On Saturday morning I did the following:
1) Capped off the thermostat bypass
2) Performed the acid bath
2a) For the first 10 gallons the water was BLACK. After running another 2.5 gallons I started to backwash the engine.
Here is an image of the water
https://drive.google.com/open?id=1-c...Vd6VIpFw0NEGRm
2b) I backwashed about 20 gallons of fresh water through the engine until the water was coming out was clear on the water pump end.
2c) After that I flushed out the exhaust line
2d) Ran the engine for an hour with raw salt water and she ran clean and cool with a lot of water coming out the back. Made me very happy.
Here is a video I took
https://drive.google.com/open?id=1uk...aDUctLJU1OywIn
3) Checked the impeller and pump, they seemed to work perfectly.
On Sunday a buddy and I decided to do a 5-6 hour sail through the Santa Monica Bay. The engine started right up and was pumping a lot of water (like Saturday). After warming her up for about 10-15 mins we headed out the slip. We motored around the marina for about 15-20 mins to test out the engine, everything seemed fine. We raised the sails and began to sail around the bay.
About 5 hours later and about 15-20 mins from the breakwater to the marina I decided to turn on the atomic 4 while going about 4.5-5 knots with low swells and with the heeling of the boat on the thru-hull side. I kept the engine in neutral with the lowest amount of RPMS (throttle). I wasn't seeing a lot of water coming out of the exhaust but thought it might have been an illusion from the swell. I kept my eye on it and then right before we hit the breakwater (about 20 mins after starting) I could hear the engine struggling so I turn off the engine. Opened the compartment, and there was some white smoke coming from the oil cap area. Without a doubt overheating again. After sailing for about 30 mins to my basin. Kicked the engine over to get us into the slip and she turned right over with the same water flow I had Saturday and that morning. After getting into the slip I kept the engine running and she was running a lot more even and cool.
I decided to turn off the engine to investigate. While looking around I noticed that my thru-hull comes to a T right after the valve. The line not running to the water pump runs to another valve then up to my deck where I can attach a hose to clear out the exhaust (I'm a dummy and didn't realize what that was while doing the acid bath). Once I found it I attached my hose and cleared out my exhaust line, why not right. But when doing that I realized that valve was open. Could this valve being open cause the pump not to get enough pressure to suck in enough water for the engine while under sail and moving 4.5-5 knots?
Here is a video of my thru-hull set up (black hose runs to the water pump and the clear runs to the fresh water hose line with the valve closed)
https://drive.google.com/open?id=1h3...l6w1tAYX91ZP2G
SIDE QUESTION: Does anyone know what that other thru-hull is with the white hose?
Here is the engine running at different RPMs with the valve closed after washing the exhaust out
https://drive.google.com/open?id=16z...FobY9AMhiviH3f
Could that valve being open be the issue of the overheating in the bay? I am a little perplexed by this situation. Runs great in the marina, has a tough time running in the bay while sailing.
Let me know what you think! Making a lot of rookie mistakes
going to learn from them.