Fear of running the motor
Back again guys, possibly due to my own demise. I have a noise problem and I'm fearful what it is. The motor has been running great since the head rebuild earlier this year.
It may be just a coincidence, but a few days ago I drove down a road that tidal floods a few inches twice a day. The section that floods is about 20-30 meters. Went through at a steady 10-15mph. Car went through without any issues. Another 20-30meters after exiting the flood as I accelerated away, there was a small hiccup, but nothing that concerned me and as I kept accelerating the engine ran normal all the way home.
The next day, I got into the car, and when starting, it was a little rough. I then drove about 2miles and when it is sitting on idle I could hear a different/extra note from the engine. The rev needle wobbles very slightly, nothing I wouldn't expect from a diesel. I investigated today and the noise sounds like it could be low down inside, when revved it seems to disappear. I jacked the car up and closest I could get to where I think the noise is coming from is the oil sump but I can't be 100%.
My fear which u may be thinking, is the possibility some water got sucked up the air filter (in the 159 this is positioned low down in the front bumper) into the engine causing damage to Pistons, conrod, bearings etc.
I may be over dramatising, but I drive this car every day with a fear of what noises I may hear as there has been a dozen noises Iv delt with since Iv owned it that haven't lead to anything good.
What I need to know, If a small amount of water has entered the engine what damage could be done? Can it survive without a major repair? Car drives fine and noise seems to disappear when driving which confuses me as what Iv read online states that conrod damage when revs increased would get louder. What do I need to do next as I'm stumped with what to do and I'm fearful running the motor with this small noise is only causing more damage? Most information online talks about hydrolock which clearly isn't the case.