Hi Steve, I run a 3GM30F with a Kanzaki transmission and had a similar issue.
The problem was a situation where the putting the gear lever in the full reverse position did not quite fully engage reverse on the transmission. The cable was somehow out of adjustment and simple corrective adjustment did the trick. If I remember right, the adjustment closest to where the actual metal cable exits the sheath was the right one to use / had much more range than the other near the shift lever on the transmission (I tried both). The fix: Move the trans shift lever all the way to the reverse stopping point by hand / adjust the cable until it pulls (Or push? ) it all the way to the stop as well. The Yanmar manual explains the operation of the lever very clearly, you can download online easily for free. I had also read that dirty trans oil could be a culprit as well so I changed that too. I read that even if the oil on the dipstick looks pristine, the bottom of the sump can be filled with gunk ( Mine was pretty bad) Unlike what you read on the internet forum, the oil recommended by Yanmar is regular motor oil. No need for straight weight either. When used in a variety of temps (I sail all year long) they recommend good ol' 10 W 30. The transmission oil change is a simple 20 minutes affair of putting a pan under the trans / removing the plug / drain / refill. That fixed it perfectly for me.. Good luck with it. Best regards, -Francois Rivard 1990 34+ "Take Five" Lake Lanier, GA >Hello all, Diamond Girl launched on the weekend. >All is good except for going backwards . . . > >It only kicked in when I revved the engine fairly high. >Happened two more times. So here is some back ground and my questions: > >Yanmar 3GM engine, exc condition, well maintained, 450 hrs. >Variprop 2 blade 7 years old, last relubed 2014 with spec grease, manuf >calls for every 5 years. >I did not relube this year, did not think it needed it. > >I also redid stuffing box packing this year, drip rate looks good but could >it be binding and not allowing tranny to go into reverse gear? I am not >familiar with the gearbox on this engine. > >Any thoughts on possible causes and fixes now that the boat is in the water? > >Thanks >Steve Hood >S/V Diamond Girl >C&C 34 >Lions Head ON Regards François Rivard 4111 Northside Pkwy, Nw Big Data Black Belt Atlanta, 30327-3015 IBM Sales & Distribution, Software Sales Usa Mobile: 770-639-0429 e-mail: jfriv...@us.ibm.com
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