| Author | Message | ||
     William C. Leek (Onionman) Member Username: Onionman Post Number: 95 Registered: 07-2002 |
I changed the transmission fluid in my Discovery this weekend. The dipstick had a printed warning against overfill. What is the problem with overfill? Is it the same as overfilling the engine oil - taking a chance on creating air bubbles? How much is too much overfill? | ||
| John Cronin (Jec) Member Username: Jec Post Number: 74 Registered: 02-2003 |
Can't tell you what will happen; I've always assumed death and destruction - maybe someone else can chime in. I know ours slobbered out the breather pipe when it got hot when it was only slightly too high and we were climbing 8% grades. If it's not between the two holes on the dipstick when parked on a perfectly level surface when the engine is stone cold in the morning and then you check it in park or neutral after first starting the engine and running through each gear for a few seconds, I would (and have, once in the past) drain a little out. It's not too messy if you do it when the fluid is cold, and don't remove the drain plug; just loosen it to where it would come out, while applying pressure to hold it in place. With your other hand, hold the drain plug up there to catch the spray. My recollection is that the distance between the two holes represents about 1/2 quart, so you can judge how much to take out. Remember also that ATF has a tremendous coefficient of thermal expansion. I last filled ours to the low hole in April at about 50 degrees, and now at 75 or so it's at the top hole. |
