TR2/3/3A Intake header crossover passage.....

[karls59tr]

What is the best way to clean out the carbon out of the crossover passage?

 

[sp53]

Spray can carburetor cleaner

 

[Hamish Racing]

Shouldn’t be too dirty esp with carbon as it shouldn’t have burnt residue on the intake side.
but may be you could suck some string through using a vacuum cleaner and then pull a soaked rag through the cross over ?

 

[karls59tr]

Shouldn’t be too dirty esp with carbon as it shouldn’t have burnt residue on the intake side.
but may be you could suck some string through using a vacuum cleaner and then pull a soaked rag through the cross over ?

When I pulled the cylinder head to address the blown head gasket (possibly F08 failure...can't determine that till Spring because of weather conditions here) I found that the inside of the intake manifold was just covered in carbon! There may be another issue going on in addition to the gasket problem namely a suspected broken chain tensioner and possible skipped timing chain tooth? Would the latter cause such a carbon build up?

 

[Hamish Racing]

I would have thought that carbon on the intake side suggests combustion before the inlet valve is closed - or opening just after ignition. But this would mean a distinct lack of compression.
i think this would cause carb flames/spitting back. So yes slipped timing chain may contribute to this issue
not our carbs but same principle video