Q & A — June 2003
By Capt. Ken Kreisler
2: Cool-Running Diesel, and more!
are the problems associated with running a diesel engine at temperatures
cooler than those designated by the manufacturer? S.R., via e-mail
The most common cause of low operating temperature is a faulty thermostat. When you replace it, you may want to flush the cooling system with a product approved by your engine manufacturer to dissolve scale and other contaminants. Your engine service manual will give you the proper procedure for draining, cleaning, and refilling your cooling system.
tender's two-stroke outboard seems to be misfiring, and my dock
buddy said it could be something called four-stroking. I'm getting
a mechanic to look at it, but can you shed any light on this for me?
A.V., via e-mail
While mechanical failure, such as inadequate compression, can cause the engine to misfire at all speeds, it can also cause a cylinder to not fire at idle or low-speed operation. Once midrange and high speeds are reached, normal firing will be apparent. Have your mechanic perform a compression check on the combustion chamber.
Need help with a maintenance problem? Write to Maintenance Q & A, Power & Motoryacht, 260 Madison Ave., 8th Fl., New York, NY 10016. Fax: (917) 256-2282. e-mail: firstname.lastname@example.org. No phone calls, please.
This article originally appeared in the May 2003 issue of Power & Motoryacht magazine.