Dear DougR,
Thank you very much for your helpful reply. I can confirm that the
oil level is ok and the oil has been changed this season. The oil type is as per
engine oil and I wondered if a heavier oil might help. I will certainly start by reducing the
engine revs as you suggest as she’s idling at 850 RPM. Since
posting the enquiry, I’ve been wondering if the problem may partly be the
3 blade Variprop as it doesn’t appear to have any soft stops. I’m wondering if I should fit a fixed
3 blade prop and see if the slam is reduced. Do you think I should try say EP 90 oil in the box?
I really appreciate your help as there’s no substitute for knowledge and experience.
Many thanks again,
Marine Jim