mrsrobinson
Well-Known Member
What Mr. Webster is saying for a baselining process is precisely what you should do.
What I'm saying is as your boat got through sea trials without an overheating issue then subsequently you got into a situation that filled the raw water passages with silt and mud you should inspect and flush everything, including the exhaust diffuser (shower heat). This is why I'm recommending as the easiest path to get back on the water to flush the diffuser.
The process is:
Here is your checklist to verify the raw water flow is unobstructed -
- Remove the exhaust hose from the diffuser/riser.
- Install suitable protection to prevent water from entering the exhaust path and consequently getting to the turbocharger turbine. I would pack a towel in there tightly.
- Remove the hose between the raw water inlet fitting on the bottom of the riser.
- With a hose and spray nozzle spray water at high velocity into the diffuser ports allowing any debris to exit from that low port the hose was connected.
None of these steps are difficult or time consuming.
- Verify intake grating and ports under the boat are clean and open
- Verify the through hull valve through the strainer, fuel cooler, and hoses to the raw water pump are clean of any obstructions.
- Verify the raw water pump is in correct working order and free of air leak (new impeller, gasket, and key as a minimum).
- Verify / clean engine heat exchanger. All tubes should readily flow fresh water.
- Verify the hoses and piping between heat exchanger and gear cooler are clean and unobstructed.
- Verify the gear cooler is clean and free of any plugged tubes. BTW when an engine is showing signs of higher operating temperature the gear cooler is the first place to look as it doesn't take much to inhibit it's flow.
- Verify the hose between the gear cooler and exhaust riser is free flowing and clear.
- Inspect and clean the exhaust riser water passages and diffuser (shower heat)
Perfect, thank you.
Slightly off topic, I did buy a endoscope camera to see how much value it will add "looking up and into a hose" before taking something apart. That is not my plan, it's more out of curiosity and for futures uses as well. I also thought this could come in handy during a trip/on the water before one starts to tear things apart. Take a quick look/see with the camera first.
https://www.amazon.com/dp/B01MYTHWK4?psc=1&ref=ppx_yo2ov_dt_b_product_details