A coupling with a grub screw hole, usually drilled over any keyway the coupling may have. It is provided to stop axial movement along the shaft.
https://www.midlandchandlers.co.uk/products/r-d-4-split-half-coupling-1-1-2-shaft-rd202153f
Bought one of those a few years back, well worth the money. Not sure how accurate the boat rev counter will be but the most accurate results would be from checking the prop shaft and the camshaft pulley.
Just wondered if the the boat had been aground on the opposite side (due to a falling canal level) and shipped some water into the engine bay then said water was then pumped out by the bilge pump when the boat levelled on re-floating.
The part number on the piston indicate it's for a LD, I assume the /5 at the end indicates oversize dimension?
The image of the caliper reading appears to indicate the piston is 0.025" oversize.
Our HA2 was an industrial job modified for marine use and totally overhauled round 1998, only used it because it was FoC.
Won't disagree on the noise issue. (17 seconds in)
A very nice gentleman indeed. Saved me from staying up all night checking the pontoon as the swell was lifting the boat and pontoon at varying frequencies.
We once arrived at Limehouse at low water just as the tide was turning, ran past the lock and crossed downstream then moored on the floating pontoon. Lock keeper was just going off duty but was unhappy to leave us outside overnight. spent the next 3/4 hour inching over the sill as the tide rose.
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