David435
Member
Hi All
I purchased a Princess motor cruiser in September 2019 and since then have only run the TAMD63L engines for a total of 30 hours . At the time of purchase we engaged Volspec to undertake an engine survey and the maximum rpm load while moored was port 3150 rpm and starboard 3350 rpm while on sea trial port was 2800 rpm and starboard 2900 rpm. In March 2020 the port injection pump was removed and serviced due to an oil leak together with the injectors. I always cruise at a maximum 2500 rpm and have never fully opened the throttles until last week. We were returning from Brighton to Chichester and as it was calm conditions decided to give the engines a good blast. The throttle levers went fully forward but the port engine just maintained 2500 rpm while the starboard engine went to 2900 rpm. My immediate thought was perhaps not enough fuel was getting to the port engine as the filters had never been changed but then slowed the boat down and fully opened the throttles again with the clutch engaged and got 3400 rpm on both engines. The cruiser was only returned to the water mid May after pressure washing, antifouling, new anodes fitted and propellors, shafts, P brackets and trim tabs burnished. I am quite comfortable to continue cruising at 15 - 17 knots from 2500 rpm but would like to know why the port engine is not producing the extra rpm while under load and whether there might be a simple explanation and possible fix.
I purchased a Princess motor cruiser in September 2019 and since then have only run the TAMD63L engines for a total of 30 hours . At the time of purchase we engaged Volspec to undertake an engine survey and the maximum rpm load while moored was port 3150 rpm and starboard 3350 rpm while on sea trial port was 2800 rpm and starboard 2900 rpm. In March 2020 the port injection pump was removed and serviced due to an oil leak together with the injectors. I always cruise at a maximum 2500 rpm and have never fully opened the throttles until last week. We were returning from Brighton to Chichester and as it was calm conditions decided to give the engines a good blast. The throttle levers went fully forward but the port engine just maintained 2500 rpm while the starboard engine went to 2900 rpm. My immediate thought was perhaps not enough fuel was getting to the port engine as the filters had never been changed but then slowed the boat down and fully opened the throttles again with the clutch engaged and got 3400 rpm on both engines. The cruiser was only returned to the water mid May after pressure washing, antifouling, new anodes fitted and propellors, shafts, P brackets and trim tabs burnished. I am quite comfortable to continue cruising at 15 - 17 knots from 2500 rpm but would like to know why the port engine is not producing the extra rpm while under load and whether there might be a simple explanation and possible fix.