MD2020D Removed coolant drain plug - no water.

[VicS]

The cap without the rubber gasket immediately under the flat head of the cap must have lost its gasket in transit. It cannot have been made like that as it won't work ..... when the pressure builds up coolant will push past the first gasket and probably come out from under the cap. When it cools it will suck air in from the outside rather than suck coolant in from the expansion tank so the level of coolant in the block will get lower and lower whilst the expansion tank stays full.

Richard

I think you are wrong

He has not mentioned an expansion tank. I think you will find that there is just a simple "overflow " connection to the filler neck directing any escaping coolant into the bilges (#14) ... at least that's what the basic parts diagrams show. If that is so a second gasket under the top of the cap is not necessary.

If an expansion tank is fitted it's a whole different set up most easily explained with the diagram from the parts list:

if the neck is still securely attached I would ensure the coolant level is below the filler and then use wet and dry to sand off all the paint around the bottom the the neck and the adjacent top of the H/E and then degrease it with meths or similar. Then apply a good fillet of JB Weld or similar right around the neck. You could also apply a "rolled sausage" of Milliput or similar as this will be even easier although you will need a coarser wet and dry as a rougher surface will be required to ensure a good seal.

Richard

I think I would try a metal filled epoxy such as J-B weld original http://www.jb-weld.co.uk/j-b-weld-epoxy-adhesive/j-b-weld-original-epoxy-adhesive

 

[RichardS]

I think you are wrong

Although Volvo seem not to as they provide a filler cap with an upper rubber seal which is the one John decided to use.

Richard

 

[JohnGC]

It is the first of Vic's examples without the expansion tank.

There is no way I can fit the Thermex neck as there isn't enough room for the flange an bolts.
https://dl.dropboxusercontent.com/u/84858928/fn2.jpg

I am tempted to try some radiator seal to block the leak and then add a fillet of JB Weld around the neck to prevent it moving and strengthen the join.

 

[Ilduceglider]

John, this is the new radiator cap I used http://www.parts4engines.com/volvo-penta-md2010-md2020-md2030-md2040-header-tank-cap/ it leaked. The 2040 is similar but different in the area around the filler neck. There is a moat that we had to gasket up to the level surrounding to allow the Thermex flanges to sit on top. This moat was also uneven with slight corrosion, this is why we had to use paper gaskets and Loctite gasket goo. The repair was done in situ.

Cheers Peter

 

[Raine Storm]

Hi Dipper I to have a VP 2001 with a blocked drain hole ,I have cleared to about 50 mm and it seems to stop ,I sharpened a welding rod and really poked hard then had a look with a borrowed inspection camera / endoscope and it appears a dead end ,it's very bright where I have been prodding .are you sure it should go up straight about 6 inches .
if that is the case I could maybe drill it .
thanks in advance