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WHAT
- Thread starter sawdust
- Start date
One reason for high temps at idle and OK temp at higher RPM is a scored RW pump housing wear surface. If the impeller fails to get a really good seal at low rpm it has a very hard time drawing enough water to cool the engine. You can have a brand new impeller, but if the housing is scored it won't seal or draw properly. At higher RPM . the impeller vanes really don't even need to touch the housing any more to provide sufficient flow as long as the impeller is fully intact.
Another possibility is a loose hose clamp on the suction side of the RW pump that could let air in to aerate the RW flow at low speed when there isn't enough pump suction to overcome the limits of the air leak and draw more water. But any of those issues or a RW flow restriction would tend to increase riser temps at various rpm levels.
Since a Gxi is an apparently RW cooled MPI I/O,I suppose you could possibly have a head or intake gasket leak or maybe even cracked block(?) since you wouldn't smell the non-existant antifreeze or notice it's loss. Those, and possibly bad manifold gaskets, could cause steam with no excess heat in the risers . Did you re-torque the fasteners ( some manifold gaskets don't require that, I believe. )
When you winterized each time, did you run non-tox AF through the whole system after the engine warmed enough to open the thermostat, or just open the drains?
Have you checked spark plugs very recently for any signs of water? If any , suggest performing a compression and leakdown test.
If only the port engine has the gauge anomalies, does that ones exhaust steam a lot more than that of the stbd?
Have you tried a scan to check for codes on the off chance that might provide any add'l clue?
Another possibility is a loose hose clamp on the suction side of the RW pump that could let air in to aerate the RW flow at low speed when there isn't enough pump suction to overcome the limits of the air leak and draw more water. But any of those issues or a RW flow restriction would tend to increase riser temps at various rpm levels.
Since a Gxi is an apparently RW cooled MPI I/O,I suppose you could possibly have a head or intake gasket leak or maybe even cracked block(?) since you wouldn't smell the non-existant antifreeze or notice it's loss. Those, and possibly bad manifold gaskets, could cause steam with no excess heat in the risers . Did you re-torque the fasteners ( some manifold gaskets don't require that, I believe. )
When you winterized each time, did you run non-tox AF through the whole system after the engine warmed enough to open the thermostat, or just open the drains?
Have you checked spark plugs very recently for any signs of water? If any , suggest performing a compression and leakdown test.
If only the port engine has the gauge anomalies, does that ones exhaust steam a lot more than that of the stbd?
Have you tried a scan to check for codes on the off chance that might provide any add'l clue?
- Joined
- Dec 21, 2006
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- 327
I would pull the plugs. Makes sure they are not steam cleaned.
- Joined
- Mar 5, 2001
- RO Number
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- Messages
- 1,800
I'm with oldfishguy, sounds like a possible blown head gasket or cracked cylinder head to me.