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Thread: CAT 3516 problems

  1. #1
    dirwood is offline gCaptain Crew
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    Default CAT 3516 problems

    I am curious if any engineers on here work with 3516's and if so are you having trouble with dropped valves, and excessive valve recession. The vessel I work on has high displacement 3516B's for mains and we are experiencing a lot of valve issues, mostly with the intake valves. We are doing valve lash adjustments every 1000hrs just to stay ahead of the wear. I would be very interested to hear from anyone who has seen similar problems. <br><br>Thanks,
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    tengineer is offline Top Contributer
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    I am assuming you are replacing valves,seats and checking all the normal stuff. If so who is supplying the parts? Is Caterpillar doing so? If they are you should contact them. They are going to tell you to check your intake air for proper filtration and want you to check normal stuff like gov. settings, fuel air ratio control etc, tell them you prefer they do those tests and provide results in writing. If the problem persists tell them you are wondering about the quality of the metal in the seats and valves. Tell them you are considering sending samples to an independent metallurgical testing facility for tests. <br>Engine manufacturers subcontract a lot of their fabrication of parts and sometimes the quality control at the subcontractors is sub par but most engine manufacturers appreciate their attention being called to a recurring problem. Give Cat headquarters in Illinois a call if the problem continues.<br>Good luck.
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    tengineer is offline Top Contributer
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    Correction to dirwood,<br> Talked to the best 3516 guy I know after he appeared on my patio looking for a steak. We are both only accustomed to the 3516 being used as an auxiliary generator but it's still a Cat. Problem is probably not the seats and you probably do not have the means to machine them anyway. As usual you need to think 1. what has changed? [load swing or increase etc] 2. when did the problem appear? 3. do they correlate? It's a step by step process as I am sure you know. We both agree everything else I said before stands.<br>Best of luck.<br>.
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    injunear is offline Top Contributer
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    <P>Our gen sets are 3512's. Different application as they are constant speed with load sharing. We have had no top end failures.<br><br>My first question was Cat or after-market parts? Has lube samples indicated anything? Lube compatibility? Fuel quality? After cooler? Shutdown damper fully reset? Happening on both banks? Injector trim codes properly entered?<br><br>Also, with the smoke mapping program on the 3600 series, I have run across critical RPM ranges where turbo inlet/outlet temps go through the roof. <br><br>Electronic diesel engines......My old Chief is flopping in his grave! Give us more info and good luck!</P>
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    dirwood is offline gCaptain Crew
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    <img alt="" src="http://gcaptain.com/maritime/forum/extensions/YUIEditor/img/1931219381326.jpg" _height="75" _width="75]<br><br>This picture is of intake valves from the same head, they had 8000hrs on them. Note the difference in wear.<br><br>All parts are CAT, no after market stuff. After inspecting the heads removed during the first top end it was found that all the upper intake valves were recessed .030-.065. Both exhaust valves and the lower intake measured the same, showing normal wear. Now with only 4000-5000 hrs on the new heads we are seeing excessive recession, again only on the upper intake valves. Oil samples done by CAT SOS labs all come back good. We are using Chevron DELO 15w-40 for lube oil.
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    tengineer is offline Top Contributer
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    What does Caterpillar say when given this information?
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    dirwood is offline gCaptain Crew
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    <P>CAT claims it is with in tolerance and normal for the hours/fuel used. I find that hard to believe. I recently spoke with a couple CAT service technicians and they both said they have noticed they are making a lot more intake valve lash adjustments when performing tune ups for customers than they did with the older engines. </P>
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    tengineer is offline Top Contributer
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    Send a letter either FedEx or registered mail with delivery confirmation requested to Caterpillar in Peoria Ill. detailing all the information you have and the problems experienced. I have used the address for Investor Relations for things of this nature, that usually results in it getting properly routed. Tell them you are concerned for Caterpillar's reputation. Include in your letter problems including loss of money caused by down time and ask them if they have decreased the quality of the material in their valves recently or changed suppliers. Offer to send them an old valve that had 8000 hrs on it and a more recent one that only lasted 4000 hrs so they can have a laboratory examine them. <br>See what they say. Believe me they will respond. Let us know how things turn out.
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    injunear is offline Top Contributer
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    Sounds like a good game plan with Wartsila cutting into Cat's high speed engine market.<br><br>I haven't seen this much wear on our gen sets. The only problems I've had are engine driven pumps, dampers, and the odd injector. <br><br>The biggest complaint I've had with Cat was in the transition and modifacation of the 3600s to the full electronic version. We're still having a hard time getting the latest parts and parts manuals.<br><br>I'm still curious how the warranties will play out with the "fuel burned" being the measurement.
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    tengineer is offline Top Contributer
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    Injunear,<br>Wartsila is currently a better engine among the medium speed engines in my opinion [though the cooling system is over complicated]. I know Cat has had problems with parts manufacturers and will correct the problem if it's brought to their attention. Who knows? Maybe they asked ISO certified Moo Goo Gai Pan metal manufacturing over in China to make valves for them. ISO certification means little now a days. I see this stuff all the time.
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  11. #11
    Johnny Sweden is offline Just Browsing
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    Default Re: CAT 3516 problems

    HI all Cat engine users, I'm Johnny Pettersson and i work as a Gearbox expert resently from Vestas Wind SV AB.
    You are taking about a problem with the Cat 3516 engine that i feel we can have a problem solution for.
    1:st There is a problem with the oil, how many hours are you runnung the oil?
    2:nd How fine is the filtration of the oil ?
    3:rd If there comes to a repair ,there is a company in sweden that specialise on plasma welding marine diesel engine valves and refurnice these to a new valve with a much stronger surfice.
    ( I don't know at this time how big these valves are and if there is a economy saving to repair the valves)
    however ther is a solution to the oil problem..
    It's called Europafilter and you can read about at www.itsab.com
    or www.europafilter.com
    They have achived some miracles on the market with both filtrations of the oil and ofcause filtration of the fuel.
    The filter system cleans down to 0.1 microns and it removes 98,3 % of all water content in the oil / fuel.

    I'm always avalible for a conversation at my E-mail johnny@itsab.com
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  12. #12
    smetshouse is offline gCaptain Crew Greenhorn
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    Default Re: CAT 3516 problems

    I worked as a Cat mechanic back in the 90's and we had some engines that were doing the same thing.... except it was exhaust valves that were "growing" we kept having to adjust the valves... and then change the heads way ahead of normal conditions... We finally found that the engine was overloaded by about 15% above factory guidlines. Have you added equipment to the vessel? New props? Check exhaust temperatures? What are they at full load, speed? How about stack condition? any smoke? if so what color?
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