4R100重复转换器故障

这篇文章的一个好字幕可能是“底线疼痛”。你可能已经听过这个短语，“没有痛苦，没有收获”，其在物理调理或教育中往往是真实的，但我们更愿意与之相关传播rebuilding. In this field, the pain – and education – comes in the form of a comeback. It hurts the bottom line to rework or repetitively give up expensive parts. We are referring to both the cooler line and profit line.

在这节课中,我们将听到的4R100.在2000年,7.3 diesel with repeated (four times) converter failures.

This is an experience that once learned is never forgotten. During final test drive you notice the TCC apply seems longer and softer than normal in a 4R100. If you deliver the vehicle it may return due to overheated fluid or converter codes 1728 or 1744. Avoiding further diagnosis and swapping converters or coolers can increase the anxiety, as the vehicle returns to the shop after another week. This starts to get your attention. HD converters, new fluid and labor have dissolved the initial profit, so now it’s time to figure out what’s causing this.

问题是什么？

当发动机输入扭矩增加时，TCC活塞没有足够的压力来减少滑动。任何电路限制在4R100与开关中的调制TCC上更为关键E4od.，由于TCC控制阀孔的尺寸和位置。

To explain the problem we could compare the converter to a hydraulic jack. The cylinder will only move as fast as the fluid fills or is allowed to exhaust. With a jack, the handle or bleed screw is the control.

In the 4R100 converter example, the piston travel is controlled by the exhaust of fluid past the turbine hub. If too close/restrictive, the release oil will slowly exhaust as the TCC piston forces the oil out (see图1).

There can be other issues affecting the apply and release of the TCC piston. In descending probability, they would include: the bypass checkball leaking or stuck open (which is external to the transmission), poor pump volume or modified pump orifices.

为什么这发生在4亿？

On the modulated converter circuit of the 4R100, the fluid coming from the TCC regulator valve goes unrestricted to the converter apply piston (see图2). As the TCC solenoid modulates the control valve, the release oil between the piston and the cover exhausts without an orifice. The apply oil now gets priority toward the piston and is restricted toward the cooler direction. To illustrate the theory, we could use a river’s spillway gate, controlling the water to take an easier path toward a generating turbine. Another example could be the garden water hose. You can see a head pressure spike from a leakage point as you step on the hose.

In the 4R100 converter the piston gets priority pressure due to the orifice and the cooler receives less pressure and flow. If the orifice hole is increased, the TCC piston gets less pressure, but the cooler receives more flow. In this case, less pressure to an overtaxed TCC piston is not a good practice. Likewise, making the orifice smaller increases pressure at the TCC piston, but reduces flow to the transmission lube circuit. The E4OD by comparison, has an exhaust orifice and apply orifice with its on-off control of the torque converter clutch.

现在我们添加了外部压力旁路电路。这种球，座椅和弹簧设计为在约60psi的冷却头压力下打开，以确保润滑油流动围绕限制的冷却器。抛开图表，文本和图形，认为散热器和旁路作为另一个人站在花园软管上。

How to Isolate the Problem:

同时检查冷却器流量和头部压力是如果出现问题，可以隔离的最佳方法。如果您无法监控流量，请至少检查头部压力（参见图3.). On the 4R100 cooler test graph (seeFigure 4), note the two units Alt1 and Alt2. Both had restricted converters. There is minimal difference in flow (see GPM flow rate at far left) during lockup and head pressure (see psi flow at far right) does not rise to normal. Normal specifications are the last example shown. The Lot test OE example is from pre-repair, with an unrelated problem. The Alt4 test is using the converter from Alt1 and improving the oil flow, then installed into the same truck. Alt3 is a used OE converter installed into same Alt1 truck. The other bar graphs are testing various stages with bypass closed or open to isolate it.

Can We Apply this Information to the E4OD?

Even though the converters may be similar or the same, the hydraulic control is different. The orifices that control the flow to cooler vs. the converter apply differ between the two units. You can verify this by comparing cooler flow on both types of units.

当没有应用TCC时，E4OD将具有更少的较低的流量;流量随着TCC命令急剧上升。平均E4OD冷却器流量，3RD的TCC未施加为1.2至1.4GPm，TCC指令时的1.8至2.0GPm。它几乎与4R100相反。在TCC期间，带有调制转换器控制的4R100适用，锁定前更大（参见图表）。E4od也没有外部压力旁路。这使得E4OD更容易诊断。您可以通过寻找流量或压力的上升来识别TCC螺线管命令何时适用。然后你知道涂阀已经抚摸。

Knowing how these circuits are interrelated is like having the answers for a geometry exam before you enter the class. For this lesson, the 4R100 TCC test answers have been compiled here, so all you need are gauges and your garden hose as a reminder.