Finally, I have tracked down the knocking !!!
And this has been confirmed by two wiser and far moreexperienced friends.
Two circlips have been incorrectly used to retain the gudgeonpin and THREE of the eyes have broken off. These bits of shrapnel had theneroded the aluminium piston and parts thereof appear to have found their way tothe crank pin bearing and totally wrecking it. Despite 1/8â of vertical play(notice Iâm not measuring in thou!) the piston has not damaged the valves.
At the same time the oil control piston ring had becometrapped by a burr from the damage caused by the circlip eyes. This then seizedthe ring which then consequently broke.
So, all in all â?.. Iâm finally going to get my hands dirty!
Iâve got Mike Pembertonâs excellent DVD but before I canstart on the engine proper, I need to get the darn thing out of the frame.
So, my first question:
Is there a knack to removing the engine sprocket retain nutand is it right hand or left hand threaded?
TIA
Ian
Attachments pistondamage.jpgHi. The engine sprocket is…
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Thanks Ian Worked a treat.…
Thanks Ian
Worked a treat.
Thanks also for the other info, will make a note for later use.
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Has anyone else experience…
Has anyone else experienced anything like my problem?
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Hi.
The engine sprocket is right hand thread. I use a'U' (sort of)shapedpiece of 1/4 inch alloy plate with a slot wide enough to fit the con rod. The plate then fits under the piston across the crankcase mouth locking the crank assembly so allowing leverage to be applied to the engine sprocket.
While we're on the subject - the pump 'worm' on the other side of the crank is left hand thread, the clutch retaining nut is right hand thread, the big gearbox sprocket nut is left hand.
Cheers.
Ian.