46-47RH / RE冷却器和转换器流动
鲍勃沃纳克
The image of a target is often used in education or training. The bulls-eye is the topic of most importance. It’s what you “Need to Know,” with each consecutive ring or “Nice to Know” reinforcing or providing that information.
In this case, the bull’s eye, what you “Need to Know,” are the causes of the following:
- 740/1740 codes
- TCC slip at high torque
- Delayed engagements
- Slow converter fill
- 超速速度过高
- Hydraulic noise
Consecutive Rings Include:
Cooler Restriction
This is the by far the most common issue. Possible restrictions include the drainback fitting, auxiliary or radiator-mounted coolers or the lines. These restrictions not only reduce flow, seen as lube failures, but also negatively affect the converter and valve control.
This restriction (when TCC is not applied) reacts on the largest switch valve diameter, by forcing it toward the spring and positioning the valve as seen inFigure 1。您可以看到线轴如何阶段中路，进一步限制转换器和冷却流。这种效果随46或47 RH / RE冷却线而变化，并且可能成为近80 psi或更多的头部压力（参见Figure 2).
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The most effective verification technique is to temporarily bypass the cooler circuit and re-test. If you “hit the bull’s eye” and the problem is eliminated, track down your restriction.
Converter Restriction
A converter restriction may occur from any of the components pictured inFigure 3。If a converter has restrictions, it reduces cooler flow when TCC is not applied. Monitoring cooler flow from Drive at idle, through the completion of lockup, is an effective method to isolate a converter restriction. Low flow until the TCC applies and a slow application or slip/shudder on apply indicate the release oil is restricted within the converter. Release oil is the pressure holding the TCC piston away from the cover. Once TCC is commanded, that release oil must exhaust around the switch valve spool (second spool from left inFigure 1) and
through the valve body separator plate to ensure TCC piston will hold. (We suggest you review Ed Lee’s article, titled 740/1740 Codes and Chrysler Converter Flow in the September issue of Transmission Digest. These articles are interrelated, with data and targets being the same.)
Valve Body Issue
阀体是目标的下一个环，并且可以受到先前的冷却器和转换器限制的影响。压力调节器阀供应并保持转换器剥离油的调节，也是将成为TCC施加压力的源。通过噪音，高压或TCC滑移问题，检查阀门的阀体或箭头磨损
Figure 4。
Pump or Alignment
The pump and its alignment are the background for this target of information. The pump stator supports and aligns the turbine shaft with the center of the converter cover. On the opposite side of the cover bushing is the crankshaft pilot. The cover bushing centers the turbine shaft by way of the turbine hub, which controls the release oil flow. If this bushing or crank pilot is worn, the turbine shaft sealing rings may cross leak, which affects TCC apply and release oil.
Nice to Know
附加“很高兴知道”信息位于外圈。虽然不是要求，但这些数据支持投诉。图表中Figure 5has converter release oil pressure recorded from seven different converters. Converter 2 has the most restriction to flow; while converter 5 has very little restriction. Note the release pressure in Reverse. This elevated pressure causes hydraulic noise in Drive or Reverse and reduces converter fill and TCC apply, which leads to the slip codes or shudder. The chart on sump pressure (Figure 6) is derived from pump inlet pressure/vacuum testing with the same converters. Note the two converters to the left (3 and 6). Both have built-in restrictions to the flow of release oil.
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鲍勃沃纳克is vice president of technical development and a member of the TASC Force® (Technical Automotive Specialties Committee), a group of recognized industry technical specialists,transmissionRebuilders和Sonnax Industries Inc.技术人员。
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