Volvo 3.0 glp-d Carb and Engine Woes!!!

[seventeen2]

Good afternoon all,
Got a couple of problems, one of which im very worried about!
Volvo Penta 3.0GLP-D (new 2006)
3869304
4012184399
The engine has covered 55 hours from new and is reguarly started, admittedly not a lot of hours covered but the engines keep staling due to carb problems.
I went to fire up the engine today (one of a pair) and found it refused to start, would turn over fine but not fire.
Went through diagnostics i.e fuel, spark etc.
Only found would fire when no 4 spark plug removed?
Removed rocker cover to find the very last valve (closest to the back of engine) has seized in the open position?
The pushrod has bent, but the rocker looks ok? Have tried to lever up valve to no avail also gently tapping has no effect, Im guessing its bent?
I cannot understand why this has happened but am baffled that the engine still turns over ok with o worrying noises?
Are these engines non-interference, i.e would valve and piston meet? Is this a common problem?
I am going to remove the head this weekend to investigate further, but is this safe to do with the boat in the water (its 32 feet and needs to be craned out) with regard to removing the manifold?
Also, im sorry but can anyone assist with the i.d with the carb on this engine?
The numbers are:
6r 3250 b
3863240
75028-3
0496
saej
1223
The reason im asking is that i need to buy a replacement fuel bowl for it but am having difficulty in identifying the correct part.
A lot in one post, but this has all happened in the last week!!
Who would have a boat!!

Kind Regards

Danny

 

[Silvertip]

Re: Volvo 3.0 glp-d Carb and Engine Woes!!!

It is very possible that the engine injested some water which would account for the stuck valve and bent push rod. Water does not compress nor does it burn. Water in a cylinder (from any cause) will very quickly rust things tight, especially if it is salt water. If you couldn't free the valve manually, it is stuck pretty tight and that would account for the bent push rod. As a minimum, that head needs to be pulled and an inspection done on the cylinders.

Carb problems that surface suddenly on a twin engine setup would suggest a fuel issue. Do you use fuel system treatments and are the engines fitted with water separating fuel filters?

 

[seventeen2]

Re: Volvo 3.0 glp-d Carb and Engine Woes!!!

Thanks for the reply,

I am suspecting that his has happened, but would a manifold faile so early?
The boat is in salt water, but is flushed after every use?
Can you tell me if there is a way of checking/testing the manifold whilst the head is off?
I agree with you regarding the fuel problem, but the tank has been completely emptied and cleaned.
I am thinking mixture as when i try to adjust the idle down to spec the engine bogs and stalls.

Kind Regards
Danny

 

[Don S]

Re: Volvo 3.0 glp-d Carb and Engine Woes!!!

I doubt you have manifold or even riser failure due to age or being worn out. More likely crack or even your engine dieseling when you shut it down could do it. Could even be that that side of the boat was too low in the water due to weight on the stern (too many people on the same side etc) It would only take a second if the riser was below the waterline.

 

[seventeen2]

Re: Volvo 3.0 glp-d Carb and Engine Woes!!!

Thanks for the replies,

I am going to strip the head off tomorrow to see if any damage has been done.
Would this be ok to carry out with the boat still in the water?
Is it possible to check out the manifold whilst the head is off?
Sorry for so many questions, but im sick as a parrot....55hrs!!!

Would anybody be able to point me in the right direction regarding the float bowl??


Cheers
Danny

 

[seventeen2]

Re: Volvo 3.0 glp-d Carb and Engine Woes!!!

Good evening all!

Ok so ive removed the cylinder head and have raw water in no 4 cylinder!
The cause of the valve jamming open is corrosion on the valve.
The problem is only on cylinder no4 and thankgod there is no piston damage!!
Remeber guys this engine has only covered 55hrs and fitted brand new in 2006!
Ive looked at the head gasket and cannot see any tell-tale signs for it to fail.
The corrosion seems to be worse on the inlet valve port, i.e the manifold port seems very corroded!
The same port in the manifold is corroded also, im guesing no way should water be here?
Sorry for the ignorance but im refering to the smaller diameter valve (inlet?).
I am leaning toward the manifold at fault, but can anyone tell me if there is any tests i can carry out at home to determine this, or is it possible to have it pressure tested?
I cannot understand for the failre as every winter the block is drained, although i must confess the boat is used in salt water (permanent mooring) and only recently realized the need to flush the system through after use. For about a year it was left with raw water in it...
Any advice given would be greatly appreciated!

Kind Regards

Danny

 

[Bondo]

Re: Volvo 3.0 glp-d Carb and Engine Woes!!!

Ayuh,... Usually the smaller valve is the exhaust, the larger the intake valve...

My guess is, the water came in back through the exhaust...

Yes, the exhaust Manifold can be pressure tested,...
No, the riser can Not be pressure tested...

 

[seventeen2]

Re: Volvo 3.0 glp-d Carb and Engine Woes!!!

Thanks for the reply.

Please could you explain to me how the water can come back through the exhaust, or how i can prevent this from happening?
Am i right in thinking that the exhaust gasses and raw water are "mixed" in the riser?
Sorry for my ignorance, although im ok with mechanics im new in the wet exhaust department!!

Cheers
Dann