Markone
New Member
Hello everyone, I'm new on here and am hopeful that somebody can give some advice on the above engines - Volvo TAMD63P 370. The boat is not mine, I have been asked to take a look at it for a friend. I have long experience working with automotive diesels, such as Gardner, Leyland, Ford etc so I am no stranger to engines, but as I'm not familiar with these Volvo's I thought it best to ask!
The engines in question have a problem in that they will not rev above 14 - 1500rpm when the prop is engaged.
They have had a mechanic look at them 5 times now, and he has checked so far: Props for foreign objects, air intakes (blockages, leaks), exhausts, control linkages for correct adjustment and changed fuel filters.
So they have asked me to take a look as they're losing the will to live with it!
The first thing I noticed is that both fuel priming pumps are leaking fuel when pressed, however when the engines are running they do not leak. I've always been taught that any leakage on fuel lines is not acceptable, especially on the suction side, as fuel out = air in. So we have ordered two new priming pumps to be fitted for a start.
This problem appears to have happened after they gave the boat a dose of injector cleaner. Before this the engines were delivering full power. Both engines failed at the same time, so I am trying to check things common to both engines.
It sounds to me that the required boost pressure is not being achieved and so limiting pump rack movement, maybe due to lack of fuel in the first place because of the leaking priming pumps?
My plan is to fit the new priming pumps, check the fuel supply pressure after the filters, and also check the boost pressure by fitting a T piece to the air supply for the smoke limiter.
Can anyone tell me what boost pressure to expect at 14 - 1500 rpm? The manual gives boost at WOT and something like 2200 rpm, but doesn't give readings for lower speeds / power settings. The engines will rev happily to the governor when unloaded.
Both engines sound well and start readily.
Are there any common failing points peculiar to these engines that can cause the above problems?
Thanks in advance
The engines in question have a problem in that they will not rev above 14 - 1500rpm when the prop is engaged.
They have had a mechanic look at them 5 times now, and he has checked so far: Props for foreign objects, air intakes (blockages, leaks), exhausts, control linkages for correct adjustment and changed fuel filters.
So they have asked me to take a look as they're losing the will to live with it!
The first thing I noticed is that both fuel priming pumps are leaking fuel when pressed, however when the engines are running they do not leak. I've always been taught that any leakage on fuel lines is not acceptable, especially on the suction side, as fuel out = air in. So we have ordered two new priming pumps to be fitted for a start.
This problem appears to have happened after they gave the boat a dose of injector cleaner. Before this the engines were delivering full power. Both engines failed at the same time, so I am trying to check things common to both engines.
It sounds to me that the required boost pressure is not being achieved and so limiting pump rack movement, maybe due to lack of fuel in the first place because of the leaking priming pumps?
My plan is to fit the new priming pumps, check the fuel supply pressure after the filters, and also check the boost pressure by fitting a T piece to the air supply for the smoke limiter.
Can anyone tell me what boost pressure to expect at 14 - 1500 rpm? The manual gives boost at WOT and something like 2200 rpm, but doesn't give readings for lower speeds / power settings. The engines will rev happily to the governor when unloaded.
Both engines sound well and start readily.
Are there any common failing points peculiar to these engines that can cause the above problems?
Thanks in advance
