Suitable water temp sender for Morris Marina thermostat housing

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jagnut66
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Suitable water temp sender for Morris Marina thermostat housing

Postby jagnut66 » Sat Aug 24, 2019 2:59 pm

Hi,
I have bought this (pictured) Morris Marina thermostat housing in which to install a water temp sender on my 948 engine. I have done this before but can't find the receipt for the sender or remember where I got it from (wish I'd bought a spare now - doh!).
Does anyone know which sender will fit this (or have a link to one)?
I tried my local motor factor but all he kept saying was that it originally took a blanking plug, which I believe is technically correct but not what I am looking for.
As always any help is greatly appreciated.
Best wishes,
Mike.
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philthehill
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Re: Suitable water temp sender for Morris Marina thermostat housing

Postby philthehill » Sat Aug 24, 2019 3:19 pm

The threaded hole in the top of the Marina thermostat housing is indeed normally fitted with a blanking plug which can be removed to top up and check the coolant level.

The way I got around the difference in size of the thermostat housing top hole and the size of the hole required for the transmitter was to purchase a brass blanking plug https://www.ebay.co.uk/itm/Land-Rover-D ... 2749.l2649 and drill and tap to suit either the adapter (capillary) or the transmitter (electrical).

Also done by Sandun if you can find his thread.
Picture by Sandun
20171205_161258 thermostat housing.jpg
20171205_161258 thermostat housing.jpg (2.5 MiB) Viewed 405 times
I put this link in as it shows the Marina thermostat housing with the adapter fitted and placed on a head.

viewtopic.php?f=4&t=67822&p=618567&hili ... ng#p618567

I drilled the three 5/16" stud holes to 3/8" to give a better alignment between thermostat housing and Minor radiator.

Make sure that the transmitter does not foul the thermostat when the thermostat opens.


jagnut66
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Re: Suitable water temp sender for Morris Marina thermostat housing

Postby jagnut66 » Sun Aug 25, 2019 10:05 am

Thanks Phil,
I have purchased a brass blanking plug, with a view to drilling and tapping it to suit a sender unit.
I will still be looking out for a sender like the one I acquired last time, that'll teach me not to buy a spare and keep the box, eh! :roll: :lol:
Best wishes,
Mike.
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paul 300358
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Re: Suitable water temp sender for Morris Marina thermostat housing

Postby paul 300358 » Sun Aug 25, 2019 10:22 am

Mike,
The one that I have fitted is a Intermotor 52760 Temperature Transmitter. This fits into the standard head threaded boss. £6.50 off Amazon.

JOWETTJAVELIN
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Re: Suitable water temp sender for Morris Marina thermostat housing

Postby JOWETTJAVELIN » Sun Aug 25, 2019 12:09 pm

Does your 948 not have a plug at the front of cylinder head?
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geoberni
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Re: Suitable water temp sender for Morris Marina thermostat housing

Postby geoberni » Sun Aug 25, 2019 12:51 pm

JOWETTJAVELIN wrote:
Sun Aug 25, 2019 12:09 pm
Does your 948 not have a plug at the front of cylinder head?
Not unless it's been modified with a latter head. My SII had a 948 Goldseal fitted at some time in it's life, I'm not sure when, and that had the blanking plug, but original Minor Era 948 engines did not.
Basil the 1955 series II

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JOWETTJAVELIN
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Re: Suitable water temp sender for Morris Marina thermostat housing

Postby JOWETTJAVELIN » Sun Aug 25, 2019 6:03 pm

Strange, I wonder when they were introduced. My 948 has a blanking plug but it is in the last 1000 of production if that makes any difference.
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philthehill
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Re: Suitable water temp sender for Morris Marina thermostat housing

Postby philthehill » Sun Aug 25, 2019 8:59 pm

A photo of the head with blanking plug shown and details of the head casting number would be appreciated.


paul 300358
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Re: Suitable water temp sender for Morris Marina thermostat housing

Postby paul 300358 » Sun Aug 25, 2019 11:11 pm

How difficult is it to remove the blanking plug for the temp sender? I had to weld a wheel nut on to remove the blanking plug so that I could fit a bypass hose on a 940 head.

philthehill
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Re: Suitable water temp sender for Morris Marina thermostat housing

Postby philthehill » Mon Aug 26, 2019 8:10 am

I have never had any difficulty in removing the temp gauge blanking plug as it is a much more solid item than the bypass hose stub and has the benefit of a hexagon head for a socket or spanner to grip against.
Temp gauge transmitter hole (940 head) at bottom right of photo below.
100_2635.JPG
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jagnut66
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Re: Suitable water temp sender for Morris Marina thermostat housing

Postby jagnut66 » Mon Aug 26, 2019 7:46 pm

Does your 948 not have a plug at the front of cylinder head?
Hi,
No holes or blanking plugs on mine...
Best wishes,
Mike.
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ampwhu
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Re: Suitable water temp sender for Morris Marina thermostat housing

Postby ampwhu » Mon Aug 26, 2019 10:02 pm

My 1098 engine on my 63' has no thread for a temp sender. It's the original engine.

philthehill
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Re: Suitable water temp sender for Morris Marina thermostat housing

Postby philthehill » Mon Aug 26, 2019 10:37 pm

The 1098cc engine is/should be fitted with the 12G202 cylinder head which has a temp transmitter fitment hole just under the thermostat housing on the spark plug side of the head.


jagnut66
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Re: Suitable water temp sender for Morris Marina thermostat housing

Postby jagnut66 » Mon Aug 26, 2019 10:54 pm

Postby paul 300358 » Sun Aug 25 2019 9:22 am
Mike,
The one that I have fitted is a Intermotor 52760 Temperature Transmitter. This fits into the standard head threaded boss.
Hi Paul,
This will fit my Marina housing?
Many thanks,
Mike.
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philthehill
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Re: Suitable water temp sender for Morris Marina thermostat housing

Postby philthehill » Tue Aug 27, 2019 7:55 am

The standard temp gauge hole/thread in the head is 5/8" UNF and the hole/thread in the Marina thermostat housing is 1/2" BSP (13/16").
The hole in the head has a seat for the transmitter to seat and seal against. The Marina thermostat housing does not have a seat which may make it difficult to seal the transmitter in the housing.
The only way round it is to make/use an adapter to suit either the capillary type transmitters or the electrical type transmitter.
When the early capillary type transmitter is fitted to the head there has to be a another 5/8" UNF male to 1/2"BSP male adapter screwed into the head to allow the 1/2" BSP female nut that secures the capillary tube bulb to be attached.
Later capillary type transmitters when fitting to the head will also need adapter https://www.moss-europe.co.uk/adaptor-t ... soc=506734
As the Marina Thermostat housing thread is 1/2" BSP a double ended 15mm pipe joiner can be screwed into the housing which will accept the early capillary tube transmitter and securing nut.
When fitting the capillary tube - the clearance between capillary bulb and thermostat must be checked.


paul 300358
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Re: Suitable water temp sender for Morris Marina thermostat housing

Postby paul 300358 » Tue Aug 27, 2019 9:44 am


geoberni
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Re: Suitable water temp sender for Morris Marina thermostat housing

Postby geoberni » Tue Aug 27, 2019 10:04 am

paul 300358 wrote:
Tue Aug 27, 2019 9:44 am
What's a 1/2 inch NPTF? https://www.carbuildersolutions.com/uk/ ... X8QAvD_BwE
It's American 'National Pipe Taper Fuel'. How that compares to 'British Standard Pipe', I've no idea.

Perhaps your link is for people maintaining vintage US vehicles. :-?
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philthehill
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Re: Suitable water temp sender for Morris Marina thermostat housing

Postby philthehill » Tue Aug 27, 2019 10:27 am



paul 300358
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Re: Suitable water temp sender for Morris Marina thermostat housing

Postby paul 300358 » Tue Aug 27, 2019 10:38 am

Its interesting as both 1/2 inch NPTF and 1/2 inch BSP have 14 tpi and 1.8143mm thread pitch. But they could be slightly different diameters.

geoberni
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Re: Suitable water temp sender for Morris Marina thermostat housing

Postby geoberni » Tue Aug 27, 2019 11:09 am

paul 300358 wrote:
Tue Aug 27, 2019 10:38 am
Its interesting as both 1/2 inch NPTF and 1/2 inch BSP have 14 tpi and 1.8143mm thread pitch. But they could be slightly different diameters.
I just found this:http://www.flow-controls.com/news/The-d ... on-20.html

If I read this correctly, at 1/2" and 3/4" they are the same :-? :-?

Where there is a difference is that the American one has the F suffix, indicating it is for 'Fuel' which are designed for a dry interference fit between male/female threads, whereas a normal NPT/BSP would have space at the peaks and troughs of the thread to use a sealant, e.g. tape or paste.
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