allow you to take the plugs out easily as often as you want to clean out the crud in the bottom of your water jackets. I'd guess you'd use the same thread sealer (Loctite, etc) that you would use on those head studs that thread into the water jacket from the top.

[Keith Webb]

Originally Posted by John Stokes

Hi Keith your welch plug looks like it is up side down ? Thanks for the parts i have nearly finished the transfer case ,shift tower and linkages hope it rains tomorrow so i can stay in the shed catch up soon. John Stokes

Hi John
No, it's the right way up - it's dished, not cupped, so it goes in with the convex side up which is then hit with a hammer and drift so it spreads to fill the hole.
Tony... there were no threads, just a shoulder for it to be fitted.

[Bob Moseley (RIP)]

Hi Keefy - snigger, snigger, sorry. At least you managed to get the water pumps out of the block. A lot of people are not aware of the holding bolt that is accessed through the bottom outlet. These can be a real bugger as often the bolt head is corroded. Now if you need new pumps, Mike Davidson here has them. Alternately in the part's suppliers section of this forum I have posted prices for the rebuild kits.

Didn't your welch plug supplier have any brass ones?

BTW, don't you want to link my 2004 thread to this one?

Bob

[Keith Webb]

Originally Posted by Bob Moseley

Hi Keefy - snigger, snigger, sorry. At least you managed to get the water pumps out of the block. A lot of people are not aware of the holding bolt that is accessed through the bottom outlet. These can be a real bugger as often the bolt head is corroded. Now if you need new pumps, Mike Davidson here has them. Alternately in the part's suppliers section of this forum I have posted prices for the rebuild kits.

Didn't your welch plug supplier have any brass ones?

BTW, don't you want to link my 2004 thread to this one?

Bob

That bolt in the hole is SUCH a bad idea, although having said that I haven't yet been defeated by one. This engine came close though with a corroded head. I had to hammer on a metric socket which did the trick.

The supplier didn't have any brass ones, so I thought this was a better option than no-more-gaps

Yes, I'd like to merge the threads but I can't seem to make it work.

[Hanno Spoelstra]

Originally Posted by Keith Webb

Yes, I'd like to merge the threads but I can't seem to make it work.

Done.

H.

[Tony Smith]

Originally Posted by Keith Webb

Tony... there were no threads, just a shoulder for it to be fitted.

I realise that the hole isn't factory threaded, but noted that on one of the engines that I have somebody had gone to the effort of doing this and I thought that the idea had some merit. If anyone wanted to do this, they would have to tap the thread into their block by machining away the shoulder to give a longer bore to thread.

[Keith Webb]

Originally Posted by Tony Smith

I realise that the hole isn't factory threaded, but noted that on one of the engines that I have somebody had gone to the effort of doing this and I thought that the idea had some merit. If anyone wanted to do this, they would have to tap the thread into their block by machining away the shoulder to give a longer bore to thread.

You'd have to be keen wouldn't you!

Incidentally I've just installed the engine. Milestone!