Info needed: Morris C8 radiator

[guy labbe]

I am a bit puzzled by this discussion. I have two Morris C4 for the moment and didn't find a thermostat in any of these two engines and even don't can find a notification about a thermostat in the workshop manual.

On my C4 the airlock valve was missing but luckily I did found a complete set up in Norway.

[guy labbe]

on the left side of the picture you can see the air lock set up.

[Mike K]

Originally Posted by guy labbe

I am a bit puzzled by this discussion. I have two Morris C4 for the moment and didn't find a thermostat in any of these two engines and even don't can find a notification about a thermostat in the workshop manual.

On my C4 the airlock valve was missing but luckily I did found a complete set up in Norway.

Even If a thermostat is not an original item in the 4 cyl. engines , it is worth Paul trying a thermostat as an experiment because it might be the answer to his issue. Are there any more of those NOS parts from Norway available ? It has been ages since I last heard from Rolf.

Without a thermostat in the C4 , there must have been some kind of restriction in the coolant outlet from the engine, limiting the coolant flow to the header tank . The thermo syphon system requires that there is a significant temperature difference between the engine and the radiator , this difference aids the coolant flow . If the engine and the radiator are at the same temperature ie no thermostat fitted , then that is not ideal and can lead to problems

[guy labbe]

That's a fine answer but what about the non existed thermostat in the workshop manual ? for sure i think a thermostat is the best way to go but on these engines I have I don't can really find the provision to fit a thermostat ??

[pauldavies]

Hi gentlemen and where do I start, machining isn't a problem as it's been my trade since I was 15 so no issues there it was just getting use of a lathe, the current castelatated ring has a rubber seal although the reason I am making a new ring is the one I have is distorted due to hammering the thing to remove it over time also I will make the funnel with a thicker flange to stop warpage. I have lapped the ring but where the rubber seal sits it has high spots under the castelation points and these high spots can prevent a good seal. I also have new rubber to make a new seal when all is done, in regards to the thermostat it does mention one in the manual but for only "quick warm up reasons" and not for any pressure holding in fact the engine has a bi-pass pipe that goes around the thermostat. I will send my spring to a company in Brisbane on Monday as they reckon they can make a stainless replacement, not sure the new pressure of this spring will have any adverse effect but my reasoning would be it will greatly improve the seal at this point. Fan belt is working and no slippage noted. The manual doesn't show the thermostat but does mention it so I for no other reason than elimination of a problem would like one if anybody knows where?
Thank you all and I am open to all advise, thanks for the photo Guy and my assembly is the same as yours.
Paul

[Richard Farrant]

Originally Posted by pauldavies

I will send my spring to a company in Brisbane on Monday as they reckon they can make a stainless replacement, not sure the new pressure of this spring will have any adverse effect but my reasoning would be it will greatly improve the seal at this point.

Hi Paul,
The only thing that lifts the sleeve off its seat against the spring is the screwing down of the radiator cap, to allow steam to escape, so spring rate would not appear to be too critical.

regards, Richard

[pauldavies]

Thanks Richard and further to the enquiry on the fan-belt adjustment there isn't any I can see, I took it off when I did the cylinder head and just couldn't remember seeing adjustment so will have to get another belt just in case. The thermostat I imagine will be the same as the champ one? I will check it out as they are still available and the only thing I didn't mention was the cap was down tight.
Regards
Paul

[guy labbe]

That's the right water pump for a Morris 4 cylinder engine , you can see that there is a adjustment on it.
The adjustment is done by getting the two sides of the pump pulley closer together so the V belt is running higher on the pulley.