Thread: Coolant leak

ok. so my cooling system is overpressurised. as advised i looked and inspected the oil cooler tube and all looked fine and dry. I did notice some dried coolant that I think may be associated with my issue, i also noticed a warped what i think to be exhaust manifold gasket right where my dried coolant is.
Also some facts, td5, 2002 210k, no HG done, always ran proper coolant, never been above the horizontal part on the temp gauge though it does get ricisulously hot in there, after 10mins/7k's I burnt myself on the hook next to the acoustic cover front left bolt. Had water pump issues which were rectified not too long ago and everything was fine for a a few months. No sign of milkshake in the oil and i dont lose as much oil now that ive changed the turbo to sump drain pipe gasket. attached are pics.

Originally Posted by trevor

ok. so my cooling system is overpressurised. as advised i looked and inspected the oil cooler tube and all looked fine and dry. I did notice some dried coolant that I think may be associated with my issue, i also noticed a warped what i think to be exhaust manifold gasket right where my dried coolant is.
Also some facts, td5, 2002 210k, no HG done, always ran proper coolant, never been above the horizontal part on the temp gauge though it does get ricisulously hot in there, after 10mins/7k's I burnt myself on the hook next to the acoustic cover front left bolt. Had water pump issues which were rectified not too long ago and everything was fine for a a few months. No sign of milkshake in the oil and i dont lose as much oil now that ive changed the turbo to sump drain pipe gasket. attached are pics.

May I suggest remove the small hose from the oil cooler, and inspect the spigot on the cooler the hose fits on. Quite often after time this spigot can develop pin holes. Also, squeeze the hose, it looks a bit " bulgy" to me, is it soft? If you remove the hose, to make it easier, there is a 10 mm bolt holding the steel pipe onto the back of the engine, remove it to give you some " give". Bob

Originally Posted by dearot

Actually mine is losing coolant and I found traces of coolant on the exhaust manifold and under. Could it be leaking exhaust manifold? Thanks.

I don't believe that there are any coolant galleries in the exhaust manifold.

To get to the plug, which is between cylinders 3 & 4, you need to take off the manifold and manifold gasket. Before that, you need ot remove the turbo. you've also got to remove the a/c pump in order to get to one of the nuts on the exhaust manifold. The plug apparently has an o-ring. Mine, at 185k, had totally disintegrated to a small mass of gunk that had to be dug out.

I've pulled out the plug, cleaned it up and put on a new o-ring as part of some preventative maintenance, and replaced the water pump, gaskets on the oil cooler, hose on the oil cooler, gasket on the PS pump, warped manifold and so on.

Originally Posted by Pinelli

I don't believe that there are any coolant galleries in the exhaust manifold.

To get to the plug, which is between cylinders 3 & 4, you need to take off the manifold and manifold gasket. Before that, you need ot remove the turbo. you've also got to remove the a/c pump in order to get to one of the nuts on the exhaust manifold. The plug apparently has an o-ring. Mine, at 185k, had totally disintegrated to a small mass of gunk that had to be dug out.

I've pulled out the plug, cleaned it up and put on a new o-ring as part of some preventative maintenance, and replaced the water pump, gaskets on the oil cooler, hose on the oil cooler, gasket on the PS pump, warped manifold and so on.

This what I get on D2 (attached). I dont know where the traces of coolant came from. Any idea?

Originally Posted by dearot

This what I get on D2 (attached). I dont know where the traces of coolant came from. Any idea?

If the water jacket plug had leaked a reasonable amount it could have dribbled backwards and down to end up where you have those traces.

Maybe?

It's a tricky spot to take photos. I just posted in another "Coolant problems" thread in this section. The photo in my post shows where it has tended to run in my case. YMMV.

Originally Posted by bell1975

If the water jacket plug had leaked a reasonable amount it could have dribbled backwards and down to end up where you have those traces.

Maybe?

It's a tricky spot to take photos. I just posted in another "Coolant problems" thread in this section. The photo in my post shows where it has tended to run in my case. YMMV.

If the water jacket plug leak, will it cause overpressurized on the cooling system?

attached another photo from bottom of the exhaust manifold. water jacket plug leaking confirm???

Originally Posted by dearot

If the water jacket plug leak, will it cause overpressurized on the cooling system?

I'm unsure. Perhaps someone will be along later in the day with some additional wisdom.

Originally Posted by dearot

attached another photo from bottom of the exhaust manifold. water jacket plug leaking confirm???

In the attached photo there are 2 small weeps of pink OAT coolant at the hose terminations. If you have similar leaks at these points that may have led to the coolant trickling underneath the manifold from those points.

Originally Posted by bell1975

I'm unsure. Perhaps someone will be along later in the day with some additional wisdom.



In the attached photo there are 2 small weeps of pink OAT coolant at the hose terminations. If you have similar leaks at these points that may have led to the coolant trickling underneath the manifold from those points.

I dont have from the big hose but I do have from the small hose. It looks not much traces on the small hose that why I was wondering whether water jaket leak can cause overpresure on the cooling system in this case the top radiator hose as they are the highest hose.