My exhaust sound has changed, sounds like air is being expelled with the water and exhaust gases, the noise is loud.
Sequence of events: when this exhaust noise started , on looking around I found a leak on the water lifter on the exhaust. My mechanic repaired the leak. The noise went away briefly and later on reappeared. My mechanic removed the cylinder head,(because of the exhaust noise) found the cylinder head gasket in disrepair and a tiny hole in the cylinder head.
The cylinder head was replaced with an used one from Moyer, plus the gastket and struts. My mechanic told me the engine was still not working well and needed all valve replaced, he believes that intake valve in cylinder 3, and exhaust valve in cylinder 4 are faulty.
Today I went to check the boat, starts great and runs smoothly, with not much power, as it has been now for some time. The noise in the exhaust was still there. Suddenly it was gone and remained gone for some time, when the engine is turned on again, the strange (and loud) sound in the exhaust is again present.
Current conclusions: the exhaust noise is not related to the engine itself, a friend suggestion: it has to be related to something before the water pump, (air been sucked in)a hole in a hose or something in the water intake in the hull.
The lack of engine power, could be a couple of faulty valves as suggested by my mechanic.
Additional: I wonder what cylinder is working or not. With the engine running if I unplug the cable to cylinder 1, keeps running unchanged, also if I remove the wire to cylinder 3, have not tried on the other two cylinder.
Questions:
1) what is cause of this exhaust noise or how to find its source.
2) how to find out if the valves are not working well.
Sequence of events: when this exhaust noise started , on looking around I found a leak on the water lifter on the exhaust. My mechanic repaired the leak. The noise went away briefly and later on reappeared. My mechanic removed the cylinder head,(because of the exhaust noise) found the cylinder head gasket in disrepair and a tiny hole in the cylinder head.
The cylinder head was replaced with an used one from Moyer, plus the gastket and struts. My mechanic told me the engine was still not working well and needed all valve replaced, he believes that intake valve in cylinder 3, and exhaust valve in cylinder 4 are faulty.
Today I went to check the boat, starts great and runs smoothly, with not much power, as it has been now for some time. The noise in the exhaust was still there. Suddenly it was gone and remained gone for some time, when the engine is turned on again, the strange (and loud) sound in the exhaust is again present.
Current conclusions: the exhaust noise is not related to the engine itself, a friend suggestion: it has to be related to something before the water pump, (air been sucked in)a hole in a hose or something in the water intake in the hull.
The lack of engine power, could be a couple of faulty valves as suggested by my mechanic.
Additional: I wonder what cylinder is working or not. With the engine running if I unplug the cable to cylinder 1, keeps running unchanged, also if I remove the wire to cylinder 3, have not tried on the other two cylinder.
Questions:
1) what is cause of this exhaust noise or how to find its source.
2) how to find out if the valves are not working well.
Comment