Series 3 heater hose connection to back of the engine

My S3 project was originally a petrol and had a diesel 10J installed long before I bought it.
Heater was never re-connected AFAIK, so I thought It would reconnect the heater.
The connection point at the back of the engine had been blanked off.

I bought a new hose connector but it doesn't fit in the cylinder head - the threads on the blanking plug is finer than that of the connector.

Has the wrong thread bolt been forced into the head or is the connector wrong.
I dont know what thread is correct. But using the gauge in my tap/die set the connector appears to a 19 pitch BSP and is 16.3mm in diam whereas the bolt thread is 15.8mm diam with 100 pitch
Any help would be greatly appreciated.

Oddly the heater control valve is fitted at the front of the engine but the hose is blanked before the connection with the long pipe that goes to the back.

The connector I bought is part number 624091 . Is that correct ?

What year is your cylinder head check the information in attached pdf
See pic of optional parts metric and imperial pipe connector to block

Mines a petrol but I used a plumbing fitting temporarily until I could get the adapter delivered and it worked fine - see this thread for details / pic
https://www.landyzone.co.uk/land-ro...ater-hose-adaptor-solved.369627/#post-5129616

Blackburn said:

What year is your cylinder head check the information in attached pdf
See pic of optional parts metric and imperial pipe connector to block

Click to expand...

Many thanks.
I didnt realise later heads changed to "american" metric m16x1 (not M16x1.5) The adapter ERC9453 is about £50 !! (probably why it the heater was never connected ), it is x10 the price of the imperial - typical.
Would it be possible or sensible to use a 3/8BSP tap in the metric adapter hole. Or will I most likely ruin the head ? The latter probably.

JB Weld.

Have you seen this post ?
Any ideas? Snapped Heater Hose adaptor...SOLVED | LandyZone - Land Rover Forum

Blackburn said:

Have you seen this post ?
Any ideas? Snapped Heater Hose adaptor...SOLVED | LandyZone - Land Rover Forum

Click to expand...

yes I did but it didnt help much - Unfortunately it appears that the m16x1 threaded hole in the cylinder head is already too big to be tapped out to 3/8" BSP, so I'm going to have to take it on the chin and buy a ERC9543 adapter.
Shame LR chose M16x1 instead of M16x1.5 - a much more common thread size these days.

Bobsticle said:

JB Weld.

Click to expand...

??? JB weld

Blackburn said:

What year is your cylinder head check the information in attached pdf
See pic of optional parts metric and imperial pipe connector to block

Click to expand...

I dont know the manufacturing date but I believe it to be a late 2.25 diesel. The cylinder head says HRC1353 and the engine number is 10J00338B

Jules59 said:

??? JB weld

Click to expand...

JBWeld. Holding American cars together since 1969.

Jules59 said:

I dont know the manufacturing date but I believe it to be a late 2.25 diesel. The cylinder head says HRC1353 and the engine number is 10J00338B

Click to expand...

I replaced mine on a late diesel (5 bearing) last year. I just punched the part number in Google and ordered the cheapest one. It can’t have been much money because I’m very tight and wouldn’t spend over ten pounds for a simple plumbing fitting.
I can’t remember the supplier but it came unbranded in a plastic bag from memory.

Bobsticle said:

I replaced mine on a late diesel (5 bearing) last year. I just punched the part number in Google and ordered the cheapest one. It can’t have been much money because I’m very tight and wouldn’t spend over ten pounds for a simple plumbing fitting.
I can’t remember the supplier but it came unbranded in a plastic bag from memory.

Click to expand...

Try it now ERC9453 - but sit down first

Bobsticle said:

View attachment 256691
JBWeld. Holding American cars together since 1969.

Click to expand...

cheers

Jules59 said:

Try it now ERC9453 - but sit down first

Click to expand...

Oh trust me. The cheap one ‘will’ fit.

True, brass fitting v cast steel cylinder head?
Cylinder head wins. PTFE tape cures any remaining wounds.

Turner Engineering list part you require for £35.00

Mark Frewin said:

Turner Engineering list part you require for £35.00

Click to expand...

+ VAT + Delivery = £51.60 unfortunately the devil is in the detail

JB Weld it is then.