I have just had a disturbing knocking in my Volvo
D2-55 potentially diagnosed by the Volvo mechanic
. It is possibly a failed pressure plate between the engine
and sail-drive gearbox
We have not yet dismantled things to inspect but it is apparent that is not linked to the actual engine
internals such as crank or pistons etc.
I had previously noticed the knock and had listened carefully to try and diagnose (failing of course) but my untrained ear told me it was less likely an engine noise
due to the location of the sound.
Stripping the beast down will be awkward and expensive so I will have the mechanic
The mechanic repaired a similar problem on another boat a year ago which was caused by a rope
round the prop stopping the motor
suddenly. All the load was taken by the pressure plate which failed as a result.
I have never managed this feat in the three years I have owned the boat but it may have occurred under a previous owner.
Any comments or ideas as to the source of the knock would be useful and gratefully received.
The knock does not appear to be absolutely regular but is quite noticeable, sufficient for me to pick it up myself.