Prestige 36 engines

[alun]

Hi All,
just joined the owners network and currently own a Mf925.
Looking to upgrade next year and fancy the prestige 36 2008 model and was wondering if there was a preferred engine size/type.
Thanks 
Alun.

[alun]

Evening All,

Any takers on my previous question as I'm looking at either D4 300's or D6 310's and not sure which will be the preferred engine choice,
love to hear any views or experiences,

Thanks
Alun.

[MalcolmP]

Hi Alun

Sorry you have not had a reply to date.

If you are a Facebook user you might also try on this group, which is Jeanneau Powerboat specific:

www.facebook.com/groups/jeanneau/

[alun]

Thanks MalcolmP I'll try that if I get no replies.

[napoleon]

Hi Alun,

Can only comment on the KAMD300's as have these in my own 36.

Firstly, sorry I was unable to reply earlier but have been away.

The 300 range was the last in a developing range which included the well established 44 series.
Power outputs were gradually increased over several years and culminated in the 300 series which actually produce 285shp.

They are reliable but must be serviced in accordance with the book particularly with tappet adjustment every 200hrs and belt changes every five years. Belts can suffer premature failure due to one of the pulleys being made of cast iron. Without regular use there can be a build up of rust on the normally polished surface of the pulley
giving the effect of sandpaper. This abrades the belt with consequent failure.

The tappets are important as one rocker arm activates two valves. If the tappet clearance changes it is possible for the two active valves to operate at different rates which is very undesirable.

Probably the biggest advantage of the 300 series over the "D" series is the fact that the injection system on the former is the last of the mechanical systems. Well proven and reliable.
The later D engines use a common rail system which is slightly more economical but by definition uses the piezo type injector.

No problem with these except when replacement time comes around. The mechanical injectors are around £100 each and can be reconditioned by any diesel service centre. The latest piezo types are around £500 each with more expensive servicing due to more specialised equipment requirements.

I appreciate you are looking at either D4 or D6 but I thought it worth mentioning the 300 series as you may find a vessel fitted with these motors.

If looking at a D6 vessel I would check the space available for servicing. These larger units restrict the working space and access particularly on the port side. Access to the starting motor and oil/fuel filters can be a pain.

Regardless of which engine choice you make have a look at the position of the primary fuel filters. The port side one is normally placed in an almost impossible place to reach but it can easily be moved further to the right. About 2 - 3 hours work. Well worth it.

Good luck in the search.

Napoleon

[alun]

Thanks very much for your reply Napoleon,very informative and most useful, I have the VP KAMD 300 in my Merryfisher 925,
just wondering have you ever had a overheat problem when running at 3200 rpm,had the boat for 3 1/2 Years with little problem until now and have checked impeller and cooler above gearbox,heat exchanger and exhaust elbow and all seem fine,
thinking of soaking system with rydlyme just to flush out system.
Thanks

Alun.

[napoleon]

Hi Alun,

Only experienced overheat once and that was my fault.
I have an exhaust temperature alarm as well as coolant alarm and in this case the exhaust alarm went off about 30 seconds before the overheat of the coolant alarm.
Good job it did as I was able to shut down in seconds and no damage done.
The cause: A improperly fitted lid to the intake water filter. I had cleaned it before use and not noticed a tiny fold in the sealing ring inside the lid. So the system just sucked air and could not get a flow going.
Only a few seconds to fix but now I am always extra careful to ensure a snug fit before starting up.

Sounds like you are doing all the right things on your overheat problem. Sometimes the impellor blades go a bit soft though continued use and it could be that the blades can't spring back fully in the short time available when running at high speed. Probably not but worth checking.

regards,
Napoleon

[spin]

Hi Alun I have owned a Prestige 36 / 2006 for a year.
Love the boat but it takes some time to learn your way around them. Napoleon is a great help.
Mine has D6 310s they are good but main dealer servicing can be pricey. Volvo oil must have gold dust in it for the price.
The only recognised problem with engines I an aware of was the heat exchanger gasket which was failing and leaking raw water onto the starter motor causing a right mess. Make sure you have both starter motors investigated especially the port side which is difficult to see. Buy a mirror with light on an extending rod to inspect it. Less than a fiver online.
The handbook is next to useless when finding fuses etc. Great if you can get a detailed handover from a practical owner as there is quite a lot to learn about various operations.
Hope this helps. They are great boats and stable even in a 3m swell in the North Sea.
Good hunting!