2006 Volvo 5.7 osi-d crank no start

[Tail_Gunner]

That head gasket was fried, can you post pics of the head and block area where the gasket was blown? Good work so far, keep going.

 

[Lou C]

That's what I was getting at. If this engine never overheated, something else besides a bad dist cap made that happen. My engine had a bad overheat but the HGs didn't look that bad.
Check:
fuel mixture
total timing advance at specified RPM
propping, you may be overpropped (prop to large in pitch), causing engine to not reach specified wide open throttle RPM. You should prop for the upper end of the range, let's say 4800, if the range is 4600-4800. If your wide open throttle rpm has been low like 4000-4200 that alone could cause this, what happens is you don't realize it but you are laboring the engine every time you get above hull speed, especially when you try to get up on plane. That overheats the combustion chambers (even if the water temp is normal) and burns exhaust valves and blows HGs eventually.

My boat is on the large/heavy side for the 4.3 V6 so I have it propped to hit 5000 rpm. That reduces the strain on the engine to a significant degree.

 

[woodsy01]

That's what I was getting at. If this engine never overheated, something else besides a bad dist cap made that happen. My engine had a bad overheat but the HGs didn't look that bad.
Check:
fuel mixture
total timing advance at specified RPM
propping, you may be overpropped (prop to large in pitch), causing engine to not reach specified wide open throttle RPM. You should prop for the upper end of the range, let's say 4800, if the range is 4600-4800. If your wide open throttle rpm has been low like 4000-4200 that alone could cause this, what happens is you don't realize it but you are laboring the engine every time you get above hull speed, especially when you try to get up on plane. That overheats the combustion chambers (even if the water temp is normal) and burns exhaust valves and blows HGs eventually.

My boat is on the large/heavy side for the 4.3 V6 so I have it propped to hit 5000 rpm. That reduces the strain on the engine to a significant degree.

I’ll try to get some photos but that photo of the gasket is after about a week with salt water on it and I had also pulled the “stainless” ring away myself to see how it was put together. It wasn’t as bad on initial inspection.
The only thing I can think of is the past two seasons the harbour master has reduced speed to 12 kts in the harbour so I’ve been probably labouring the engine at about 2500 rpm at 12 knots so it doesn’t take forever to exit/return from an outing. I was reaching about 5000 rpm WOT When I trialled props about 3 yrs ago, that’s when it was replaced and I went down a size from what they sold me initially as I couldn’t get past about 4000 rpm with the first one I trialled… only ran it for 10 mins before changing.

 

[woodsy01]

I’ll try to get some photos but that photo of the gasket is after about a week with salt water on it and I had also pulled the “stainless” ring away myself to see how it was put together. It wasn’t as bad on initial inspection.
The only thing I can think of is the past two seasons the harbour master has reduced speed to 12 kts in the harbour so I’ve been probably labouring the engine at about 2500 rpm at 12 knots so it doesn’t take forever to exit/return from an outing. I was reaching about 5000 rpm WOT When I trialled props about 3 yrs ago, that’s when it was replaced and I went down a size from what they sold me initially as I couldn’t get past about 4000 rpm with the first one I trialled… only ran it for 10 mins before changing.

I’m led to believe the crab distributor has a common fault
Of misfire between 3 and 5 which is where it blew, my distributor cap was found to be faulty too. I only experienced issues for one outing so hopefully no major damage.

 

[Lou C]

How long have you owned the boat?
Is it possible that a previous owner had it over-propped?
what do the spark plugs look like?
make sure there are NO restrictions in the fuel system starting with the tank vent, and anti siphon valve.

 

[woodsy01]

Lastly, timing has never been altered, I bought this boat new in 2006

 

[woodsy01]

How long have you owned the boat?
Is it possible that a previous owner had it over-propped?
what do the spark plugs look like?
make sure there are NO restrictions in the fuel system starting with the tank vent, and anti siphon valve.

Plugs were wet and black when first issue arose hence I started changing plugs etc etc and then a new distributor cap got it going but It didn’t feel right after a 5 min run so I pulled the head

 

[woodsy01]

pics

 

[QBhoy]

pics

Wonder if that’s been throwing fuel into that unit, but not igniting it (perhaps as a result of failed cap or similar). You’d imagine you’d have noticed or felt her running poorly for a while before this would happen though. Sorry if it’s been asked before, but what was the oil like ? Any sign of and dilution ?

 

[woodsy01]

Wonder if that’s been throwing fuel into that unit, but not igniting it (perhaps as a result of failed cap or similar). You’d imagine you’d have noticed or felt her running poorly for a while before this would happen though. Sorry if it’s been asked before, but what was the oil like ? Any sign of and dilution ?

I think it happened last proper trip out, I noticed it started running rough at idle and then wouldn’t start once back at marina. Oil levels and consistency look fine. I’m fairly intuitive and felt it wasn’t 100% and sure enough, wouldn’t start once shut down. Hoping for a good result of course. Do you agree gasket not so bad initially? Ie before I pulled the ring away from the gasket

 

[QBhoy]

I think it happened last proper trip out, I noticed it started running rough at idle and then wouldn’t start once back at marina. Oil levels and consistency look fine. I’m fairly intuitive and felt it wasn’t 100% and sure enough, wouldn’t start once shut down. Hoping for a good result of course. Do you agree gasket not so bad initially? Ie before I pulled the ring away from the gasket

Does the oil smell of fuel at all ?

 

[woodsy01]

Does the oil smell of fuel at all ?

No

 

[QBhoy]

No

Ok. Fair play. Again…sorry if I’ve missed anyone or you saying so before, but just around the picture that shows the washed and shiny piston crown. Has that been discussed before now ? I’m on the phone here and takes a while to look back through everything easily

 

[woodsy01]

Ok. Fair play. Again…sorry if I’ve missed anyone or you saying so before, but just around the picture that shows the washed and shiny piston crown. Has that been discussed before now ? I’m on the phone here and takes a while to look back through everything easily

No it hasn’t been discussed

 

[QBhoy]

No it hasn’t been discussed

ok...there will be many many guys better versed than I on this, for certain. But it looks to me, as if that unit and piston head has been washed clean, caused by unignited fuel or water. This may have happened after the rupture of the gasket perhaps...but if it didn't..it would suggest an ignition problem or failure (as perhaps suggested earlier) for that particular cylinder. One might also imagine that if it did happen after the gasket blew..the cylinder next to it, might also be washed clean too. Not sure. Would love to hear what others think. Guys like this @Bondo @achris @alldodge the @Lou C @Scott Danforth and the other clever guys that have commented previously.

 

[woodsy01]

ok...there will be many many guys better versed than I on this, for certain. But it looks to me, as if that unit and piston head has been washed clean, caused by unignited fuel. This may have happened after the rupture of the gasket perhaps...but if it didn't..it would suggest an ignition problem or failure (as perhaps suggested earlier) for that particular cylinder. One might also imagine that if it did happen after the gasket blew..the cylinder next to it, might also be washed clean too. Not sure. Would love to hear what others think. Guys like this @Bondo @achris @alldodge the @Lou C @Scott Danforth and the other clever guys that have commented previously.

What’s the result if that is the case ? Still worth boxing on with gasket replacement? Thanks

 

[QBhoy]

What’s the result if that is the case ? Still worth boxing on with gasket replacement? Thanks

Not totally sure to be honest. I’m more a diesel man to trade…only an amateur maintainer and owner when it comes to these GM petrols. But I’d take advice from the guys I’ve tried to include on my last post and go from there. It certainly looks washed by either fuel or water to me. Possible that you may have had a gasket blown as a result of hydro lock. One way or the other.

 

[alldodge]

I don't see a lot a washing from fuel. Check the flatness of the head as mentioned prior. If its withing spec, clean, new gasket, torque to spec and run it

 

[QBhoy]

I don't see a lot a washing from fuel. Check the flatness of the head as mentioned prior. If its withing spec, clean, new gasket, torque to spec and run it

have a zoom in at the last photo posted just a few posts up AD. That number 3 unit looks very shiny.

 

[alldodge]

The gasket blew between 3 and 5 so I'm seeing steam clean and not from fuel