Search Index: Transfer Case Gear Cover While attempting to remove the engine from my GT4, I removed the transfer case cover, because I needed the extra room to move the engine sideways. When I removed the cover, I discovered that the lower gear (the one that goes to the transmission) either is, or at some previous time had, been scraping agains the cover. (see picture below). What does this indicate? Is there a bearing, or bushing somewhre that might be extremely worn, or perhaps missing? Thanks for your help. Image Unavailable, Please Login
Mine had this too. It is likely that the ring nut slipped and allowed the gear to move outward at some point in the past. This is the reason that you should replace the ring nuts whenever you remove them, and then peen the mother really well when re-installing. Birdman
Thank you Birdman! BTW, is this something that makes a LOT of noise when it happens, or is it a subtle noise? Like something that might be mistaken for differential noise?
Since the gears are running in an oil bath, it'll be fairly quiet. The drop gears tend to whine a bit anyway, so it would be hard to notice unless you were used to what it normally sounds like.
Verell, Thank you. I've thought that this engine was a bit noisy. But I only have my friends '88 Mondial (cabrio), and one other very rough coupe I drove, to compare to. So I can't be sure. Once I succeed (failure is not an option) in pulling the engine, I'll probably look at the differential too, since that is where I assumed the bulk of the engine noise was coming from in the first place. But mabye this too, was contributing to the noise. Looks like I'll need to find that ring-nut tool too, unless there is another non-ham-handed way of getting it off. .....???? Once again, Thank you very much for all the kind help. -David
Nope, You really need the proper tool, that ring nut is on with a lot of torque. You might be able to grind one out of a 10-point impact socket, but make sure it fits very tightly in the slots, any slack & you'll either break the tool or the nut. Sources of the tool are: 1) Baum Tools www.baumtools.com It's around $100 2) Hill Engineering, a Fchat sponsor.
Not sure. Mine did it to the PO and I discovered the "repair" to the inside of the cover (gobs of JB Weld) during a clutch change. I'll post a pic, it's 100 times worse than yours. I replaced the mangled gear AND transfer case cover it was so bad. Birdman
And, along with the peening, I used some blue (I think?) loctite when installing the ring nut. Also, the special socket designed for that ring nut works beautifully. If you think you will ever take that ring nut off again (use an impact gun), just get the tool. Installation (high torque- 130 ft/lbs) is a snap with it too- just lock the gears with a rag and grab a big torque wrench. Or, lock the flywheel. As for the damaged cover, have you drained the gear oil already? If so, were there flakes of aluminum? Just trying to figure out when the damage may have occured. Will the trans pan be coming off soon? Look for indications in there also after removal. good luck jwise
jwise, Thank you. Yes. Knowing when it happened would be of great comfort. Unforunately, I think I'm well beyond being able to determine that now. There was only a very very tiny bit of grit on the gear drain plug. It came off on the rag when it rolled over in my hand, and I posted a pic of it in the "syncro fix" thread stating, "it felt kind of like 220 grit.". But I'm not sure that grit from the transfer (or dropdown gear?) cover can get that far into the gearbox anyway. Can it? Also, I didn't know that the cover would be full of oil. So when I pulled it off, it made a big mess on the ground. At the time <sarcastic grin> I wasn't too worried about any oil, or saving it. So it could have been in what came out of the cover when I pulled it off. BTW: the <grin> is not directed at you, but rather at me. See this and you'll understand why: http://www.ferrari101.com/forum/showthread.php?t=113587 That'll also answer you last question.
Yes- the transfer case and gearbox share the same oil. The aluminum flakes would end up in the gearbox also and settle in the pan. I see from you attached post that you are having quite a time of it!! I've attached how mine looked when removed. Looked like very small brass particles. Similar to your findings? Image Unavailable, Please Login Image Unavailable, Please Login
