2004 yanmar 6lp
 

looking into a boat that is powered by a 2004 yanmar 6lp 315 hp diesel engine. it has 400 hours and seems in decent shape. im just wondering if anybody has any experience with these engines as i only know about outboards. any information would be great ;)

Re: 2004 yanmar 6lp
 

Yanmars have a great reputation but apparently there was an issue on these particular engines beacuse they were eating valves, especially if they were not propped correctly. Do a google search and you will see some information out there.

If I were you and was serious about the boat I would make my purchase pending an authorized Yanmar dealer like Mack Boring do 2 things:
- Run the serial numbers of the engine and see if this engine was in the serial number range of the problem engines and if so they should be able to tell you if the valves had been replaced.
- Have them do a complete survey of the engine to include an oil analysis and to make sure the engine is getting up to the rated RPM since a lot of issues were apparently caused by them being over propped and not being able to run up to full RPMs.

Re: 2004 yanmar 6lp
 

Subscribe to boatdiesel.com you can find out anything you want to know.Best $25 to spend for diesel motor info.

Re: 2004 yanmar 6lp
 

Please post the serial nos. great engines, quiet and economical