View Full Version : Loosing cooling liquid

05-04-2008, 05:09 AM
Hi there,

We are running a MC X2, 2008 at our wakeboarding school in El Gouna, Egypt and we have a problem that we are not able to fix ourselves and would like to see if anybody else has had a similar experience.
We have a saltwater series with 700 hrs on the counter and we have had a problem with re-filling colling liquid since we bought the boat. Now to fill a little every now and then is doable but lately it became 4 liters per day so we decided it was time to take action.

We have checked the following,
Impeller, was ok but changed anyway (ok)
All hoses and connections (ok)
Intercooler, pressure tested (ok)
Transmission oil cooler (ok)
Thermostat, changed (ok)
Cylinder head gaskets, changed (ok)

After changing the head gaskets we have the boat back in the water with a 142 F thermostat and the temperature stays between 142 when driving and 160 at idle but again we are still loosing cooling liquid about one expansion tank on a days work (1 liter a day 8 hours).

Has anybody a solution to this problem?

Looking forward to your replies.

Thanks and regards,

Marcel and Wouter

05-04-2008, 09:22 AM
Are you seeing any coolant in the bilge? If not the leak is likely internal. Since you've changed head gaskets, ruled out the intercooler and transmission cooler, you may need to start looking for a crack in the block or one of the heads. How does the oil look? That would give a clue if coolant could be seen mixed in with the oil. If a crack goes into one of the cylinders and the coolant is going out with the exhaust, a cylinder leakdown test would help to spot the problem.

I'm sure others will be along to make further suggestions.

05-04-2008, 11:12 AM
There is no coolant in the bilge nor is there in the oil.

Engine Nut
05-04-2008, 11:15 AM

Take a look at the PM that I sent you.

05-06-2008, 04:41 PM
Ok everybody, the problem is found. There is a hole in one of the exhaust manifolds. We have pressure tested the exhaust manifold and as these are also cooled by coolant there was a hole. We have ordered a new one and hope to continue our operation without problems.