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British Bikes / Re: Significant oil out the breather of a 1969 Triumph T120 Bonneville
« on: April 24, 2017, 11:38:19 AM »
Triumph's double plunger pump is excellent for holding back the oil ie not draining down, but one thing I've seen on these engines is a crack in the crankcase scavenge pipe, leading to poor scavenging and too much oil in the base of the engine when running. The old check for this is a rubber tube on the end of the scavenge pipe in the "sump", your finger on the scavenge pipe in the oil tank and suck on the rubber tube. Vacuum should hold, but if it doesn't then it's an engine strip to fix.
Rings (in my experience) seat/seal quickly and there is no "break in period" these days, but of they haven't sealed after a few runs they somethings wrong and they're never going to, so that would be a top-end strip.
There's nothing you could misassemble on this breather to cause oil to be spat out like this.
Rings (in my experience) seat/seal quickly and there is no "break in period" these days, but of they haven't sealed after a few runs they somethings wrong and they're never going to, so that would be a top-end strip.
There's nothing you could misassemble on this breather to cause oil to be spat out like this.