Yanmar !!!!!!!!!!!!!!!!!

[NORM]

Can You All That Have The Yanmar Motor In Your C.c. Tell Me If You Have Had Any Go Wrong !!!
Or Do We Have The Lemon Of All Times !!
Thanks ~norm

[Lloyd Malsin]

Yanmar Experiece

Norm, I have an 06 Yanmar 315 25cc. you would not believe what I have been through.First the internal waterpump failed. Major repair.Then at 255 hrs my engine seized. I now have 15 hours on a brand new engine but should add that my dripless also seized requiring major repair after new engine installed. I serviced by the book and even did oil and filters at every 50 hours. I look forward to hearing back from you as your sign off says that 25 yanmar is the way to go.Norm, where are you going and how do you plan on getting back? ha ha Lloyd

[backman]

boatdiesel.com

I encourage you both to join and research the 6LP on boatdiesel.com

I am a volvo owner (twice) but have heard little bad and much good about the Yanmars.

Things I recall

1. maintenance, especially of the zincs was critical
2. There was an exhaust valve failure that ate cylinders 3-4 years back
3. There is a low RPM issue with fouling the injectors or washing oil off the cylinders which as I recall was solved by running up the engines every couple hours.

I have seen the 4LH's abused beyond belief in Panama and keep on ticking.

Water pump -> engine seize -> dripless seize sounds like all 3 bad events came off of one root cause.

[Laukia]

no problems here......

I have twin 6LP-STP's (2005) and have no complaints thus far. I'm going to get the valves adjusted soon and that will be the first time a mechanic has seen my engines. I've been changing the oil and filters at 100 hrs. Zincs every 5 months and coolant once a year. When I'm out of warranty (5 years) I can start buying the cheaper generic Toyota filters. The $25 to get boatdiesel.com is money well spent in my opinion.

[Patriot]

I encourage you both to join and research the 6LP on boatdiesel.com

I am a volvo owner (twice) but have heard little bad and much good about the Yanmars.

Things I recall

1. maintenance, especially of the zincs was critical
2. There was an exhaust valve failure that ate cylinders 3-4 years back
3. There is a low RPM issue with fouling the injectors or washing oil off the cylinders which as I recall was solved by running up the engines every couple hours.

I have seen the 4LH's abused beyond belief in Panama and keep on ticking.

Water pump -> engine seize -> dripless seize sounds like all 3 bad events came off of one root cause.

Larry is right about the three issues he states.

1. Zincs are super critical to the four coolers.
2. Exhaust valve failures due to Yanmar trying to tighten up exhaust valve to guide clearance for emmisions---a little too much.
A. Service Bulletin MSB-02-008 dated Feb 4 2002 applicable until serial number 51201. Valve Seal material change.
B. Service Bulletin MSB-02-049 dated July 3, 2002 changed exhaust valves on engines after serial number 51640.
Both issues are claimed by Yanmar to be caused by overpropping and thus raising upper cylinder temps above design temperatures. The first sign of failure is a tapping/clacking upon rapid decelleration which is indicitive of the valve stem sticking in the guide. I requested pre-purchase on my 2001 CC 28 that the original owner get Yanmar to accomplish both bulletins, he asked, Yanmar did it with Mastry support and so far so good.
3. The Yanmar 300/315 is known to be a slow warmer. Right now in RI waters (42 degrees), I could "warm-up" these engines all day and never get above 100 on the temps. Get underway and put a 1000 rpm load on and they come right up. It is not a thermostat issue as many owners have tried many variations, Yanmar now says to start, get underway and warm up under a light load. That actually works perfect for my 3/4 mile out of no-wake. As an engineer, I will get to the bottom of this "slow warming" issue and suspect it is due to the lube, air and fuel coolers not being regulated by engine thermostats very well. I need to learn more and understand the cooling system better which is quite complicated.

The coolant should be changed yearly now as well, another change to the maintenance schedule. Like many vehicles of the past, 5-8 year or lifetime coolant change advertisements using Dexcool didn't work out very well. Use a good quality antifreeze like Prestone and change yearly.

Bottom line with these engines is to take care of zincs, prop for 4000 WOT and start and go without extended low rpm warm-up. Yanmar also recommends now to "race" the engine prior to shut-down, no definition of what "racing" means in terms of RPMS. As I learn more I will pass it on. These are really good engines but do require some special attention to maintenance.
The torque curve is wonderfully broad and flat, it stays over 550 ft/lbs from 2400-3000. If you lay the torque curve next to other options for these boats and then compare the fuel burn it is easy to see why they are a great match for the 28. http://www.yanmarmarine.com/products...P_TechData.pdf

[Stuart Wade]

I'm a little distressed by this post (especially the refernce to lemons). I owned a volvo 42 series engine in my 25 & just felt the thing was way underpowered. I've ordered a 315hp Yanmar to repower my boat feeling this engine was more than enough hp to adequately push the hull through the water. The only other engine I considered was the D4 260hp volvo. A friend of mine has a 315 Yanmar in his 29' Dyer & raves about his experience with the thing. In addition, I asked Carlton & Doug Layton in Edenton which engine they'd recommend & their reply was the Yanmar. Hope I hven't made a $20,000+ mistake. Regardless, I'll take the maintenance recommendations above to heart when I pick my repowered boat up next month.

Stuart

[Patriot]

Stuart-

Not to worry you went the right route IMO. The Service bulletins I mention are N/A to your new motor, they have all been upgraded. I think for a 25 CC you have the ultimate power now. Too many people who buy diesels don't take care of them and no matter what anyone tells you a modern diesel needs far more maintenance than a modern gas engine. Feed it clean fuel, ensure she is propped to get to 4000 rpms at WOT, follow the maintenance manual by the book and cruise her anywhere up to 3400 or so and you will get many years of enjoyment from your decision. As you poke around various web sites you begin to notice that not many people post that they love their engine yet there are many thousands of Yanmar 6LP motors out there. You will find random issues with any brand of power from outboards to diesels and typically those complaints mean so little on a statistical basis they almost need to be considered anomolies. A "lemon" would be a first generation DFI outboard. The Ficht fiasco that put OMC out of business and still hurts the Evinrude name to this day for those trying to sell boats with them yet I ran an original Ficht engine for 7 years/2000 hours and it never went to a dealer or mechanic.... go figure.

[Little Dandy]

Stuart,
Is your boat straight shaft or jackshaft/outdrive?

[Hey Doc]

25 Jackshaft

Stuart,
Is your 25 yanmar repower going to coupled to a mercruiser outdrive? Or is the boat an inboard. I never had any problems with my yanmars, but I was not so fortunate with the mercruiser outdrives they were paired with.

[Stuart Wade]

Mike & Hey Doc:

In addition to purchasing a new Yanmar, I'm also buying a new volvo duoprop outdrive. There was nothing wrong with the incumbent outdrive other than it was old. Doug Layton told me that there may be another season in the thing or it may break 5 hours from now. I just decided since I had the boat in Edenton for the re-power why not go ahead & install a new drive also?

Patriot:

Thanks for your words of encouragement. I put a lot of stock in what the Layton's tell me to do about this boat & they could sell me either a Yanmar or a Volvo & I went with the Yanmar in part due to the higher horsepower but largely because they had such a belief in Yanmar. After reading Norm's & Lloyd's posts, I guess an element of doubt crept in on me.

Stuart

[Hey Doc]

Yanmar

Stuart,
You will likely be pleased with the Yanmar Volvo package. As long as you don't have to couple the engine to a Mercruiser Bravo drive, you should have very little trouble.

[NORM]

Yanmar !!!!!!!!!!!!!!!!!!!!

Thanks to all of you for the help ???? We had a 2000~25 c.c. / yanmar 300 hp. RAN good all the time ! till it started smokin, we pulled the head & did a valve job, tossed the valves , they were pitted so bad we could not use them agan ..
When Mac CAME UP WITH THE INBOARD we ask him to build one for us,we all looked for a good motor for the new c.c./// but the yanmar was the only one that will fit in that 25'....
So we ran the new c.c. & when we hit 65 hours the fuel pump went bad/ one day bfore a tunajackpot !!!! YES WE LOST ALL THE $$$$$$ ~ FOR THE ENTRY +++ SIDE POT !!
So the west coast yanmar dealer put on a new pump,we ran up to 220- hours, the back of the boat is all black with smoke ???? WE HAD TO WASH EVERE DAY !!!! THE C.C. IS BACK AT THE DEALER AGAN !!!!!!!! WE ARE LOOKING FOR HELP TO GET YANMAR TO HELP US FOR LOST TIME , LOST USE OF THE BOAT ?????? HOPE TO HAVE MORE WARRENTY FOR LOST TIME ???
We only get 3700 rpm , using the prop that mac made for this set up....I HAVE A TRUCKING OUTFIT & KNOW HOW TO TAKE CARE OF ANY THING THAT COMES UP, BUT WHEN THINKS LIKE THIS HAPPEN YOU CAN'T DO ANY WORK YOUR SELF !!!! So here we are, wating for news, will have to travel 8 hours to the dealer & back just to bring the c.c. home .. We love the boat , we know Mac, he is trying to help~~ but ????? IS THERE SOME ONE AT YANMAR WE SHOULD TALK TO ????

Thanks for your time ~~Norm

PS .. I may have to change my signature ??

[Laukia]

start here and work back.......

"We only get 3700 rpm"

That my friend is the problem. I get 3950 at WOT and negligible smoking. Have you added a lot of weight to the boat? Where on the West Coast are you located?

[Patriot]

"We only get 3700 rpm"

The engine should be propped to reach 4000 RPMs. You have too much pitch. A dealer should never let that boat go out only turning 3700.

Pitch for 4000 rpms at WOT with a full load of fuel and normal gear onboard. Fast cruise her right up to 3400 if you want and she will run for years.

[NORM]

yanmar !!!!!!!!!

MORE INFO ... The motor also blew oil out & made a mess ,!!! The oil came from the breather..
We live in auburn ca,the c.c. is at the westcoast yanmar dist in southland ca.So we have a 7-8 hour drive one way..
When we took the c.c. in this time , they said that yes ?????? We will do a comp test + test the oil , to see if there is any fuel in the oil...
When we picked up the c.c. at towen creek in N.C..We did 45 hours of running by the book,never did we get 4000 rpm from this set up ????? WHEN WE WERE AT THE FACTORY , I ASK MAC ABOUT THE PROP , HE SAID THAT THEY DID A LOT OF TESTING FOR THE INBOARD PROP + IT COST $700.00 & WE HAVE TWO OF THEM !!!!!
If & when we hear from yanmar we will let every one know !!!!

NOW MORE INFO ~~This came in the mail this week ~~~~THERE IS A CLASSACTION SUIT FOR YANMAR ~~~ THIS IS FOR THE 6LP-STE RANGE OF MOTORS ~ FROM 1996-2002....SEAIAL ##50101-53988/M50001-51195//
THIS IS THE MOTOR THAT WE DID ALL THE WORK TO JUST BEFOR WE TRADE THE 2000 IN... Not to shur how to work with this / but we will try....
Just wanted to ask if any one has seen this ?????

Thats all for now / THE 25' WITH THE INBOARD ~~ IS YOUR PROP THE SAME as mine ?????????
sea you~~ NORM