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原文：
My F250 runs like a champ. 725 hours, no hiccups. Plug Valves Purrs from idle to WOT of 6100 rpm's without missing a beat. Never really listened to the engine minus the cowl, but the weather has been cold and the motors been sitting for a couple weeks. Decided to go to the marina, start her up, and check the oil. I started it up, pulled the cowl off, and was waiting for it to warm up standing on the dock. Heard a quiet yet audible tapping sound. So, I went over to the motor, put my head back by the valve covers, and didn't hear it so much by the valves but could only hear while hanging over the motor so that my head was back by the ECM cover. Went up the control, popped her into Balance Valves neutral, gave her a little throttle and she purred. Took her for a run, no more tap? Again, not loud, quiet, but audible and only noticed when idling cold(will continue to keep an ear on it). Instrument Manifolds Did notice the injectors on these motors make some noise so it could Another noise that I hear(hard to describe) is a slight
原文来自： http://www.thehulltruth.com/shipyard-isl-marine-engine-parts/258330-valve-tap-f250.html

Valve tap? - F250;是由上海日美阀门制造有限公司提供的阀门新闻，中文译文仅供参考(上海日美阀门制造有限公司还生产柱塞阀鸭嘴阀水力控制阀过滤器低温阀门及楔式闸阀，弹性座封闸阀，消防专用闸阀，电动式弹性座封闸阀，信号闸阀，欢迎您的选购。)
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译文：自来水阀门
我的F250运行如飞了。七二五小时，任何阻碍。 Purrs从空闲到6100转不丢失一个节拍了什么事。从来没有真正听取减去发动机罩，但天气已经很冷，马达被几周会议。决定去了码头，开始她，并检查油。我开始起来，拉过的罩，并等待它热身码头上的地位。还听取了安静的声音窃听声音。所以，我去了电机，提出的阀盖我的头回来，没有听到它的阀门这么多，但只能听到，而在汽车悬挂，使我的头部被收回，流脑封面。到了控制，她进入中立弹出，给她一点油门，她purred。为运行了她，没有更多自来水？同样，不响，安静，而且声音和怠速时，只有注意到冷（会继续保持它的耳朵）。的确注意到这些电机的喷射作出一些噪音，它可以是一个注射器作出响亮自来水？我知道有这些阀列车没有摇滚的凸轮旋转阀上的权利水桶，所以不知道什么可以自来水阀门火车吗？每双顶置凸轮轴进口汽车我与阀噪声听说必要的调整更像是对响声，而不是自来水。另一种噪音，我听到（很难描述）是一种轻微的嗡嗡声/隆隆声，我想是飞轮转动？这该死的东西是如此安静的你听到的一切...

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