Vanguard v twin problem.

[spudulike]

Ah, sounds like the head gasket on the right side has cracked and letting in oil. Bummer 😞 

[fleehillfarm]

I think you are right it's looking more like a blown head gasket on the right cylinder. It would appear from doing a bit of research online that you can still return a good com pression even with a blown gasket depending on where the gasket has failed. I'll take the head off and have a look. Thanks to everyone for your input.

[Mick Jones]

1 hour ago, fleehillfarm said:

I think you are right it's looking more like a blown head gasket on the right cylinder. It would appear from doing a bit of research online that you can still return a good com pression even with a blown gasket depending on where the gasket has failed. I'll take the head off and have a look. Thanks to everyone for your input.

 

[Mick Jones]

Another possibility,

 A stuck oil control ring on the cylinder that's smoking. Especially if the engines been stood up for a while.

[roys]

4 hours ago, fleehillfarm said:

I think you are right it's looking more like a blown head gasket on the right cylinder. It would appear from doing a bit of research online that you can still return a good com pression even with a blown gasket depending on where the gasket has failed. I'll take the head off and have a look. Thanks to everyone for your input.

Please keep us updated on what you find.

[fleehillfarm]

Hi everyone - I took the head gasket off this  morning and it was pretty much knackered. I dont know whether it was rough enough to have caused all the smoke. I'll find out when I put it back together. Also the gasket on top of the head where the inlet manifold is attached to the head was completely destroyed and in two pieces. That may be even more relevant. I don't really know.  Anyway I'll update as soon as its back together which may be some time as I have to source the new gaskets online.

[openspaceman]

2 hours ago, fleehillfarm said:

Hi everyone - I took the head gasket off this  morning and it was pretty much knackered. I dont know whether it was rough enough to have caused all the smoke. I'll find out when I put it back together. Also the gasket on top of the head where the inlet manifold is attached to the head was completely destroyed and in two pieces. That may be even more relevant. I don't really know.  Anyway I'll update as soon as its back together which may be some time as I have to source the new gaskets online.

These engines have pressure lubrication, i.e. with an oil pump, don't they?

 

If so and the small rectangular hole is an oil gallery it would explain why oil was being pumped into the head rather than combustion gas pumped out.