One MAN engine fails on last day end last trip of our summer holliday’s

AndieMac said:
It just seemed to want to find that certain operating level, about 30mm below the brim. Of course if the level keeps falling and there's nothing in the bilge space, check the heat exchanger.
Click to expand...

the rebuild engine (SB) had a cooling water operating level about 30mm below the brim,
which seems to be the normal mode.

but the port engine , the coolling water level dropped until just below alarm level ( alarm light goes ON)
it does this only at planing speed after a while, (20kn 2000 rpm)
it doesn't do this during pootling speed (10kn 1000rpm)
and the strange thing is, it doesnt go lower than just below alarm level,

in one occasion I forgot about this, and have been sailing for many hours at planing speed from the upstairs helm, with the alarm light "on" (lower helm)
but I alway's pay attention to the engine temp, and that was alway's ok (83...87°C)
even then, the cooling water level didn't go lower than just below the alarm level,

as if there is a pressure build up in the cooling cirquit, when turbo is giving power (???)
I have been checking the overpressure drain hose near the filling plug, during planing speed, but this remained dry

I discussed this only briefly with MAN man, (yet)
he mentioned a leak in a cylinder head gasket or in the turbo...
 
BartW said:
the rebuild engine (SB) had a cooling water operating level about 30mm below the brim,
which seems to be the normal mode.

but the port engine , the coolling water level dropped until just below alarm level ( alarm light goes ON)
it does this only at planing speed after a while, (20kn 2000 rpm)
it doesn't do this during pootling speed (10kn 1000rpm)
and the strange thing is, it doesnt go lower than just below alarm level,

in one occasion I forgot about this, and have been sailing for many hours at planing speed from the upstairs helm, with the alarm light "on" (lower helm)
but I alway's pay attention to the engine temp, and that was alway's ok (83...87°C)
even then, the cooling water level didn't go lower than just below the alarm level,

as if there is a pressure build up in the cooling cirquit, when turbo is giving power (???)
I have been checking the overpressure drain hose near the filling plug, during planing speed, but this remained dry

I discussed this only briefly with MAN man, (yet)
he mentioned a leak in a cylinder head gasket or in the turbo...
Click to expand...

Come to think about it, the alarm would sometimes come on in rough water conditions, but as you say with yours, the level seemed to hover just around the alarm level.
To eliminate a less than perfect seal of the radiator cap, can you attach a small plastic juice bottle to the discharge end (engine sump area) of the by-pass pipe, just to make sure nothing is getting out over a longer period at cruise revs? Assuming of course you don't have an expansion (factory white plastic) tank attached to it.
 
Last edited:
kashurst said:
thats sounds lovely - good luck putting it all back in.
Click to expand...

thanks,
how are you getting on with the D9 diagnostic?
as far as I remember you were not yet completely sure about the real problem?
you must be nervous quite short for the season ? I know the feeling, had a similar occasion with a D3
good luck !
 
AndieMac said:
To eliminate a less than perfect seal of the radiator cap, can you attach a small plastic juice bottle to the discharge end (engine sump area) of the by-pass pipe, just to make sure nothing is getting out over a longer period at cruise revs? Assuming of course you don't have an expansion (factory white plastic) tank attached to it.
Click to expand...

I have already swapped radiator caps, and monitord the discharge end,
we are quite sure that the water escapes somewhere in the engine, or turbo's,
MAN man is going to do some tests, but as engine has been running like this for at least one long season, we are going to do only a minimal service atm,
and complete overhaul after the season,
new engine runs so sweet that I'm tempted now for the other engine to do the same, (less complex, no new engineblok)
there is no expansion tank


newly looking engine is now in the boat,
and the Guy's will continue the installation and in boat tests the coming day's.
will post pics from the lift in soon
sea trial is sceduled on 1th June, I have other commitments from tomorrow until june
 
BartW said:
new engine runs so sweet that I'm tempted now for the other engine to do the same, (less complex, no new engineblok)
Click to expand...

I reckon many of us thought that this was going to be the case, it will always be on your mind while the engines are running :)

Good luck with the sea trials Bart, please post up some pics!
 
as can be seen on the pics, they took off the exhaust manifolds, en the turbo's, for making the engine smaller:

i-KdHn2qp-L.jpg


i-prXZC3z-L.jpg


i-9gg65wP-L.jpg


more pics on Elly's Phone, will come later
 
Last edited:
BartW said:
new engine runs so sweet that I'm tempted now for the other engine to do the same, (less complex, no new engineblok)
there is no expansion tank
Click to expand...

I think thats a good plan, Bart. After you do the other engine, BA will be good for another 25yrs or more. Maybe even last longer than you:D
 
25 years?!? Pah! I'm sure that BA (and also her owner, of course!) will be around for much longer, with this sort of TLC! :D
 
delightfull update;

today we had some tests with the engines in the boat and sea trial,
and both engines performed good,
they ran for quite a while at idle to 1200 RPM,
and later slowly up to 1500 and even 2000 RPM.
all temperatures and oil pressures, etc. were OK.

we only got 16,5kn at 2000 rpm, (normal is 20kn/2000rpm) but the hull is terribly fouled, (didn't sail for 8 months)
tomorrow she will go to the yard for liftout and antifouling,
at the end of the week we'll do some more tests.

so it looks that Ilko and his team, did a very good job.
the delay's at the end were a bit worying, but nevertheless the Guy's know their stuff.


there are still a few tweeks to do, but nothing really worrying;
things such as:
- the throttles are in a quite different position for same RPM
- RPM counter signal on new engine needs fixing
- need to check play in shaft bearing (tomorrow in the yard)

the old engine, performs as before,
more smoke then the new engine,
and there is some cooling water consumption, Ilko will next week disassemble and check some parts, ao, exhaust manifold, turbo and heat exchangers, and compression test, etc...
He wil also replace the nozles of the injectors.

rebuild of pistons and liners will be planned for after the season.

So, it seams that we are getting ready for the season. :D
 
BartW said:
delightfull update;

today we had some tests with the engines in the boat and sea trial,
and both engines performed good,
they ran for quite a while at idle to 1200 RPM,
and later slowly up to 1500 and even 2000 RPM.
all temperatures and oil pressures, etc. were OK.

we only got 16,5kn at 2000 rpm, (normal is 20kn/2000rpm) but the hull is terribly fouled, (didn't sail for 8 months)
tomorrow she will go to the yard for liftout and antifouling,
at the end of the week we'll do some more tests.

so it looks that Ilko and his team, did a very good job.
the delay's at the end were a bit worying, but nevertheless the Guy's know their stuff.


there are still a few tweeks to do, but nothing really worrying;
things such as:
- the throttles are in a quite different position for same RPM
- RPM counter signal on new engine needs fixing
- need to check play in shaft bearing (tomorrow in the yard)

the old engine, performs as before,
more smoke then the new engine,
and there is some cooling water consumption, Ilko will next week disassemble and check some parts, ao, exhaust manifold, turbo and heat exchangers, and compression test, etc...
He wil also replace the nozles of the injectors.

rebuild of pistons and liners will be planned for after the season.

So, it seams that we are getting ready for the season. :D
Click to expand...

This sounds really positive - I am delighted for you! :D
 
You must log in or register to reply here.

Other threads that may be of interest

B
How does a tacho get RPM and engine-hours data, and how to fix faulty readings?
Replies
17
Views
586
Centurion11
C

Share this page

Top