melvinmelvin
Member
Failing block-cylinderhead gasket?
The boat has been with the builder for a couple of weeks, sorting out some minor stuff.
Fired up yesterday for the first time in 3 weeks.
As usual the solenoid didn't click when it has not been used for a "long" time. Couple of knocks with a hammer on the bellhouse sorted that.
Fired up very easy. Ran smooth on all 8 (I assume). Revving fine, quick response. Idling fine at about 500, with cold engine. No visible exhaust fumes.
(cold means 30 odd degrees Celsius)
(still have the rather cold NGK sparkplugs, mentioned above, in the mill)
Wanting to test the thermoswitch relays and radiator fans I let it run.
(the water is circulating in the engine all the time, it has no thermostat)
When water temp approached 45-50 degrees Celsius white smoke started to come from one of the 4 exhaust pipes.
(the pipe for cylinders 2 and 4)
Revving offered more white smoke.
Stopped. Let it cool down completely. Repeat start.
The same scenario was repeated. First fine, when warming up --> white smoke.
The only thing I can think of off hand that causes the white smoke would be water leaking into the cylinder(s).
Hence, the smoke being steam rather than smoke.
Any other ideas than gasket failure?
Now. If the cause is gasket failure I don't quite understand why it starts off fine and only offers "smoke" after warmed up.
Would have thought the pressure on the gasket would increase with increasing temperatures.
(hmm, this thread is kind of turning into a blogg, thanks for your patience)
The boat has been with the builder for a couple of weeks, sorting out some minor stuff.
Fired up yesterday for the first time in 3 weeks.
As usual the solenoid didn't click when it has not been used for a "long" time. Couple of knocks with a hammer on the bellhouse sorted that.
Fired up very easy. Ran smooth on all 8 (I assume). Revving fine, quick response. Idling fine at about 500, with cold engine. No visible exhaust fumes.
(cold means 30 odd degrees Celsius)
(still have the rather cold NGK sparkplugs, mentioned above, in the mill)
Wanting to test the thermoswitch relays and radiator fans I let it run.
(the water is circulating in the engine all the time, it has no thermostat)
When water temp approached 45-50 degrees Celsius white smoke started to come from one of the 4 exhaust pipes.
(the pipe for cylinders 2 and 4)
Revving offered more white smoke.
Stopped. Let it cool down completely. Repeat start.
The same scenario was repeated. First fine, when warming up --> white smoke.
The only thing I can think of off hand that causes the white smoke would be water leaking into the cylinder(s).
Hence, the smoke being steam rather than smoke.
Any other ideas than gasket failure?
Now. If the cause is gasket failure I don't quite understand why it starts off fine and only offers "smoke" after warmed up.
Would have thought the pressure on the gasket would increase with increasing temperatures.
(hmm, this thread is kind of turning into a blogg, thanks for your patience)