RPM loss on Volvo TAMD63L

[volvopaul]

Hi All
I am still struggling with the problem of loss of revs on the port engine.
We have now changed the primary and engine filters and on a sea trial on Tuesday still only managed to achieve 2,500 rpm with the throttle wide open on the port engine. We checked the exhaust at this speed and there was no indication of any excess smoke of any colour, although we do get the normal black exhaust residue on the fibreglass near the exhaust outlets on both engines. The throttle cable has been checked on the berth and the injection lever travels to the stop when the throttle is pushed to maximum. As mentioned before, with the throttles in neutral, both engines achieve 3,400 rpm which suggests to me the problem is not fuel starvation. The port injectors and pump were serviced by Powerdrive in Portsmouth and I spoke to our local engineer who removed and refitted the injectors and pump and he confirmed no sea trial was conducted after installation. Could the problem now relate to the turbo charger? I am no engineer and would really appreciate any advice / suggestions as to the next step.

You have a problem with the propeller size , quite a big one by the rpm stated .
you are 100 rpm too high under load , now imagine the other engine being ok , the revs under load would be even higher as the good engine e is doing the work which is heavily loaded .
Did your engineer hire the correct tools to re time the injection pumps , it’s quite a process on the 63 as specialist tools are quoted to set the flywheel in the correct position then set up the drive flange on the pump . It could be that the timing is way out causing the los of performance , in my option there is quite an imbalance .
When one engine is way down on rpm the other good one would not achieve its full rpm let alone exceed it by 100 in such a heavy boat .
you have other engine problems of which have not been identified at the start .

 

[scottie]

You have a problem with the propeller size , quite a big one by the rpm stated .
you are 100 rpm too high under load , now imagine the other engine being ok , the revs under load would be even higher as the good engine e is doing the work which is heavily loaded .
Did your engineer hire the correct tools to re time the injection pumps , it’s quite a process on the 63 as specialist tools are quoted to set the flywheel in the correct position then set up the drive flange on the pump . It could be that the timing is way out causing the los of performance , in my option there is quite an imbalance .
When one engine is way down on rpm the other good one would not achieve its full rpm let alone exceed it by 100 in such a heavy boat .
you have other engine problems of which have not been identified at the start .

I suspect that you have disregarded most of the comments made earlier and gone to the basic problem and what you are saying makes total sense
The number of times that jobs have run away with the hours because the ****** has been checked so it must be ok has proved erroneous and costly is beyond belief!

 

[Bandit]

Start with the very basics, as I said above before you spend big bucks . look for 2800 or 2850 max no more at wot.

 

[Portofino]

Why is the overloaded motor not reported to be bellowing black smoke ?

 

[kashurst]

Why is the overloaded motor not reported to be bellowing black smoke ?

because the fuel injection pump has a smoke control device.

 

[David435]

This is now becoming very confusing. As I stated in the first post, Volspec did the pre-purchase engine survey and were happy with the port engine at 2800 rpm and starboard at 2900 rpm. The difference between the two could have been the failure of the starboard sender unit within two days of purchase. The props have not been touched , other than a good clean and are original as far as I know. The injection pump and injectors were fitted by the engineer who I seem to remember telling me he had locked the engine to maintain the timing. Unfortunately I wasn't present during assembly due to the Covid travel restrictions. Currently at 2500 rpm on both engines the boat feels responsive and balanced with gentle application to the helm to maintain a straight course.

 

[kashurst]

the failure of the starboard sender unit within two days of purchase

what do you mean starboard sender unit?
If on a proper survey the engines were good when you bought it that would imply the props are OK as you haven't damaged or changed them in any way.
Either get the engineer back who did the injection pump repair/swap and see what they think and/or go through the simple easier things suggested on here.

 

[David435]

The rev counter works from a sender unit at the flywheel on this engine. I agree wholeheartedly to eliminate the easier and cheaper things first before progressing to employing engineers and dismantling engine parts.