Art Posted November 10, 2018 Report Share Posted November 10, 2018 Can some one tell me on the 72 Alpina the fill hole that's almost under carb what is that for? And on the right side of motor is that the gear oil side?? And what do I use for gear oil and is that fill hole that's under care is that for transmission? Thanks Quote Link to comment Share on other sites More sharing options...
johnjsy Posted November 10, 2018 Report Share Posted November 10, 2018 Hullo Art, the under carb filler is for the gearbox, on a dry motor it needs 600 cc of 90 grade gear oil. I use Comma mineral oil. The filler on the side casting is for the clutch, use 300cc on a dry motor. If just changing oils then reduce the amount by about 50 cc. There are many different opinions for what to use in the clutch, many folk use Auto Trans fluid. That’s car automatic transmission oil. My feeling is that it does not lubricate the chain properly, so I use a straight 30 mineral oil at 25% to 75% of auto trans fluid. Someone posted on here that it worked well, so I am giving that a try as well. At the end of the day I am sure you have your own ideas on best, or worst !! Oils, you decide. Hope this helps..... 2 Quote Link to comment Share on other sites More sharing options...
section swept Posted November 14, 2018 Report Share Posted November 14, 2018 ATF will lube the primary chain and more importantly the sprocket and clutch hub teeth very well. The ATF in auto transmissions have bearings and thrust bearings that need lubrication to, not just the clutch packs so ATF has been formulated to deal with this requirement and to deal with very high temperatures as well. The only down side is that the clutch and primary chain may sound a little noisier than if lubed by a straight SAE 30 oil which would tend to have a quietening effect. Quote Link to comment Share on other sites More sharing options...
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