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Dcal
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Steep it in neat TFR overnight and pressure wash it to see what you have.
I wouldn't blast it with anything other than soda as the grit will get everywhere and you might struggle to get it clean again.
Is the valve head stuck in the piston?
Did it bend the push rod?
It might have saved it from doing more damage.
I had the head off one of them a couple of years ago, from my brothers boat, he sold it last year after getting another boat but he might still have the workshop manual.
I wouldn't blast it with anything other than soda as the grit will get everywhere and you might struggle to get it clean again.
Is the valve head stuck in the piston?
Did it bend the push rod?
It might have saved it from doing more damage.
I had the head off one of them a couple of years ago, from my brothers boat, he sold it last year after getting another boat but he might still have the workshop manual.
W.olly
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The Valve stem came out easy, well a slight tap with a screwdriver handle and it slides nice . engine turns over smooth, doesnt seem any more damage yet. ill check the push rods aswell.
Very repairable, and my guess unlikely to be cracked, unless the valve has hit the chamber face edge on. And you only need one seat, unless your flush, then maybe do all the exhausts.
No worries about dust, just blast it, there is only one oilway.
Edit to add - the one that's broken has a seat fitted - I wonder if that's why the valve snapped - seat not concentric...
No worries about dust, just blast it, there is only one oilway.
Edit to add - the one that's broken has a seat fitted - I wonder if that's why the valve snapped - seat not concentric...
brightspark
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and if u get it skimmed all the iron shavings no different to sand getting everywhere. just blow em out. the recon place will anyhow
Barking Mat
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This is your boat engine which only turned one way, I guess.
I scrapped a b20 5 years ago, but I've too much stuff.
Is the cylinder head actually damaged, sorry, I skimmed through this thread, the gunk should come off.
I scrapped a b20 5 years ago, but I've too much stuff.
Is the cylinder head actually damaged, sorry, I skimmed through this thread, the gunk should come off.
Burdekin
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They don’t have seats fitted, they are just machined into the cast head. You normally just fit hardened seats into the exhausts to run non-lead petrol. Have you priced rebuilding a B20, not cheap.
500e
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That's had water in for some time the valve seat well eaten Exhaust ports look they have heavy corrosion, is it running in fresh or salt water, if indirect cooling Heat exchanger fault?
I would look for replacement cylinder head, they should not be that rare + have you looked at rest of cooling channels ? none of it looks good % damage as @Dcal says
I would look for replacement cylinder head, they should not be that rare + have you looked at rest of cooling channels ? none of it looks good % damage as @Dcal says
W.olly
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brightspark
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if u had been local i could have given it a dust over in the blasting cabinet with kiln dried sand it would come up well 
Burdekin
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Can’t open it. B20 heads don’t have have fitted valve seats and yours don’t look like they have them. Unless the marine version is different.
W.olly
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A few folk have said the marine are different, you can even buy the valve seats.
here for cars aswell
Volvo B18 & B20 Exhaust Valve Seat Set of (4) P1800,122S,544,142,144,145 AQ130 | eBay
Set of (4) Exhaust Valve Seats for Volvo B18 & B20 Engines. P1800s - 1800E - 1800ES - 122S - 544 - 142 - 144 - 145 - 242 - 244 -245 and Volvo Penta AQ115 & AQ130. All My Pictures are of the actual part you are buying in most cases and not a file photo.
www.ebay.co.uk
Wrong - look again....
W.olly
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And i could of but dont come to Yarm anymoreif u had been local i could have given it a dust over in the blasting cabinet with kiln dried sand it would come up well
Burdekin
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It’s common to fit them. Maybe the marine version is different the , never fitted to the car heads.A few folk have said the marine are different, you can even buy the valve seats.
here for cars aswell
Volvo B18 & B20 Exhaust Valve Seat Set of (4) P1800,122S,544,142,144,145 AQ130 | eBay
Set of (4) Exhaust Valve Seats for Volvo B18 & B20 Engines. P1800s - 1800E - 1800ES - 122S - 544 - 142 - 144 - 145 - 242 - 244 -245 and Volvo Penta AQ115 & AQ130. All My Pictures are of the actual part you are buying in most cases and not a file photo.www.ebay.co.uk
Barking Mat
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Unlikely.
Barking Mat
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Frankly, I rate Volvo, but not Volvo penta, God knows I've seen a few.
And I've been driving various Volvo's for a long, long time, but IF, I had a boat I'd never stick a penta in, maybe the new ones are better? The three cylinders are good as anchors, that's it, the B series red block was an amazing engine, but I know NOTHING about the Marinised versions of these.
And I've been driving various Volvo's for a long, long time, but IF, I had a boat I'd never stick a penta in, maybe the new ones are better? The three cylinders are good as anchors, that's it, the B series red block was an amazing engine, but I know NOTHING about the Marinised versions of these.
Burdekin
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I’m the same, have three B20 Volvos. Strong engine that can run at 5000rpm all day long.
Burdekin
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No it hasn’t, are you looking at the intake ports?Wrong - look again....
Bullet2012
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It’s carbon on rust, as I stated in your other post get the exhaust checked . I do not believe you have an issue with the heads, if anything it’s a problem with the water cooled exhaust, they get neglected and freeze on fresh water boats.
I am almost 100% certain it is the Issue.
I am almost 100% certain it is the Issue.
