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MG TD TF 1500 - Cooling the Head

Hi,
What would happen if the passage from the block up to the head would be a small hole that was only 2x3mm large? Is there another possibility for the cooling water to pass from the block to the head?
Best regards

Anders / Sweden
T Dahlberg

Not hardly. There's only one, or sometimes two tiny holes from the channel along the side of the block for water to feed the block.
The cooling system maximizes cooling for the head, especially the rear cylinder which would otherwise run much hotter.
The "banana" and "round" water passage holes between block & head allow some water to shunt through the block for adequate circulation.
JRN JIM

http://www.ttalk.info/XPAG_Cooling_System.htm

George Butz

Thanks for your response Jim and George,

My problem was that our Crossflowhead had only one small hole in the back, the second was forgotten. The single hole was also drilled in the wrong place so the remaining possibility for water to get from the block to the head was only 2 x 3 mm large. There wasn't any flood of water passing from the block to the head! Thats why I asked if there might be a pressure from the waterpump pressing water in some other place. I believe that the two tiny holes in the waterchannel on the side of the block are as big as the hole up to the head!
The holes are now two and the one that was in the wrong place has been welded and is now where it should be.
/Anders
T Dahlberg

Hi,

Just showing a photo of the gasket where it is possible to see where the hole in the crossflohead was drilled.

There wasn't much left for the water to pass!

/Anders

T Dahlberg

Didn't the factory blown record breaking XPAG's have external cooling pipes?

Maybe you can look into that?
Willem van der Veer

I had misinterpreted which area you were referring to. My assumption, you were discussing the channel along the side of the block with one, or sometimes two holes behind the core plugs, then up through the block to the back of the head. It is likely that less than 1% of the circulation takes that shortcut into the block.

Considering nearly 100% of the water enters the back of the head, there was no real effort to circulate water through the block. If they did, the hole/s in the channel would be larger. As the flow will take the path of least resistance, some of the water will drop down into the block on it's journey forward and then back up to the thermostat housing.

Opening up the passages won't hurt, but it probably won't make any measurable difference.
JRN JIM

This thread was discussed between 05/05/2014 and 10/05/2014

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