| Peder D | -- 08-24-2021 @ 11:26 PM |
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Hi all! Recently I noticed transmission oil leaking...closer inspection reveals oil coming out on top!? This must be coming up through the ventilation??? The transmission was nearly empty...filled almost a liter of 80/90 gear oil... Anybody else experienced this? What is the remedy, if any, without pulling the transmission...? Transmission was opened up in 2010 and seemed to be in good condition...however, some parts were replaced... The car is rarely driven and does not have many miles after overhauling... Appreciate any helpful feedback...thanks...Peder
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| 1931 Flamingo | -- 08-25-2021 @ 6:45 AM |
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Was/is there a puddle under the car?? IF it was filled when last repaired that's a lot to come thru vent hole. JMO Paul in CT
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| TomO | -- 08-25-2021 @ 6:48 AM |
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The transmission should be filled to about 1 cm below the fill opening. I check by inserting my finger in the hole and see if I can touch the gear oil. Over filling will cause some trans fluids to foam. Do not use the equivalent of GL5 gear lube. You might also look into using a 140 oil. The 80/90 may be too light in these warm temperatures. Tom
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| Peder D | -- 08-25-2021 @ 9:27 PM |
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Thanks Tom...you mentioned foaming...forgot to mention that...discovered after draining the "old" fluid...have always used the 80/90 grade gear oil...you mention overfilling...I remember as a young man working at a gas station...always used the finger to check the oil level, but sometimes you would top it off, thus overfilling, but have never experienced foaming or an overflow...maybe change to 140 grade (higher quality?)as you suggest...must admit I have used a low quality gear oil...I believe the original specs regarding gear oil states using 80 grade? Peder
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| TomO | -- 08-27-2021 @ 8:36 AM |
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Peder, I just checked the Ford suggested gear oil and they specify a mild Extreme Pressure oil of 90 W for summer in the transmission. All gear oils have some anti-foam additives and the cheaper ones may not have enough for the warm temperatures. Did you change the oil recently? Have you been experiencing the unusually high temperatures reported in other European countries this year? If the answer to these questions is "no", then look for another cause of this problem. Try sending an E-Mail to Mac Van Pelt at sales@vanpeltsales.com asking his advice. He has much more experience in transmissions than anyone on this Forum. Tom
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| Peder D | -- 08-29-2021 @ 11:06 PM |
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Tom, thanks for your reply...you write using 90W...isn't that basically the same grade as 80W? Back in 2010 when the transmission was "upgraded" a cheaper gear oil, 80/90W, was used. Since then the car has hardly been used, and only on very short outings. The leak was discovered "by accident" in conjunction with installing a new master cylinder. The rest of the oil was then drained, thus discovering the foam. The same cheaper oil was filled again, and I have been out for a relatively short drive since then...continues to leak. Inital inspection of the transmission reveals no leaks front or rear! I have now been advised to check if the vent cap is gone!!! If is is, how could so much oil be discharged from that little hole? It's worth mentioning that the "cheaper" oil has been generally accepted and used among old car owners. It's surprising that this oil has resulted in foaming! I will however contemplate using a higher quality oil now. As far as heat is concerned Norway has had a relatively warm season, but not unusual. I will try Van Pelt if a reasonable solution is not apparent. I will write again of my findings...thanks again! Peder This message was edited by Peder D on 8-29-21 @ 11:24 PM
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| TomO | -- 08-30-2021 @ 7:55 AM |
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Peder, can you read the label on the oil container to see if it has an API specification (GL-3 or GL-4). Valvoline sells a GL-4 80w/90 gear oil in Europe and that is what I have in my transmission. I don't know what you mean by "cheaper gear oil". If it has less extreme pressure additives, but is still a quality oil, it would be OK to use. I would not use an oil that has an API rating of less than GL-3. It would not provide enough lubricant for the synchronizers. The 140W oil is used when there are shifting problems in the older transmissions. The 90W has the same effective weight as the 80W/90 oil. Are you sure that the oil is coming from the vent and not a crack in the case? Try taping over the vent and then taking the car for a ride. This may prove that it is coming from the vent. Tom
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