Portage_Bay
Guru
- Joined
- Oct 19, 2015
- Messages
- 2,658
- Location
- United States
- Vessel Name
- Pacific Myst
- Vessel Make
- West Bay 4500
I've got the core bundles cleaned up and ready to reassemble.
1 - Should I use any sealant on the gaskets? The last person seems to have assembled them dry. There was some leaking. However I´m concerned that if I use sealant the bundle core will be near impossible to get out in future.
2 - What lube for the O-rings?
3 - Core bundle alignment. When removing the end cap with the O-ring I noticed on both engines the end of the bundle was not concentric with the tube. There is no play in the assembly when the bundle is all the way in. I can think of a couple of work-arounds. Remove some material on the bundle´s (for lack of a better term) internal brackets. Or. Carefully fit the end cap and O-ring then force the end cap holes to line up with the tube holes. The reason for the concern in alignment is two fold. On one engine the previous installer had just pushed the end cap over the bundle slicing the O-ring.
4 - Corrosion, pitting. On the engine with the damaged O-ring there is some pitting at the bottom of the tube. Because that should only see coolant it concerns me the damaged O-ring was allowing coolant and sea water to mix causing the pitting. Unknown, and just speculation. These engines are 1983 vintage with about 4000 hrs on them
Some 3208s have plastic end caps on the heat exchanger. These engines have cast metal caps. Probably bronze.
1 - Should I use any sealant on the gaskets? The last person seems to have assembled them dry. There was some leaking. However I´m concerned that if I use sealant the bundle core will be near impossible to get out in future.
2 - What lube for the O-rings?
3 - Core bundle alignment. When removing the end cap with the O-ring I noticed on both engines the end of the bundle was not concentric with the tube. There is no play in the assembly when the bundle is all the way in. I can think of a couple of work-arounds. Remove some material on the bundle´s (for lack of a better term) internal brackets. Or. Carefully fit the end cap and O-ring then force the end cap holes to line up with the tube holes. The reason for the concern in alignment is two fold. On one engine the previous installer had just pushed the end cap over the bundle slicing the O-ring.
4 - Corrosion, pitting. On the engine with the damaged O-ring there is some pitting at the bottom of the tube. Because that should only see coolant it concerns me the damaged O-ring was allowing coolant and sea water to mix causing the pitting. Unknown, and just speculation. These engines are 1983 vintage with about 4000 hrs on them
Some 3208s have plastic end caps on the heat exchanger. These engines have cast metal caps. Probably bronze.