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Dear all, I have a beta marine 38, with a PRM delta gearbox (no input shaft spline wear) driven by an R & D 'extra dampening' drive plate. Coupled via a double-cardan/constant velocity joint (from a london taxi propshaft), through a plumber's block to the stern bearing. When engaged in gear, at tick-over (wound down to 550rpm), there is a distinct 'clonk-clonk-clonk' coming from the region of the gearbox. At higher engine speeds, this noise seems to go away, although that could just be the engine drowning it out. The shaft/cv join moves freely (with the force expected to drive a prop in water) by hand in both directions. The engine is angled down slightly on its mounts (adjustable screw-nut ones) so that the double-cardan input is slightly off-set. My question is - should I worry about this? I have no nylon coupling between the gearbox and the prop/cv-join input shaft, so is this likely to just be 'clonky plumbers block'? Should I raise the tick-over? It was wound down when the engine control lever insisted on increasing the rpm prior to engaging gear - there is now a correct control lever. I think the rated tickover is 750rpm. I will increase it. Many thanks, Patrick Vale (cross-posted to http://www.waterwaysworld.com/questions.cgi) Which seems to have replaced the title - should read 'Drive train clonking in gear'.
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Does anyone know if there's an equivalent air filter available from an ordinary motor factor? Or anywhere I could order one online to be delivered before 3rd June? Thanks for any help... Jane x