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Car Forum / Driving, Maintenance, Tuning / General Car Topics / December 2006checking transmission fluid
When checking transmission fluid in an automatic it says to have engine hot and running. If i just want to get it close, by checking it while cold and not running, about how far off is the reading on the dipstick? I will assume that when its running the fluid level will go DOWN, not up, because its being circulated. Is this correct? The part I never totally understood is why it need to be hot????? Anyhow, just to get a roughly close amount with it not running or hot, how far off is the amount (a pint, quart, etc)? If it matters, this is a full size 1989 Chevy, 307 engine (olds type), and I believe the trans is a turbo hydramatic. Thank U George >When checking transmission fluid in an automatic it says to have >engine hot and running. If i just want to get it close, by checking [quoted text clipped - 4 lines] >Anyhow, just to get a roughly close amount with it not running or hot, >how far off is the amount (a pint, quart, etc)? Not running, the stick should show overfull. Be aware that the converter can drain down and give a 'false overfull' . This should be a safe OK-to-start and recheck point. Cold running will give a more accurate picture of oil level and should read about a pint (1/2 liter) low. The oil expands like crazy when hot and should come out about correct. Pete The reading on the stick can be more than 2" off when the engine is off and cold. They vary so there is no real way to tell unless you want to index it yourself. If it didn't vary when off and cold I would think the makers would have a mark on the stick for this. Because they don't, I don't think it can be a valid check. Mike 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00 88 Cherokee 235 BFG AT's Canadian Off Road Trips Photos: Non members can still view! Jan/06 http://www.imagestation.com/album/pictures.html?id=2115147590 (More Off Road album links at bottom of the view page) > When checking transmission fluid in an automatic it says to have > engine hot and running. If i just want to get it close, by checking [quoted text clipped - 11 lines] > > George | while cold and not running, about how far off is the reading on the | dipstick? Depends on the # of days gearbox has been idle : ATF level will rise when all ATF drips down to sump, after e.g. 10 days. | DOWN, not up, because its being circulated. Is this correct? yes | why it need to be hot? Honda says chk within 1 minute of switching off engine, 1 repairer says chk when engine is running, i.e. when ATF is hot ; when cold, more ATF will have dripped down to sump. > When checking transmission fluid in an automatic it says to have > engine hot and running. If i just want to get it close, by checking [quoted text clipped - 11 lines] > > George Virtually all GM (and all other) auto transmission dipsticks have instructions for checking fluid level printed right on the dipstick. If you don't do it that way, you will not get a correct reading. How the reading will be incorrect will vary with time, temperature, angle-off-vertical the vehicle is sitting etc., etc...all in the same vehicle. Follow the instructions or pay the price. |
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