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5 speed manual trans issues
Hi everyone. I have a problem with my '83 928S 5 speed manual trans. What is the culprit if 2nd and 4th gear pop out of gear? What is the problem when downshifting normally and it grinds? And what is the issue when moving the gear shift level back and forth, and it sticks a bit? I love this car, but the transmission makes it so its not that much fun.
thanks for anyone's help. john
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1980 928S Euro 1983 928S 1988 928 S4 1989 944NA |
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12-23-2006, 08:37 PM
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Banned
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Sounds like you need a trans(or a full rebuild). This is pretty much a huge job in a 928, so be prepared to spend a LOT of money to fix it.
The guy that owns the below forum(his screen name is "P") had his 83 5spd done. He can tell you exactly what's involved. Good luck! http://www.network54.com/Forum/426130/ |
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12-24-2006, 12:27 AM
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Thanks Sniper. I was hoping it was simply a clutch, pressure plate, throw out bearing deal to solve it. I believe it needs these items anyway. I wonder if it'd be just as easy to replace these first, then see if i still need a complete trans.
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1980 928S Euro 1983 928S 1988 928 S4 1989 944NA |
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12-24-2006, 09:55 AM
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Keep an eye out on all the sites for someone parting out 928s, that'd be your best bet to get a good price on a trans. Also, you might want to research the gear ratios, cause many different model years had improved synchro designs and different gear ratios. Mark Kibbort on rennlist is an expert in these matters, i'd definitely reccomend you seek him out and ask for advice on what year trans to search for. This would also be a good time to upgrade to a limited slip transaxle if you don't already have one, as it is part of the transmission assy itself.
Sorry to be the bearer of bad news, but look at the bright side, when you're done, you'll have a brand new trans!  Good luck. |
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12-25-2006, 08:41 AM
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You should look into the condition of the shifter components andmake sure all adjustments are in spec. 2nd and 4th are at the same end of the gate, a worn ball cup bushing may be preventing full engagement, likewise a mis-adjusted throw may have the shifter physically binding on the front throw.
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12-26-2006, 04:59 AM
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That won't make the 'gears grind' though. The grinding is a symptom of worn synchronizers.
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12-26-2006, 08:58 AM
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It can; if the gear only "feels" engaged on a downshift but isn't fully, it could be popping loose as the clutch is released. On most transmissions the cut of the gear teeth tends to pull or hold the gears in mesh under accel, but loosens that grip somewhat under decel. (try pulling your car out of gear without clutching on accel then decel). My thinking is that worn synchros would be noticable running both up and down the gears.
Not sure exactly how bad John's car feels, but I felt the same way about the trans on mine, and had resigned myself to having to rebuild it since the early cars have so many synchro problems. Finding a clutch problem led to a new and properly adjusted clutch set, and while I was there it got a new ball cup and full shifter adjustment; all the synchro problems vanished and the sluggish shifter is more precise and notchy now. WHat I've found out since is that the front disc tends to drag slightly when the central plate gets out of adjustment, I used the adjustment in the manuals, but they say Devek has a slightly different method thats better. |
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12-27-2006, 07:37 AM
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THat isn't to say that synchros aren't the problem...just that the easier (cheaper) fixes are worth a try 1st.
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12-27-2006, 07:39 AM
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Your explanation is reasonable. Hopefully that's 'all' it is. I don't mind being wrong.
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12-27-2006, 09:37 AM
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Heavy Metal Relocator
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I was curious about your diagnosis.
Have you bled the hydaulic clutch?? Are you having issues where the clutch pedal goes to the floor properly but fails to return to it's full up position after you make the shift? Are the hydraulic parts original? Just a few other items to check, and maybe it will help. Replacing/servicing the hydraulics are a damn sight cheaper than swapping trannys....."IF" that is where the problem lies. My PO gave me his run down of 1,2,3 gears shot, clutch shot, etc.... Turned out the clutch system just needed to be bled. everything works fine now, except when you run up the rpm's for a few gears, then the system acts up again. Replacement of the clutch hose (the hose from frame to slave cylinder) and the 2 cylinders (master and slave) will take care of this problem. As with most of these cars, there's no telling how they've been cared for (or not), how they've been driven, etc...... Keep us posted as to your progress. regards---rhjames
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Absence of Evidence, is not Evidence of Absence. Bill Maher 8/4/09--- "I'll show you Obama's birth certificate, when you show me Sarah Palin's high school diploma." |
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12-30-2006, 08:40 PM
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