Due to corrosion, I've just replaced my thermostat housing and the new item has given me a few new bungs for accessories.
I'm having difficulty getting my head around the water flow in a marine engine when the thermostat is both closed (cold engine) & open (hot engine).
I wish to fit a 3/8" cooling tell-tale (aka 'pisser') and want to know whether I should fit it to the:
Top (red arrow) bung - Straight from the raw water pump/ pisses cold water.
Bottom (red arrow) bung - Large diameter hose to circulating pump seems pressurized when the 'stat is closed & I'm wondering if this section is sealed during warm up? Bottom bung is ideal, as this will discharge true engine temp (160f).
Green arrow bung shares the same area as above & my engine alarm is in there.
How does the bypass passage work & does any raw water (from the pump) go through the block (to replenish wasted 'pisser' water) during warm up ('stat closed)? I'd hate to have the pisser plumbed to this bung & the circulating pump runs dry...
I hope I'm not rambling & making some sense?!
I'm having difficulty getting my head around the water flow in a marine engine when the thermostat is both closed (cold engine) & open (hot engine).
I wish to fit a 3/8" cooling tell-tale (aka 'pisser') and want to know whether I should fit it to the:
Top (red arrow) bung - Straight from the raw water pump/ pisses cold water.
Bottom (red arrow) bung - Large diameter hose to circulating pump seems pressurized when the 'stat is closed & I'm wondering if this section is sealed during warm up? Bottom bung is ideal, as this will discharge true engine temp (160f).
Green arrow bung shares the same area as above & my engine alarm is in there.
How does the bypass passage work & does any raw water (from the pump) go through the block (to replenish wasted 'pisser' water) during warm up ('stat closed)? I'd hate to have the pisser plumbed to this bung & the circulating pump runs dry...
I hope I'm not rambling & making some sense?!