Hi, I am new to sailing and I am looking for some advice. I have a 50% share in a 25ft yacht (1978).
The original (inboard) yanmar 8hp diesel engine is only able to propel the boat at about 0.5 knots. We got the boat in February and at first we could do 4 - 5 knots under power no problem.
Today we struggled for 20 minutes to beat a 14mph wind to get back on to our mooring. We were getting blown backwards (slowly) at one point!
There is also a fair bit of white smoke after about 10 minutes of running the engine. We have discovered about 10% water in the fuel filter. Would water in fuel cause the boat to run at 0.5 knots?
Other checks we have done so far:
* oil seems ok, it's black - no milky residue.
* raw water inlet not blocked
* water coming from raw water exit (although not lots)
I am hoping to rule out a problem with the cylinder head gasket Is it possible that our problem could be caused by water in the fuel?
Your thoughts please?