Leaking thermostat housing

[rooster cogburn]

Hello
My o2 manitou 1330 with a Perkins non turbo engine keeps running water out behind thermostat housing. A new one has been fitted and we can’t seem to get it to stop leaking. Mechanic has been at it a couple of times. Anything obvious that we are missing.

 

[Bri963]

Hello
My o2 manitou 1330 with a Perkins non turbo engine keeps running water out behind thermostat housing. A new one has been fitted and we can’t seem to get it to stop leaking. Mechanic has been at it a couple of times. Anything obvious that we are missing.

Which engine? And can you send a picture of the leak? Obvious questions, is the hose okay, and is there a crack in the spigot?

 

[Gecko]

Hi rooster - welcome.

First, do you have the single or double thermostat housing?
Second, do you have the gear driven water pump? (the manual lists four pumps, but I think they are all gear driven)

The thermostat housing and bypass hose 90deg adapter are plastic and I imagine will split if abused

Have you had the bypass hose off? A split can start at the end of the hose and work it's way under the jubilee clip
(when I replaced mine, I used the soft silicon hose and wide flange T-bolt hose clamps because they don't bite into the hose as badly as the worm-drive jubilee clips)

If that checks out, I'd replace the gasket on the water-pump.

 

[V8Druid]

Hello
My o2 manitou 1330 with a Perkins non turbo engine keeps running water out behind thermostat housing. A new one has been fitted and we can’t seem to get it to stop leaking. Mechanic has been at it a couple of times. Anything obvious that we are missing.

has it corroded a track in the mate faces, that the gasket can't 'take up' ? I'm not familiar with this particular engine though

 

[rooster cogburn]

This is the old one before fitting new one

 

[Gecko]

That's not the engine I was expecting.

I'd suggest you hit it with a high pressure cleaner (or steam if you have it) so it's spotless and you can see where water is appearing.
It looks like there is no glycol in the coolant - either that is the cause of your current problem or it's been leaking for so long, the glycol is all gone. Either way, adding some glycol will give an obvious 'tell' where it's coming out.

Has the thermostat housing been off?
I'd also put the head gasket on the list.

 

[rooster cogburn]

Was topping up mixed coolant but ran out and was using water for a wee while. Oil as clean as a whistle so unlikely head gasket. The housing had been of and resealed with a tube type stuff until new housing came which is now fitted but continues to leak