Hi All, took my boat out for first trip on the lake yesterday. Ran like a top all afternoon (at 2500 and below, including idle). On the way back to the dock I stepped it up to about 3k and felt like there was a little hesitation occasionally. When I powered down it started idling rough. So, I thought I would take one blast around to see if I could clear a possible carb block. I gave it 3/4 throttle right off and all of a sudden got very loud clanking and banging, then stalled and wouldn't start again. I first thought I snapped the timing chain because it had a rattley sound at first. When I got the boat back in my yard it started right up again, but with a lot of clanking and knocking, both at 1500 and idle.
My boat is a 82 Cobalt with a Mercruiser 305.
My question is, since the noise includes a clanky (like something broken) and knock, at both 1500 and idle, does this sound like it may be a bent or broken push rod and possible broken valve spring?
If so, is this a common occurrence or more likely a sign that my 30 yr old engine is not to be trusted anymore?
I really broke the bank last summer getting this new project going. Can't afford to send it back to the mechanic. I have fixed a broken push rod before in my old 69 Doge van so I feel I could tackle that OK.
Appreciate your thoughts.
Dana
My boat is a 82 Cobalt with a Mercruiser 305.
My question is, since the noise includes a clanky (like something broken) and knock, at both 1500 and idle, does this sound like it may be a bent or broken push rod and possible broken valve spring?
If so, is this a common occurrence or more likely a sign that my 30 yr old engine is not to be trusted anymore?
I really broke the bank last summer getting this new project going. Can't afford to send it back to the mechanic. I have fixed a broken push rod before in my old 69 Doge van so I feel I could tackle that OK.
Appreciate your thoughts.
Dana