what is the other camshaft like Adam, and if it's only one camshaft plus cap and cylinder head bearing faces that are affected*, is it the same one as in the first failure -i.e. an exhaust? Maybe you didn't get a chance to see both inlet and exhaust cams and housings on first failure. Also, can you clarify the symptoms leading up to the second failure (sluggish/loss of power/engine noise before stopping?) as it's now revealed the belt didn't fail completely as per title plus I assume there was little or no mechanical clatter or else (I assume) they wouldn't have taken the chance of running it. As Hugh said, my first thoughts were a blocked oil gallery but it would have to be in the crankcase if a different head experienced the same starvation as too high a coincidence. Did they run the engine with rocker cover off to confirm oil starve? *a mystery that both not affected if starvation, particularly as exhaust cam is lowest.
Yes, it was the same camshaft - exhaust. The inlet looks very good. Nothing to worry about. From the first failure I’ve seen this head with seized bearing face, shreded belt and checked the piston surface. I was riding 14km mostly in a traffic jam, just about 50-60km/h, no weird sounds, no oil light on. Suddenly engine stopped while on the throttle so I pulled the clutch and get to the side of the road. I’ve tried to start it once but the sound was like only vertical cylinder is working so I thought it might be the same thing as it was the first time. Guys from workshop picked up the bike and I was heading back home:/
guy from the workshop just told me that he found cause of the problem. Said that there was no oil distribution in horizontal head because somebody dismantled engine and tightened some of the bolts in wrong places including special drilled one that distributes oil from one half of the engine to another. today I'm going there to see it. Can it be true?
So this mechanic is telling you that you Rode 70-80km (according to your original post), with no oil in one half of the engine? I'd have thought that would make one hell of a noise
Hardly half of the engine, only the head would be affected, the rest of the engine would be lubricated as normal.The head would run until it got too hot for any residual oil to keep it lubricated and the camshaft caps should have been greased at assembly anyway. So 70-80km is probably reasonable before it gave up. But was the "somebody" a mechanic at the dealership or previous to that service?
Hmm. Not good, as the responsibility lies with them, not the workshop that did the service. Hope it doesn't work out too expensive for you.
Yes but In my opinion they should’ve checked if the oil flows properly after first failure. Keep your fingers crossed
The inlet and exhaust valves even more so would not run that long without binding even if it wasn’t totally dry and would’ve shown up on the cam lobes at the very least plus the owner has already stated that the inlet cam is unaffected.
Low pressure is different of no pressure at all. It would take some time to wear and blow because of the heat.
ok, so everything is clear now. someone before has stripped down the engine and changed bolts by mistake, especialy drilled one that is supposed to deliver oil from one side of the engine to another. Now my baby is running perfectly Thank You so much guys!
