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#1
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For everyone with Trans issues - tried cleaning the valve assembly?
My friend recently has his Jaguar's ZF trans acting funny; staying stuck in gears, hard downshifts, "rear end bang"... behavior that had been reported on our X5 transmissions. He opened the valve body and found that the passages we being choked by the 'dirt' in the fluid. A regular trans flush/fill would not have cleared this out. Keep in mind, this is not the exact same transmission. However, the photos show a representation of what's inside our trans. Pics attached: |
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#2
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A transmission specialist giving a proper service would remove and clean the valve block using a dedicated and clean parts washer and dry off with compressed air , blowing air through all the channels and thoroughly inspect the block to ensure it is clean .
this should be done in a clean environment ensuring no dust or hair enters the block . |
#3
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Valve bodies are known to be the cause of many BMW transmissions faults, but dealerships cant diagnose that kind of stuff. If one were to DIY a valve body removal and cleaning, valve body gaskets and seals are not available through the dealer and almost exclusively found at transmission shops. Without the manual specific to the transmission being worked on, many key things could be left out when assembling or disassembling a valve body. Also, what would be used to clean out the passageways? Brake cleaner? Sometimes its not the greatest idea to use such a cleaner.
Its just a littlle bit more involved to service a valve body. I guess if some were interested, I could post a DIY on a valve body removal for the 5L40E transmission. |
#4
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#5
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yeah charlie , give us some pics please .
I don`t remember the name of the fluid used to clean the valve block but I think it`s the standard stuff used in parts cleaners , a steel basin and spashback with a flexible pipe sitting on top of a 30 gallon drum of cleaning fluid . best to let a specialist do a transmission service because they would know the condition of the transmission during inspection and could advise there and then if a rebuild is needed . |
#6
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Bringing it to someone familiar with transmissions is a good idea.
I'm sure some could sucessfully clean a valve body and reassemble it, but certain things to inspect might be overlooked. Its not only the fluid paths that need to be cleaned, but check balls should be inspected, valves and springs should be checked, solenoids should be tested, accumulators should be checked and rings replaced, and other sensors/plugs checked. A refurbished valve body job should run anyone upwards of around $400 including parts and labor, assuming you pulled it from the transmission yourself and will do the reinstall and refill of fluid. |
#7
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#8
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Too bad you don't have pictures of that Jag's before and after.
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#9
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The were many little balls and springs in the valve body and if you don't take these tings apart in the right way I can see how you would lose track of them easily. Sliding the middle plate out rather than lifting it straight off helped to keep all the things in place. |
#10
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I would expect that when cleaning out the valve body, an overhaul kit is utilized that includes all gaskets, check valves, spool valves, etc. A typical ZF kit is shown below.
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