natemoore
Master Chief Petty Officer
- Joined
- Jun 13, 2009
- Messages
- 844
As some of you regulars know, I'm on my second season on a completely rebuilt 470. I'm not having any performance issues. In fact, I'm very pleased with how the engine performs. I used only OEM Quicksilver gaskets and other engine parts when not NLA.
One potentially disconcerting thing I've noticed is that if I top off the coolant tank, it always goes down about a 3/4" from then stays there. Also, every once in awhile, I'll get a ephemeral whiff of coolant when I'm cold cranking the engine.
Ooo that smell. Can't you smell that smell? Ooo that smell. The smell of [coolant being burned up in a combustion chamber] surrounds you.
I'm not immediately suspecting what you're thinking because that coolant smell is coming from inside the engine compartment, not the exhaust, as far as I can tell.
Here is a video of steaming boiling off the engine around the #4 cylinder. It could just be condensation evaporating. And aside from that initial faint, fleeting whiff of hot coolant, the odor goes away quickly. This steam doesn't really have any odor.
One other thing of note. I recently posted about having carbon fouled #3 and #4 plugs. Manual said that it was either sticking valves or bad spark plug wires, or extended periods of idling. Since my wires were very old and cracked, and I to let the engine run mostly at idle for twenty minutes at a time once a week if I don't use it, I replaced them. Got a nice set of Sierra from the iboats store. I'll report back if that fixed the carbon fouling problem.
Okay, would a pressure test of the coolant system be my first step? Should I rent a bore scope and look down into #3 and #4 for signs of coolant? Give me your opinions, guys.
http://www.youtube.com/watch?v=zFRE5tqwY98
One potentially disconcerting thing I've noticed is that if I top off the coolant tank, it always goes down about a 3/4" from then stays there. Also, every once in awhile, I'll get a ephemeral whiff of coolant when I'm cold cranking the engine.
Ooo that smell. Can't you smell that smell? Ooo that smell. The smell of [coolant being burned up in a combustion chamber] surrounds you.
I'm not immediately suspecting what you're thinking because that coolant smell is coming from inside the engine compartment, not the exhaust, as far as I can tell.
Here is a video of steaming boiling off the engine around the #4 cylinder. It could just be condensation evaporating. And aside from that initial faint, fleeting whiff of hot coolant, the odor goes away quickly. This steam doesn't really have any odor.
One other thing of note. I recently posted about having carbon fouled #3 and #4 plugs. Manual said that it was either sticking valves or bad spark plug wires, or extended periods of idling. Since my wires were very old and cracked, and I to let the engine run mostly at idle for twenty minutes at a time once a week if I don't use it, I replaced them. Got a nice set of Sierra from the iboats store. I'll report back if that fixed the carbon fouling problem.
Okay, would a pressure test of the coolant system be my first step? Should I rent a bore scope and look down into #3 and #4 for signs of coolant? Give me your opinions, guys.
http://www.youtube.com/watch?v=zFRE5tqwY98