Water U Lookin' At
Member
All,
Just had a failure this weekend on my IAC (controls engine idle speed/start up air mixture). This part is about $90 and is very easily replaced in 2 minutes. The reason I'm posting this is that I feel you should have one of these, and the gasket that goes with it (doesn't come with the IAC), onboard, because if it goes, you're dead in the water.
Symptom was that we were steaming for about 1 1/2 hours on the bay and then slowed down to idle in the Baltimore Harbor. At that point, the starboard engine died. It wouldn't start after that. The engine would crank, but not start.
If you have Smartcraft installed, it will tell you exactly what's wrong. I don't have Smartcraft in my boat, so a tech from Clark's Landing Sea Ray came to Baltimore and hooked his computer to my engine, read the code, and replaced the IAC and gasket in 2 minutes. He said it's a common failure. So, I ordered an extra IAC and gasket just in case the port engine decides to do the same thing in the near future. The IAC sits on top of the engine, right after the flame arrestor. It's held in place by 2 hex bolts, and requires a new gasket that's sold separately when it's replaced. I've added a link to the schematic for the throttle body which shows the IAC and gasket (parts 15 and 16).
http://www.marinepartsexpress.com/Merc_Schematics/5.0L%20MPI%20ALPHA-BRAVO/0M300000_0M599999%20(USA)/THROTTLE%20BODY.pdf
Happy boating!!
Eddie
Just had a failure this weekend on my IAC (controls engine idle speed/start up air mixture). This part is about $90 and is very easily replaced in 2 minutes. The reason I'm posting this is that I feel you should have one of these, and the gasket that goes with it (doesn't come with the IAC), onboard, because if it goes, you're dead in the water.
Symptom was that we were steaming for about 1 1/2 hours on the bay and then slowed down to idle in the Baltimore Harbor. At that point, the starboard engine died. It wouldn't start after that. The engine would crank, but not start.
If you have Smartcraft installed, it will tell you exactly what's wrong. I don't have Smartcraft in my boat, so a tech from Clark's Landing Sea Ray came to Baltimore and hooked his computer to my engine, read the code, and replaced the IAC and gasket in 2 minutes. He said it's a common failure. So, I ordered an extra IAC and gasket just in case the port engine decides to do the same thing in the near future. The IAC sits on top of the engine, right after the flame arrestor. It's held in place by 2 hex bolts, and requires a new gasket that's sold separately when it's replaced. I've added a link to the schematic for the throttle body which shows the IAC and gasket (parts 15 and 16).
http://www.marinepartsexpress.com/Merc_Schematics/5.0L%20MPI%20ALPHA-BRAVO/0M300000_0M599999%20(USA)/THROTTLE%20BODY.pdf
Happy boating!!
Eddie