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Water Hose Heater Bypass TR4 Engine #641553
01/06/20 05:20 AM
01/06/20 05:20 AM
Joined: Jan 2013
Posts: 772
UK
BuyBritish Offline OP
Talk Morgan Regular
Happy Birthday BuyBritish  Offline OP
Talk Morgan Regular

Joined: Jan 2013
Posts: 772
UK
The Plus 4 TR4 engine Morgans either have a heater fitted or none. If no heater is fitted then a 'heater bypass hose is fitted this helps keep water flowing on the rearmost cylinder.

The question is where did it fit on the water pump end?

I can see where the pipe fits on the rear cylinder (normaly there is a heater varible control here but also a normal stop tap is fitted see photo marked with red ring.

So anyone with a pipe fitted with a Older Plus 4 fitted with the Triumph TR3 4 engines could you send me a photo of yours particulary the water pump end and bypass hose fitted?

Thank you.

[Linked Image]31772245993_aa1c969d3f_o by Robert & Ali Davies, on Flickr


[Linked Image]31740357674_4fdc0f1dba_o by Robert & Ali Davies, on Flickr


Rob Davies
Morgan 3 Wheeler 1934 MX
Morgan Series 1 1947
Morgan +4 1956 TR4
Morgan +4 2000 T16 Rov
Re: Water Hose Heater Bypass TR4 Engine [Re: BuyBritish] #641555
01/06/20 06:47 AM
01/06/20 06:47 AM
Joined: Jun 2015
Posts: 547
North Somerset, UK
D
Deejay Offline
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Deejay  Offline
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D

Joined: Jun 2015
Posts: 547
North Somerset, UK
I haven’t a definitive answer but it all seems a bit strange. If a bypass hose is essential to cool the rear cylinders, it would mean that they would suffer if someone chose to shut the valve off in summer.
However, if it is really needed, I would have thought it merely needs to connect that tap spigot with wherever the existing return pipe from the heater is connected to the main cooling system.


Doug

2011 +4 in Rich Maroon
Re: Water Hose Heater Bypass TR4 Engine [Re: BuyBritish] #641557
01/06/20 06:50 AM
01/06/20 06:50 AM
Joined: Feb 2010
Posts: 842
SimonH Offline
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SimonH  Offline
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Joined: Feb 2010
Posts: 842
It loops from the back of the head to the back of the water pump
Just imagine the heater wasn’t there

On the racers, we normally blank off the heater outlet completely and just feed the back of the water pump from a bulkhead mounted header tank


Simon @ Sifab.co.uk

Sifabtemporary@gmail.com
Re: Water Hose Heater Bypass TR4 Engine [Re: BuyBritish] #641561
01/06/20 07:19 AM
01/06/20 07:19 AM
Joined: Aug 2015
Posts: 827
A
Arwyn Williams Offline
Talk Morgan Regular
Arwyn Williams  Offline
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A

Joined: Aug 2015
Posts: 827
The reason why some Moss box Plus 4's have a heater and some don't is that a heater was an optional extra back in the day!

I've got to admit that I'd never heard of the heater take off bring used to keep the rear cylinder cool, I think that's rubbish personally - another myth which we are now inadvertently propagating.

Arwyn

Re: Water Hose Heater Bypass TR4 Engine [Re: BuyBritish] #641563
01/06/20 07:30 AM
01/06/20 07:30 AM
Joined: Feb 2016
Posts: 2,785
East Harling, Norfolk UK
Richard Wood Offline
Talk Morgan Expert
Richard Wood  Offline
Talk Morgan Expert

Joined: Feb 2016
Posts: 2,785
East Harling, Norfolk UK
The heater return is to water pump inlet Rob. Your second picture shows the pump inlet union of rad return, thermostat bypass and heater return.

There are four way heater control valves that maintain a flow back to the pump irrespective of heater setting. If the heater is to be removed though and its acknowledged that extra cooling is possible by using a heater union bypass then a pipe made up of right angle metal tubing and heater hose should achieve this. Otherwise as suggested above, not necessary and just blank off.

FWIW the similar era 2.3 diesel on my Land Rover had virtually the same heater hook up. When a 5 bearing 2.5 hybrid was built up it didn't have a union at rear of head for heater feed so it was taken from just before thermostat at front of engine.


Richard

2018 Roadster - Red/Magnolia - "Morton"
1966 Land Rover series 2a SWB
1960 Velocette Venom
Re: Water Hose Heater Bypass TR4 Engine [Re: BuyBritish] #641653
01/06/20 07:39 PM
01/06/20 07:39 PM
Joined: Jan 2015
Posts: 91
Barry, Vale of Glamorgan
S
Sinbad Offline
Just Getting Started
Sinbad  Offline
Just Getting Started
S

Joined: Jan 2015
Posts: 91
Barry, Vale of Glamorgan
Just rebuilt my TR4a engine. When the cylinder liners were removed the rear of No,4 liner was almost completely blocked with a build-up of crud. This resulted in a hot spot and overheating despite a "Fug blower" being plumbed in and open to the cooling system most of the time. The coolant flow around this area is undoubtedly lower than the rest of the block and flushing the block between coolant changed didn't shift the crud. I would suggest that if the heater is by-passed then the hose from the top of the engine could just be plumbed into the heater return hose by-passing the heater altogether but still giving coolant flow to the rear of the engine


1967 Plus 4 Drophead coupe with a TR4a engine
Re: Water Hose Heater Bypass TR4 Engine [Re: BuyBritish] #641721
02/06/20 09:04 AM
02/06/20 09:04 AM
Joined: Jul 2007
Posts: 16,782
Suffolk
John V6 Offline
Member of the Inner Circle
John V6  Offline
Member of the Inner Circle

Joined: Jul 2007
Posts: 16,782
Suffolk
Rob, I have this diverter valve in surplus stock if you want it feel free to come round & collect it.
[Linked Image]
[Linked Image]
John


JohnV6
2006 Indigo Blue Roadster S1

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