As I posted before, my ZED chucks its water out when I give it some stick. I thought the system was pressurizing from either a crack in the head or block.

BUT, today I got round to running it up and putting a Block Tester on it, this proved negative, No gas in the water. :hyper:

 

Now, I've been wracking my brain and realised that this problem started after I fitted a lightened and smaller underdrive pulley so the pump isn't turning so quickly. the engine runs fine, sweet as, no misfire or any other tell tale sign of a crack in the cylinder area.

 

Has anybody else had cooling probs due to underdrive pulley or a weak water pump?? The temp gauge does not go over halfway and its never shown as overheating. I can leave the engine idling for hours and it never chucks the water out or gets hotter than normal temp, incidentally the fan doesn't come on either, I can run it and rev it, still nothing, but as soon as I run down the road and put it under load the water comes out of the expansion tank. Could this be due to the extra heat from the turbos, load and the fact that the water isn't moving quick enough?

 

I've though of a blocked rad but this gets nice and warm all over. So any experiences of waterpump trouble guys and girls.???

 

Jase

How long did you have the tester on for? Sometimes it takes a good 2 mins before you get the colour change :( Really does sound like HG to me

Andy, I had it on for over 5 mins and did it twice with diffrent fluid???!!! The Block tester kit is brand new.

Yes seems like HG or crack to me too. Only thing I have a problem with is that it will run at ldle with no probs, I can drive it normally and no probs, the problem is when its under load.

Any ideas??

Sometimes head gasket problems take a while to emerge!

 

When you take it out and thrash it is under pressure, but to do the head test you cannot get access to a overly pressurised cooling system.

 

So the leak may dissappear when the cooling system is under normal conditions!

Yes but the combustion gas will remain in the water long enough to detect. I took the car out and put it under load. Then waited a while before releasing the pressure then started car up and applied the block tester. No Gas according to tester.

The H/Gs were only done when the engine was rebuilt 4K ago, so I was thinkin crack but not so sure now. Although I suppose only visual inspection and pressure test of each component will show it up.

Engine strip again i suppose :cry: :cry:

What gauge are you using as the standard water temp and oil presure are generally very inaccurate.

 

for it to spit water out it means that your system is either presurising due to the introduction of combustive gasses, excessive temps, an air lock or perhaps a faulty/knackered rad cap.

 

You could try bleeding you system first to get rid of any airlocks (check for wet carpets in pasenger footwell) get a new rad cap and see if that works, but to me it sound like the start of head gasket failure. Sorry

As I posted before, my ZED chucks its water out when I give it some stick. I thought the system was pressurizing from either a crack in the head or block.

BUT, today I got round to running it up and putting a Block Tester on it, this proved negative, No gas in the water. :hyper:

 

Now, I've been wracking my brain and realised that this problem started after I fitted a lightened and smaller underdrive pulley so the pump isn't turning so quickly. the engine runs fine, sweet as, no misfire or any other tell tale sign of a crack in the cylinder area.

 

Has anybody else had cooling probs due to underdrive pulley or a weak water pump?? The temp gauge does not go over halfway and its never shown as overheating. I can leave the engine idling for hours and it never chucks the water out or gets hotter than normal temp, incidentally the fan doesn't come on either, I can run it and rev it, still nothing, but as soon as I run down the road and put it under load the water comes out of the expansion tank. Could this be due to the extra heat from the turbos, load and the fact that the water isn't moving quick enough?

 

I've though of a blocked rad but this gets nice and warm all over. So any experiences of waterpump trouble guys and girls.???

 

Jase

 

I had a similar problem with two previous cars, they weren't 300's but they keep pushing water out. I went through the hassle of the tests which showed no hg problems. On both it turned out to be a faulty seal on the caps on the bottle!!

Yes but the combustion gas will remain in the water long enough to detect. I took the car out and put it under load. Then waited a while before releasing the pressure then started car up and applied the block tester. No Gas according to tester.

The H/Gs were only done when the engine was rebuilt 4K ago, so I was thinkin crack but not so sure now. Although I suppose only visual inspection and pressure test of each component will show it up.

Engine strip again i suppose :cry: :cry:

 

Cracks in the head and block on a 300 are rare, so my fingers are croosed for you!