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Hi RamonI also have a few ideas on how to locate the over-clearance: To find out which cylinder it comes from, you can disconnect the valve rod from the excentric. Then you lock the crankshaft (by clamping a piece of wood on the front surface of the flywheel). If you now supply only one of the cylinders with pressurized air, you can actuate the valve gear by hand and see if there is any sound. You may test at different positions of the crankshaft, at the dead centres, when the crankshaft is 90° to the dead centre and also 45° from the dead centres. This way you should be able to find out if it is one of the piston rod bearings (or the pistons themselves). And also which piston rod then causes the "knock". You may also use a dial indicator when changing load on the bearings (when you actuate the valve by hand), measuring the crankshaft, the piston rod, crosshead (vertical and sideways!!)Cheers Florian
Hi GeorgeWell, if the source for that knock is a change of load, it should also happen when the crankshaft does not turn. And by checking at different positions of the crankshaft, you should be able to locate the problem - or at least to find out which cylinder is the cause of that noise. If there is no sound when the engine is not running, then I can't imagine any reason for that sound (at least right now, when I don't have the engine in front of me) Florian
Bob, if you are referring to an LP cylinder, it's not a compound- both are the same size. If not, what do you mean by 'LP'Regards - Ramon
Ah the joys of old age, approaching blindness and a lack of perspective! OK, I mean the cylinder and associated bits nearer to; the camera or put another way, me as the viewer, (flywheel end).
Hi Jeff - Yes, agreed, I would much rather trace the source and fix it but it's going to have to wait a bit at the mo. I don't have any heavy oil other than steam oil to see - I guess I could try that but I'm set on new ones now. Re the Timesaver - 'I wish' - I am aware of it's attributes and looked in to getting some previously but the expenditure for the minimum that can be bought isn't really justifiable now, particularly when half a teaspoonful would probably 'see me out' Thanks for the thought though Regards - Ramon