Cylinder Head Gasket Oil Leaks
Triumph sixes - and probably the four pots too - are prone to leaking oil along the pushrod side of the head gasket. The reason seems obvious, as the head studs are clustered around the bores, providing insufficient clamping around the pushrod tunnels.The result is a messy oil leak down the distributor side of the block.
I've always understood the answer is to use Wellseal along the edge of the head gasket and around the rocker oil feed hole to seal this leak, and this has worked well on tw
On the TR6, the original breather is merely a pipe from the rocker cover to the air plenum, there's no crankcase breather that I'm aware of. There's a flame arrestor fitted in the breather pipe, probably because of fears that malfunctioning over-rich PI could cause petrol to find it's way down the bores and into the sump, thence out through the breather. That could make for an almighty bang in the plenum if the engine were to spit back through the throttles!
Nigel