| Author | Message | ||
| James J. McGee (Dr_ferrari)
Junior Member Username: Dr_ferrari Post Number: 123 Registered: 7-2002 |
True, the older shaft design was not the cause of the loose ring nut. Just poor torque and poor staking of the ring nut. The newer shaft was just a production improvement. and If there is damage to shaft or gears, best to upgrade to the newer type. Best regards, Jim | ||
| billy bob (Fatbillybob)
Member Username: Fatbillybob Post Number: 294 Registered: 8-2002 |
To my knowledge the problem was never the clutch shaft. The shaft only got bunged up if the gears slapped around fro a longtime and beat the shaft or there was a momentary lock-up under load due to teath braking off and jamming. The problem was no staking and or improper locktite/torquing of # 5 causing slappling of # 4 on #1. to get the shaft out you need to remove the throwout bearing house then put a puller on #1 to slide the whole shaft our with #2. It is best to use heat and the slide hammer. Also I woud use the inspectionplate first at the base of the transmission side of the bell house which means you have to take the clutch bell house off. | ||
| James J. McGee (Dr_ferrari)
Junior Member Username: Dr_ferrari Post Number: 121 Registered: 7-2002 |
The eariler 348/Mondial t gearboxes were prone to this condition. The Factory made a correction during the 1993 model year with a newer style clutch shaft that was to be much stronger. You need not upgrade unless you find damage to the shaft or gears. Just be sure to use red high strength loctite on the ring nut when torquing it to specification (22 daNM). Also, I would suggest changing the bearing during this service.  Best regards, Jim | ||
| steve coleby (Ferraridriver)
Junior Member Username: Ferraridriver Post Number: 77 Registered: 6-2003 |
Dr Ferrari It is a 1991 Mondial t Coupe Cheers Steve | ||
| James J. McGee (Dr_ferrari)
Junior Member Username: Dr_ferrari Post Number: 120 Registered: 7-2002 |
Steve, The noise you describe is the gearbox and most probably not the clutch. I would suggest at least draining the fluid and removing the most rearward cover pan on the bottom of the gearbox. Check to see for any metal or aluminum fragments and try to look inside at that rear drop gear set. I still am quite positive the noise is from that loose ring nut. What year and model is the car? Best regards, Jim | ||
| steve coleby (Ferraridriver)
Junior Member Username: Ferraridriver Post Number: 76 Registered: 6-2003 |
Billy bob Can you tell me how to do the Gearbox inspection? Thanks Steve | ||
| steve coleby (Ferraridriver)
Junior Member Username: Ferraridriver Post Number: 75 Registered: 6-2003 |
Thanks Jim The noise is not worse when accelerating or decellerating but when I hold a steady speed. would both of these sounds have the same cause clutch and gearbox? Is the steady noise the gearbox or the clutch noise? I am just trying to establish if the 2 sounds are actually one or two problems. please reply guys Thanks Steve | ||
| James J. McGee (Dr_ferrari)
Junior Member Username: Dr_ferrari Post Number: 119 Registered: 7-2002 |
Steve, If the noise is what I believe, The noise will get worse in time but may not be noticable (would be more apparent under acceleration or deceleration) Suggest that you address the problem now and not wait for it to get worse for the result could be costly to you. Best regards, Jim | ||
| steve coleby (Ferraridriver)
Junior Member Username: Ferraridriver Post Number: 72 Registered: 6-2003 |
Dr F I have had this noise for quite a while now. It does not seem to be getting any worse. would it get worse as time goes buy, or will this stay the same. This comment is mainly aimed at the gearbox noise not the clutch whine. Thanks again Steve | ||
| steve coleby (Ferraridriver)
Junior Member Username: Ferraridriver Post Number: 71 Registered: 6-2003 |
Hi Thanks everyone for your help. I have been analising the gearbox noise a bit more. When I accelerate or decelerate the whine seems to go or almost go. when I hold a slow constant speed. just enough to keep the speed fixed, the noise is much more apparent. I have been analysing the cluth whine also. The clutch whine seems to be louder when I have used the car for a while when it is hot etc. the noise is quiter when it is starter for the first time in the day. Any further comments please. Thanks Steve | ||
| billy bob (Fatbillybob)
Member Username: Fatbillybob Post Number: 293 Registered: 8-2002 |
Listen to Dr. Ferrari. BTW who are you Dr. F. This is the most intelligent post I have heard in a longtime. You know these cars. Anyway, the factory had a number of these cars and 348 where they did not stake down the clutch shaft ring. This allowed the gear to lossen and bang the transfer gear in the geabox and cause a gearbox teardown to repair. There is an inspection plate in the bell house where you can remove it to inspect both gears. Lok for funny wear and chipped teeth. You can use a mechanic stethescope right over the throwout bearing and perhaps hear the noise. It is very hard to distinguish the T/O bearin going bad from the gears going bad. However the difference in the noise is a clicking in the gears Vs. high pitch of the bearings. If you need to know who to do a more extensive GB inspection e-mail me on this board and I can tell you how to get the clutch shaft out with a cool trick and a home made special tool. | ||
| James J. McGee (Dr_ferrari)
Junior Member Username: Dr_ferrari Post Number: 114 Registered: 7-2002 |
Steve, The 348/Mondial t gearboxes have a problem where the input shaft gear fixing ring nut comes loose causing the noise that you describe. The gear in question is circled below. the clutch must be removed for access and the input shaft must be removed. Maybe best left to your local ferrari tech. Have it checked asap because a loose gear can cause major damage to the gearbox case.  Best regards, Jim | ||
| Steve Magnusson (91tr)
Intermediate Member Username: 91tr Post Number: 1933 Registered: 1-2001 |
Steve -- If your T uses the 348 gearbox (or something similar), this jpeg posted by Jeff B. might be useful in deciding where to look. (Unfortunately), it's got a lot of stuff in the intermediate area (from clutch to the 2nd shaft):  | ||
| steve coleby (Ferraridriver)
Junior Member Username: Ferraridriver Post Number: 65 Registered: 6-2003 |
Thanks Lawrence I thought they might be the same. I have ordered the parts so hopefully it will cure the problem. it comes as a kit, flange, shaft, bearing etc. �425 uk pounds too!! Steve | ||
| Lawrence D. Macedo (Macedoms)
New member Username: Macedoms Post Number: 28 Registered: 3-2003 |
Hello, When you depress your clutch pedal you are essentially stopping the mainshaft (input) from spinning. From what you've described, both noises are probably one in the same. This noise could possibly be a bearing or improper gear meshing. | ||
| steve coleby (Ferraridriver)
Junior Member Username: Ferraridriver Post Number: 64 Registered: 6-2003 |
Hi I am getting a whine from the clutch on my Mondial T. When I press the clutch in the whine goes away also when travellng along it appears that the gear box is making a whining sound also are these possibly the same sound/problem? I have been told that this is possibly caused by the first motion shaft this is the shaft that goes into the gearox has a bearing on the end of it and this may been worn or damaged. Any advice please guys Thanks Steve |