My Triumph 5SW seems to have suddenly developed a lot of pressure in the timing case. First noticed last week by a squeaking sound from air pushing past the mag seal and oil mist on the end of the mag.
So I've replaced the breather valve as the brass disc inside had disappeared and replaced the mag seal. Loads of compression and not a whiff of smoke from the exhaust, but the pressure and squeak is still there. When I took the mag bung out from the timing cover and ran the engine the blast from the plug hole seemed excessive to me. Any ideas anyone? Ron
Well there is only one place extra pressure can come from and that is past the piston rings, as you say it appears to have plenty of compression and doesn't smoke. I guess the only way to find out what, if anything is wrong - Is to take it apart. I'm in a slightly different situation with my G3l which I have stripped completely to diagnose what sounds like a big end knock. The engine is mostly new or NOS, and we can't find anything wrong with it... Very annoying !
Yes Jon. Barrel and head off today and all that I've found is that the ring gaps have increased from the 12 thou I set them at to about 25 thou .....In only about 200 miles. Where can I buy good quality rings? These came from reputable "Cox & Turner" So it seems, not all their vast stock is up to mustard. Ron
Would it be worth contacting Omega Pistons ? They helped me out a few years ago with circlips and rings on a MHR Ducati I was rebuilding which had their pistons fitted. My G3l has rings from Cox and Turner, it has done about 800 miles since I rebuilt it. Think I'd better check them out as part of the job...
What we have deduced is that the rings are worn down more on the ends and it's suggested by C&T that maybe they supplied me with oversize rings instead of standard? (correct rings coming)
My other though which I'd appreciate feedback on, is that since my engine breather was not working, ie fully open on the upstroke as well as the downstroke.....Would that reduce the oil mist being sucked up the bore by the vacuum on the upwards stroke by a working breather flap valve?? (The breather is working properly now). Ron
