Volvo Penta 5.0 GL-B does not go properly

[Danmarine]

I tried again.

Cleaned all cables for battery and all cables for ground, sanded with sandpaper and cleaned.
Then I tried to check the plus (+) cable for coil - immediately think a high resistance could be measured. So I disassembled this and made a direct connection to the coil, from the battery plus (+). It could now be done to get a spark out of the center cable to the distributor! NICE

Therefore changed all ignition cables to original new ones. Check for spark at spark plugs - yes it is there now too!

But unfortunately still no start.
Then tried to change the starter as it was quite dull (even though it was brand new). Mounted a new original starter and the engine could then spin at proper speed.

Still no start ...

Tried to check spark again, it's super nice now.
Tried to put the ignition tools on and follow the ignition - it looks fine.

May try later, where I replace spark plugs with new ones (the current ones are otherwise also new), and give it something more to live on, possibly with a little starter fluid.

Otherwise I'm afraid something is completely wrong inside the engine?

 

[jworth21]

I'm thinking you know if there was something seriously wrong inside the motor. Easy enough to do a compression test though.

 

[Danmarine]

New spark plugs helped - strangely enough, when the others were also new?
But the engine shot a little and began to give signs of life.
Tried a compression test once again and it stays within the limit, maybe eases worn - but okay.

Startup, a bit of ignition and otherwise a shot or 2 out through the carburetor? Think the ignition is just a little too early. But also would not put it completely ratarded at TDC - had hoped to be able to set it just a few degrees before TDC.

However, there is something that irritates me, it sounds like there is a click from the distributor when cranking the engine? I do not know if it's just ignition every time it sends a spark away - but I do not think it was there before ..... Should not wonder if something is broken now ...

What do you think about it?
1) Shot out of the carburetor (do not think it is due to too much fuel)
2) Set ignition precisely on TDC, can it go or will it be too strange? I can not adjust it before the engine runs, as it does not have degree marks? :/
3) Click-sound from destributor, have you experienced it?

Thanks

 

[Danmarine]

Hello everyone
Then the engine finally came to life.

I do not know why the click sounds as described earlier came - but they are gone now.

Opened the distributor, adjusted the ignition once more, just to be completely sure.
Put a jumper on battery for coil + and tried to start. A little cough and smoke, tried again, but where I gave it a little gas and it ran.
It does not run quite smoothly at idle, but it can drive and can also take gas. Think the second is because it is adjusted for ignition on directly on the TDC.

Let it run for some time and turned off the engine. Went out to car to pick up advanced light for ignition. Got a cup of coffee and went back to the boat.

Connected everything, got the ignition cables laid nicely, put jumper to battery + to coil + and would start ...... the engine will now not start again !!

All in all, I'm thinking it's all due to the carburetor.
1) it must have some gas to start
2) it runs unevenly at idle + ignition is probably also a bit bad.
3) When the engine was started for the first time in the morning of the times after a long time condition, it was also fucking hard to start.

Can I in any way check if it is due to the carburetor, poor mix of air and petrol?
The carburetor has been disassembled, cleaned, gaskets changed, new pump, etc. There will also be a nice amount of fuel if you open the throttle by the hand? :/


Incredibly it must be so hard. But it really seems as if it is drowning and the spark plugs are therefore soaked and will not ignite

help me, I'm fucked up Sorry

 

[ddbyrd3]

Something you can check, pull the ignition module from the distributor base. There is supposed to be a layer of thermal grease under the module. I have seen where this thermal grease was gone, and caused the module to overheat. May not be the sun total of your issues, but may be a potential issue as it related to your ignition issue. Its a very cheap check.

Have you measured your fuel pressure? 5 to 7 psi on carbureted motors if I remember correctly. I have seen people install high pressure pumps that should have low pressure.

 

[Danmarine]

Hello everyone.
Sorry for the very late feedback. But just a few things went in the way, in private life and work and yes, then summer really starts here too - which means more work; =)

However, I still have some challenges with the engine and hoped a bit that a break from here could give some good ideas - if nothing else some peace

But the story is that the engine has actually started fine and run fine. We sailed at a time when it would not really come up in full speed and we never really found the reason for that. Sailed towards port and I jumped off, the others sailed further out to sea. After a while, they said that it suddenly took off and now it was running properly and could go to full speed ... Super well, so it works properly now.

Unfortunately, after a few days, the problems reappeared and it started teasing again. It starts fine in cold mode, accelerates fine (just not up to max). When the engine is hot and we sail out at full throttle, it shoots back into the carburetor and sometimes, one can also feel a split second delay on the engine?
If we keep the engine idling, it runs fine - and then it can suddenly go out. It is then difficult to start (typically always when it is hot). But with a little gas / fuel, it starts again.

However, it will still not take full turns and therefore it cannot reach its maximum speed. In addition, it has a tendency to sometimes shoot back into the carburetor.

Sails quietly for some time, suddenly the engine goes out and then it can not be started again at all ... Probably it can be started tomorrow when it has all cooled down. This has been the case sometimes.

But we can not figure out what caused it?

We had a suspicion for the carburetor, but it is newly overhauled and works really okay. So we think a bit about whether it is due to lack of fuel or a fuel hose that is pinched / leaking and thus prevent fuel flow or carries air with it? Or possibly. a pump that does not deliver what it is supposed to. (We have not measured the pressure)

But everything else has gradually changed and new. There soon a new engine

So the question is if any of you have experienced similar symptoms or heard of similar and maybe could give a hint on where to start?
We have adjusted the ignition and it turns on properly and on all cylinders. Advanced timing has also been performed. As mentioned, it runs super fine ... and suddenly it starts to grumble and yes, it has a hard time getting up to maximum revs, usually it can only pull to 4100 rpm.

And last but not least, the words of thanks go out to all of you for your help!
Hope the weather is with you over there and all is well :=)

 

[dubs283]

Sounds like a fuel supply issue. Something in the tank randomly blocking the pickup comes to mind based on your observations

 

[Danmarine]

Thanks for the advice, dubs283

We've messed around a bit in it again. After the engine died, out on the water. We checked the ignition, there was no more spark - very faint. Despite distributes, coil, ignition, etc. was brand new. In addition, several of the spark plugs were sooted and the one spark plug was the tip melted ??

We fitted a new ignition coil and new spark plugs, checked spark - now there is full spark again. The question is whether the coil that sat there previously had a fault or just burned off during operation?

But now we are also just trying to get the fuel pump checked and whether it gives the pressure it needs. Then we remove the filter and put on a new one. Take the fuel hose from the tank and mount it directly in a can of completely clean and fresh petrol.
The question is whether it gets too much fuel? So if it is too hot and therefore the spark plug melts?
Have you tried anything similar?

Thanks