IanStew Posted March 23, 2017 Report Share Posted March 23, 2017 I've got a 70' trad with a Ruston Hornsby engine and its developed what can only be described as a warble noise at mid revs. In gear on tick-over it's quiet and at higher revs it's quiet. Any ideas? Link to comment Share on other sites More sharing options...
cuthound Posted March 23, 2017 Report Share Posted March 23, 2017 It's almost certainly the result of thrushing the engine Link to comment Share on other sites More sharing options...
MtB Posted March 23, 2017 Report Share Posted March 23, 2017 I doubt the OP will swallow that one!! Link to comment Share on other sites More sharing options...
BEngo Posted March 23, 2017 Report Share Posted March 23, 2017 Get it doing it and then turn the stern tube greaser down hard. If it stops ( temporarily) it is most probably some wear in the stern tube which you will need to assess next time you are aground in a staircase or out for blacking. My stern tube does this, and has for about 10 years, but the traditional stuffing box packing isn't leaking and has lasted about 8 years, so there isn't enough wear to justify replacing it. IMO. If not it may just be the prop singing. The dawn chorus does start to get louder this time of year! Have a feel round the leading and trailing edges of the blades and fair out any major nicks (without taking it too much out of balance). Other things to check are any intermediate bearings- Thrust bearing, yoke bearings in a truck-type prop shaft, middle plummer block for a solid shaft etc.- and finally the gearbox back bearing. The latter will need the shaft disconnecting. The others should be possible with a bottle or scissor jack and/or a suitable lever together with a dial gauge or similar. N Link to comment Share on other sites More sharing options...
Featured Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now