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Basic ATF Thermal Expansion Question
I know that ATF level is very sensitive to fluid temperature....my understanding was that that was due to the thermal expansion of the fluid. Yet I notice that the HOT ATF that I extract is at the same level in the extractor the next morning when it's COLD....i.e. it doesn't seem to contract. What am I missing? What accounts for the difference in level if not the actual volume of the fluid?
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14 E250 Bluetec "Sinclair", Palladium Silver on Black, 153k miles 06 E320 CDI "Rutherford", Black on Tan, 171k mi, Stage 1 tune, tuned TCU 91 300D "Otis", Smoke Silver, 142k mi, wastegate conversion 19 Honda CR-V EX 61k mi Fourteen other MB's owned and sold 1961 Very Tolerant Wife |
#2
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Quote:
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Grumpy Old Diesel Owners Club group I no longer question authority, I annoy authority. More effect, less effort.... 1967 230-6 auto parts car. rust bucket. 1980 300D now parts car 800k miles 1984 300D 500k miles 1987 250td 160k miles English import 2001 jeep turbo diesel 130k miles 1998 jeep tdi ~ followed me home. Needs a turbo. 1968 Ford F750 truck. 6-354 diesel conversion. Other toys ~J.D.,Cat & GM ~ mainly earth moving |
#3
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No....the fluid that I'm talking about is no longer in the car....it's sitting in an extractor. The volume is the same whether hot or cold. So I'm wondering what is meant by the thermal expansion.
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14 E250 Bluetec "Sinclair", Palladium Silver on Black, 153k miles 06 E320 CDI "Rutherford", Black on Tan, 171k mi, Stage 1 tune, tuned TCU 91 300D "Otis", Smoke Silver, 142k mi, wastegate conversion 19 Honda CR-V EX 61k mi Fourteen other MB's owned and sold 1961 Very Tolerant Wife |
#4
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Is "hot" at ambient temp (+/-100F) sitting on the floor in your garage, or are you heating the stored fluid to equal actual 80C operating temp and then looking for the change in volume?
Going from 60F to 100F would be a minimal % increase temp and corresponding expansion. If you are going from 60F to 80C that's an ~300% increase in temp. To actually see the diff in expansion you'd probably need a sealed container with a small diameter clear tube that the fluid was forced to expand into. That would approximate what is happening inside your trans when fluid is measured cold vs hot.
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Terry Allison N. Calif. & Boca Chica, Panama 09' E320 Bluetec 77k (USA) 09' Hyundai Santa Fe Diesel 48k (S.A.) |
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