speaker converter drainbackvalve body and pressure control solenoids. please contact your parts...
TRANSCRIPT
48 GEARS September 2010
In the ER (shop), we’re often faced with challenges that can cause us to become stress filled… if we
allow them to. When diagnosing symp-toms, the tendency is to over-evaluate what’s causing the patient’s ailments. Drainback or delayed engagements are conditions where a simple test can save hours of frustration.
In this issue of Doctor, Doctor, we’ll look at a simple procedure to help clear up those frustrations when dealing with converter drainback.
The first thing you need to do is answer 3 simple questions:
1. How long does it take for the drainback to occur?
2. Does the vehicle have to be sitting in a particular position (inclined with nose up or nose down?)
3. Where do the converter charge passages lead (reference a hydraulic diagram)
Once you’ve answered these ques-tions, you’re ready to perform the tests.
Drainback typically occurs through the lube return; you can often correct it by installing a drainback valve in one of the cooler lines. It isn’t always through the lube return; this is where a simple test will save hours of diagnosis.
Drainback can also be caused at any point of contact with the torque converter hub (figure 1). Some con-verter hub’s don’t have to be connected to the pump or pump gears directly; it could be a bushing pressed into the hub of the converter where it rides on the stator support (figure 2). Many
front wheel drive units provide good examples of this.
These areas include, but aren’t
limited to, the valves in the converter charge circuit (figure 3), the input shaft (figure 4) (bushings or seal rings),
Doctor. Doctor It Hurts When I Shift…
Dealing with Converter Drainback by Randall Schroeder
members.atra.comwww.atra.com
Figure 1
Figure 2
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50 GEARS September 2010
the converter hub and converter hub bushing, and the pump gears (figure 5) (depending on the model, inner pump gear face to cover clearance) (figure 6). Stator Support inner bushings (figure 7). Typically you don’t want any more than 0.003” clearance on these bush-ings, gears, or valves (based on hydrau-lic diagrams).
First things first: Verify the com-plaint and the time it takes for the drainback to occur. This is important: Is it one hour, overnight, or does the car have to sit for a week for the problem to occur?
Figure 3 Figure 4
Figure 5 Figure 6
Dealing with Converter Drainback
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52 GEARS September 2010
Once you know that, you’re ready to perform the test: You’ll need a suit-able place to leave the vehicle sitting for that amount of time. Here’s how to check for a drainback problem:
• Access the cooler lines and see if there’s a rubber hose or link in the lines. If not, install a rubber hose in the lines for testing.
• With the converter fully charged (vehicle has no delays in engage-ments), park the vehicle where it can remain for the test period you identified.
• With the engine off, clamp off the rubber line to prevent any oil flow through the cooler circuit (just one line is enough). I use hose pli-ers to do this (figure 8), but if you don’t have a pair, you can use two
wrenches and a pair of vice grips to clamp the line off (figure 9).
• With the engine off, remove the dipstick and mark the level of oil with a scribe (figure 10).
• Let the vehicle sit for the prede-termined time.
• Recheck the oil level before start-ing the engine. If the level has risen far above your mark, the drainback is inside the unit.
If the level is still correct after the testing period, remove the clamp on the hose and start the vehicle to check for engagements. If no problem is present, install a drainback valve in the cooler line, or replace the existing drainback valve.
Important: If you’re installing a drainback valve in a system that didn’t have one, make sure the inlet and outlet of the check valve are the same size or larger than the cooler lines. If you install a smaller check valve, you’ll reduce cooler/lube circuit flow, which can overheat the lube return oil or cause lube failure.
Remember, keep symptom diagno-sis simple to avoid hours of frustration. Until next time, keep those transmis-sions in good shifting health!
The Doctor…
Figure 7 Figure 8
Figure 9 Figure 10
Dealing with Converter Drainback
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