Rod Holder
Petty Officer 3rd Class
- Joined
- Jan 17, 2002
- Messages
- 98
Hi,
I have a 470 Merc which I rebuilt and now has around 50 hrs on it. This year I have noticed that the coolant level in the reservoir has been dropping. I have been topping it off but after returning from my last trip out, I checked the level by removing the rad cap and it was dry. I added a full gallon !! and walked behind the boat to see coolant dripping from the outdrive (engine not running)...Ugghhh.
I removed the riser and yes there is evidence that the gasket has hardened and antifreeze has been going thru riser (chunks of gritty stuff that smelled like antifreeze) but does not explain how coolant would make it to the outdrive with the engine not running as the exhaust manifold was completly free of any coolant in the exhaust passage. BTW, I use the solid fiber blocker style gasket betweeh riser and manifold.
Is this a heat exchanger issue ??
I have a 470 Merc which I rebuilt and now has around 50 hrs on it. This year I have noticed that the coolant level in the reservoir has been dropping. I have been topping it off but after returning from my last trip out, I checked the level by removing the rad cap and it was dry. I added a full gallon !! and walked behind the boat to see coolant dripping from the outdrive (engine not running)...Ugghhh.
I removed the riser and yes there is evidence that the gasket has hardened and antifreeze has been going thru riser (chunks of gritty stuff that smelled like antifreeze) but does not explain how coolant would make it to the outdrive with the engine not running as the exhaust manifold was completly free of any coolant in the exhaust passage. BTW, I use the solid fiber blocker style gasket betweeh riser and manifold.
Is this a heat exchanger issue ??