Hi,
I'm helping a friend troubleshooting his 300X with a overheating/cooling problem.
300X, serial: OT235944
Engine was flushed on the gardenhose before storing for winter with no problems at all.
First startup this spring, engine overheats and horn sound after just 60-90 sec. on the gardenhose.
Impeller changed - OK, thermostats checked - OK, poppet valve checked - OK, but still overheating and the water does not reach the thermostat housing
We removed the LU and attached the gardenhose directly to the water inlet pipe to override the waterpump being the culprit. Still overheating and the water does still not reach the thermostat housing.
But we discovered that water pours out of a hole between the two large exhaust ports (see image below), and if we put a stick against the hole and closes it, water rises to the thermostat housing immediately.
Could it be a blown seal, corrosion in the adaptor plate or ... ?
Can you help me with this problem?
Best regards
Martin
20190421_085503.jpg