Q & A — October 2004
By Capt. Ken Kreisler
| Part 2: A lingering smell, vapor lock, and more.
I have a puzzling
problem with a Rochester four-barrel carburetor. It’s attached to
a 5.6L gasoline engine that starts and runs great. But after a short cruise
at 3200 to 3400 rpm, when I bring the throttle back to idle, the rpm returns
only to 1200 to 1400 rpm. Turning the engine off for a second and then
back on without moving anything else returns it to its normal 750-rpm
idle. Removing the cable does not help, and all linkages are clean and
lubricated and move freely. Do you have any suggestions? C.Q.,
via PMY Maintenance Forum
Because there is the possibility of a gasoline leak, you or your mechanic should address this problem as soon as possible. When doing the inspection, make sure to disconnect your batteries and take other measures to ensure that no spark or other source of ignition is possible.
I have a boat
with a lingering smell coming from the single MSD onboard. I’ve
checked for problems but so far, have not found anything wrong. Any suggestions?
W.V., via e-mail
After a sandy grounding, I noticed one engine running slightly hotter than usual. Back at the dock, when I went to check the impeller on my raw-water pump, I found the lid to be stuck to the pump body. What should I do? L.F., via e-mail
My boat has a pair of 8.1L gas engines. After about two hours of running, the starboard engine started to sputter and eventually quit. Each time it quit I could restart it but had to reduce maximum rpm. Eventually I was able to maintain just 1000 rpm back to port. A cursory inspection of the fuel system showed no blockage or water. The next day, after about three hours of running, the problem cropped up again. Do you have any insight into what could be the problem? K.D., via e-mail
Need help with a maintenance problem? Write to Maintenance Q & A, Power & Motoryacht, 260 Madison Ave., 8th Fl., New York, NY 10016, or log onto the PMY Maintenance Forum. Fax: (917) 256-2282. e-mail: email@example.com. No phone calls, please.
This article originally appeared in the September 2004 issue of Power & Motoryacht magazine.