Volvo KAD 44P-C : a waste of power

Author Message   Jacques DELBOSC New member Username: ieroue Post Number: 1 Registered: 12-2006 Posted on Sunday, December 17, 2006 - 04:23 pm:    Hello, Owner of a boat of 27 feet equipped with the engine VOLVO PENTA KAD 44 PC I have had for several months a problem that neither the mechanic nor the local retailer Volvo manage to solve = the problem is as follows: The engine (bought in May 2001 and to date 550 hours) does not take power beyond 2700 turns. During starting, the compressor starts well as of 1600 turns then around 2600 turns the turbo one (sometimes, but keep not) and the compressor start again. One never manages to exceed 2800 turns with the dial (4000 turns are indicated there at this time by the tool for diagnosis) whereas the history of the engine, since acquisition, indicates to us that previously it normally had reached more than 3800 turns. What seems to us astonishing it is that the engine does not “brown smokes”. The origin of the intervention began when I realized that the temperature with the dial seemed higher than usually. The mechanic thought of the first access that it was about the pump with cooling sea water. Since many tests were carried out but the initial defect remains the same one: the engine does not take power and like undoubtedly it bolt, the temperature approaches the limit. No error code appears with the button of the station of starting, nor with the tool for diagnosis. The various tests were carried out while carrying out the following modifications successively (listed chronologically): - replacement of the impalor and revision of the coolant pump sea water, - change of the supply pipes of the fuel oil, - replacement of the fuel oil of the tank by a jerry can of 30 liters, - passage to the round of applause of the injection pump, - replacement of the 6 injectors, - replacement of the injection pump, - test with a new electronic control unit, - test with a lever of new order, - test with a new compressor, - replacement of turbo, I ask you to excuse me for my request of assistance but it would be pleasant for me to know: - if you were confronted with a similar problem and which solutions could be found? - if there are forums of private individuals or professionals where I could usefully expose my problem. In advance I thank you.   scott stephens Advanced Member Username: scott_s Post Number: 295 Registered: 05-2006 Posted on Sunday, December 17, 2006 - 06:14 pm:    aftercooler possibly blocked? here in the states, I would take it to a radiator shop for cleaning. what oil are you using?   Capt William Myersl Visitor Posted on Sunday, December 17, 2006 - 06:17 pm:    Intake volume is very important to build turbo power as, well as exhaust free flow. If the engine room is air tight, the air intakes are to small this will stop the engine from making power. If possible try an engine test with hatches open. It is also possible if this is a computer controlled engine that the soft ware is defective. If this is a mechanically controlled engine check the injection pump timing, if its off the fuel is not building up in volume as the rpm comes up so your getting a lack of volume starving the engine.   Niall O Flaherty New member Username: alt Post Number: 2 Registered: 05-2006 Posted on Wednesday, May 16, 2007 - 02:44 pm:    Hi, I had the same problem with my engine, KAD32. The tachometer said that I was only getting 3000RPM when I should have been getting 3800RPM. I looked at all the expensive things, props, turbos etc. It turned out that the tachometer was not configured right for the engine. The job only took 5 minutes to do and all you need is to be able to gain access to the back of the tachometer. This may not be your problem but it's worth a shot! Let me know how you get on, find attached the info you need   Niall O Flaherty New member Username: alt Post Number: 3 Registered: 05-2006 Posted on Wednesday, May 16, 2007 - 02:46 pm:    I forgot to mention, the reason that your engine may be over heating is because the engine could be over-revving, but you don't think it is because the tachometer is not configured properly... My engine was over-heating, because eventhough the tachometer said it was running at 3000RPM, it was infact running at 4000RPM, and the max should have been 3800RPM. Thankfully I only ran at that speed for a couple of minutes and didnt do any damage   jaydoubleyou Visitor Posted on Sunday, November 04, 2007 - 08:27 am:    Check the exhaust for back pressure. It may be preventing the turbo spinning up properly and perhaps there is also a water problem there because the raw water exits at the exhaust. Too little outflow will cause overheating.   ryn Visitor Posted on Wednesday, March 05, 2008 - 09:47 pm:    i had this problem...follow the pipe from the compressor to the turbo...there should be a join where the two pipes meet...there will be a rubber hose connecting the two pipes check if there is a hole in the hose...i hope this is your problem   Harold Wallace New member Username: captharold Post Number: 1 Registered: 05-2008 Posted on Tuesday, May 20, 2008 - 11:51 am:    I just had the mechanic here with a problem of only spinning up to 3200rpm's at WOT. It use to spin up to 3900 with no problems. Now it does the above and overheats at the 3200rpm speed. After doing all the normal checks, ex: air filter, fuel filters, compressor and turbo pressures, props, bottom etc.. it was found to be pointing toward the injector pump timing. He is to return to determine the timing and have the pump sent off even if the timing is ok to see if it is defective. This is due to wear, as I understand, and a new pump should take care of the problem and return my power band back to where it was. Now I need to find a new pump that wont cost a arm and leg.

Administration Log Out   Previous Page Next Page