Engine Failure

[MaltaBob]

Heard today one of the guys on our pontoon had a serious piston failure on a MAN diesel in his 2006 55' Predator this weekend, after not much more than 100hrs, and doubtless very well maintained.The engine room is very oily as the pressure sprayed oil every where!
It does seem to be getting quite common these horror stories, or is it ?? Poor guy!
I don't think I'll moan so much when my next hic up occurs with the 10 yr old P360 which serves us well.

 

[leadersail]

[ QUOTE ]
doubtless very well maintained.

[/ QUOTE ]


It is a real problem with engines still under Warranty.
You can not service your own engines and you are left at the mercy of a 'Professional fleecer'. You have to pay £1000s and unless you stand over the Mechanic you can not be certain anything has been touched.

Before you have a service mark your old filters and ask for them to be placed in a box for you to dispose of.

 

[volvopaul]

common MAN problem v8 and v10 arent that reliable a straight inline engine is much better, you just cant cool a v engine properly they get too hot, more is the point the oil gets too hot and breaks down under high temp, net result crank and pistons overheat, big bang its dead.

 

[oldgit]

Is there ANY sort of runnning in period for a new engine,wondering if a touch to much WOT, for too long,to soon.

 

[omega2]

[ QUOTE ]
Is there ANY sort of runnning in period for a new engine,wondering if a touch to much WOT, for too long,to soon.

[/ QUOTE ]
there used to be with Sabre's and Mermaids, first 20 hours no more than 200 revs under max, which was 2400/500, providing you pull max, and of course the only way to find that out was to max it, strange eh!, if the engine was commercially rated then it was factory run in and you could hammer it from the off. We have been hammering ours for the last twenty years.

 

[Lakesailor]

100 hours in 2 years. Not a lot is it? Boat engines worky pretty hard, unlike road vehicle engines which get to cruise and overrun. If it's all been 1 hour here and 1 hour there I shouldn't think it's ever bedded-in properly.
Motors which aren't bedded-in produce more heat and run rougher. Once I've fired up a rebuilt engine (cars here) I've always tried to do at least an hour or so run at a variety of revs, lighty loaded - don't slog at low revs, dont over-rev - until the motor is thoroughly hot.
Can't see why it should be different for boats. Firing up and ticking over to warm them up is the worst thing. Even with rally engines I would run them at a high idle (3000 rpm) and then set off as soon as the oil was up to temp.

 

[burgundyben]

I think it has a lot to do with the amount of power being squeezed out of the base engine, of course in marine applications they have un limited colling, take most marine engines and you'll find at the high end of output they are a lot more, in some case double the HP of the truck version...

The old sabre's and mermaid 180/210's are pretty bomb proof, but squeeze 300 hp out of the dorset block and they can push their mains out of the caps!

 

[gjgm]

really? You are saying approved dealerships might have an interest in saving a few quid by not replacing a filter on a warranty engine? That sounds very very bizarre.

 

[PowerYachtBlog]

[ QUOTE ]
100 hours in 2 years. Not a lot is it? Boat engines worky pretty hard, unlike road vehicle engines which get to cruise and overrun. If it's all been 1 hour here and 1 hour there I shouldn't think it's ever bedded-in properly.
Motors which aren't bedded-in produce more heat and run rougher. Once I've fired up a rebuilt engine (cars here) I've always tried to do at least an hour or so run at a variety of revs, lighty loaded - don't slog at low revs, dont over-rev - until the motor is thoroughly hot.
Can't see why it should be different for boats. Firing up and ticking over to warm them up is the worst thing. Even with rally engines I would run them at a high idle (3000 rpm) and then set off as soon as the oil was up to temp.

[/ QUOTE ]

this should be written in big on all MY helm stations

also the more bigger the engine the more heating time it takes

 

[Stoaty]

[ QUOTE ]
I think it has a lot to do with the amount of power being squeezed out of the base engine, of course in marine applications they have un limited colling, take most marine engines and you'll find at the high end of output they are a lot more, in some case double the HP of the truck version...[ QUOTE ]


Your right about the amount of horse power but power output falls as the temperature of the air entering the engine rises. It is important on boats that the air they breathe is as cool as possible. Many boats engine rooms are far too hot and this can cause serious engine failures. My engine's manual states that power will decrease by 2.5% for every 1°C over 29.5°C and engine temperature will rise to it's maximum allowed by 49°C. Over 49°C piston / cylinder head failure could happen. My advice is to check your engine room or air intake temperature.

 

[marksaab]

Hi Leadersail

Just curious as to why you/anyone cannot do their own maintainance? If the same rules that apply to cars apply to boats then anyone incl you can do the maintenance as long as genuine parts are used, the car makers tried to force owners to have dealer only servicing with the threat that warranty would be invalid if you didnt. I believe the EU ruled against them?

My cars are always serviced by independents but main dealers do warranty work if required with no problems.

Totally agree about (some) dealers ripping people off, the 1/2 trained monkeys at one marina I used knew nothing, just because they have smart dealer overalls doesnt mean a thing.

 

[omega2]

[ QUOTE ]
I think it has a lot to do with the amount of power being squeezed out of the base engine, of course in marine applications they have un limited colling, take most marine engines and you'll find at the high end of output they are a lot more, in some case double the HP of the truck version...

The old sabre's and mermaid 180/210's are pretty bomb proof, but squeeze 300 hp out of the dorset block and they can push their mains out of the caps!

[/ QUOTE ]
And therebye hangs a tale, who would try to, unless you have unlimited funds to rebuild after every start up. those old girls are there for the long haul not the one G.P race

 

[burgundyben]

exactly, at 5.9 litres, 145 hp and 600 kgs and 2450 flat out each my 6.354 are not gonna wear out in my lifetime....touch wood...