9/22/2023 0 Comments 35 cabo express fuel burn![]() That can be due to fouling, heavily loaded boat, sea conditions, whatever. The reason why I am asking is that the output of your engines is supposed to be in the 500 to 600hp ballpark, when spinning at 2000rpm at the typical prop demand curve, but they can actually produce almost 800 hp already starting from 2000 rpm, if that's what the boat (hence the props) demand. the gearbox instead, I am sorry and surprised to hear of the problem you experienced.Įven if your V10s are a bit more powerful and torquey than the V8s, they are still well within the 900hp 2300rpm the ZF350 are rated for.ĭid you possibly run the engines under heavy load at less than the max rated rpm? MYlover, if you don't mind me asking, what ballpark hours had you clocked by the time you had:Ģ) HP pumps and turbos needing reconditioning?ġ & 2 sound like pretty high hours items, and Scott Roush only mentioned the year but not the engines usage, in the boat he's considering. Good luck and don’t be scared of the MANs. Yes they are expensive to maintain but they have been very reliable for me over my ownership. MANs are just like all engines manufacturers in that they have some good ones and some crappy ones. Lastly the Mangrenade thing has been way overdone. I was told that the 350s were not well thought of but that is just my experience so perhaps my experience there is an outlier. The 350s are no longer made so I had both changed to 360s. Mapism’s knowledge far exceeds mine but I had the ZF 350’s and one of mine cracked its case (no hard strikes). I never hear that the heat exchanger looks clogged or scaled but I am told the real reason to do this every 3 years or so is to lubricate where some dissimilar metals touch. Also had my injector lines replaced as well. I had mine blueprinted and boost went up and EGT went down. My experience leads me to believe turbo reconditioning could be in the somewhat near future. That being said I would budget to send the fuel pumps off for a reconditioning (8K ea if nothing is wrong). I think most on this forum find my maintenance regimen extreme but it has served me well. ![]() I had to replace the torsional couplers on mine (25K for both Labor and materials). I have 12 years with V10 820s and would add the following. Should you go ahead and seatrial the boat, I for one would be interested to hear your impressions on the powerplant. Which is all well and good, but only as long as that pressure-sensitive valve is not stuck, otherwise air is not cooled as it should, north of 1400rpm or so, which is when the aftercooler really matters. In other words, the aftercooler is designed to actually warm rather than cool the air, when the engine is spinning at low rpm/load (in order to optimize combustion and reduce smoke). But the latter, which is the most important, is controlled by a valve that allows raw water to circulate only when sensing turbo pressure. In a nutshell, it's split into two sections: one of them feeded by the close cooling liquid, and the other by raw water. last but not least, it's worth mentioning that the aftercooler is rather peculiar. valves should be registered every 400/500 hours. ![]() Check also that there's no leaks around the side round covers of the HE, particularly those on the left side. heat exchangers and aftercoolers should be cleaned every 2 or 3 years/400 hours, though to some extent that also depends on where the boat is being used. injectors should be pulled and tested every thousand hours (though once you pull them out, it's also worth replacing their nozzles even if still in decent conditions, for not much more money - that's what I did, anyway) Usual maintenance aside, you should check the following: ZF350 was the most popular combo, which according to a ZF chief engineer is one of their best (if not their absolute best) gearboxes ever. Solid stuff, almost as good as the newer common rail engines but without the annoying occasional sensor faults, hours count going nuts, etc. ![]() V8/800 engines are the very last of the old school MANs, 100% mechanical. Click to expand.That's what I've got on my boat. ![]()
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