paul123
Well-Known Member
- Thread starter
- #1
for you MT82 owners out there, who might need some light reading material for your Christmas :cheers:
the lines below are just snippets I lifted from the article to serve as Cliff Notes
http://www.rsgear.com/blog/2011/5/23/understanding-and-analyzing-manual-transmission-failures.aspx
Understanding and Analyzing Manual Transmission Failures
Posted on: Monday, May 23, 2011
... The most abused components in a vehicle are the clutch and the manual transmission as these components are completely at the mercy of the driver.
The road to ruin begins with the clutch.
Whenever you see the steel keys broken or sheared off, there can only be several causes. The first is improper or no clutch release, driver error where the clutch is not released or trying to shift without using the clutch or a driver that is moving the shift lever before the clutch has released, rushing the shift.
Another point of early transmission failure is the wrong choice of clutch for the application. This usually begins with the idea that installing a performance clutch will improve the vehicle performance.
Another cause of transmission failure is lubrication. Everyone knows that lack of lube fill due to leaks or lack of maintenance is the kiss of death for any component, but the type and quality of lube is very misunderstood.
Always be sure to use an oil that is specified for the model of trans in the vehicle.
The amount of lubrication is also critical for shift timing. Overfilling a manual transmission will cause fluid to leave from the vent but will create windage problems.
An area that creates more transmission issues is the shifter. It is common to install a "short throw shifter" into a manual trans equipped vehicle. The shifter is designed to shorten the amount of movement in the stock shifter making the shifts happen quicker. There are many excellent short throw shifters on the market and they do improve the shift sequence. However the driver needs to understand that the time it takes to shift is predicated on how fast the synchronizer can complete the shift without gear clash.
The art of synchronization is poorly understood by most drivers. The synchronizer is like a zipper. Everyone knows how to use it, but few understand how it really works.
If you do not have that disconnect of the powerflow, you are now trying to stop or slow 400 plus foot lbs of torque in the motor with a small friction surface that may be 3 or 4 inches in diameter and ¼ to ½ inch wide. This immediately damages the friction material of the ring, and can shear of the synchronizer keys like a guillotine. Once that happens you will have blocked out or grinding shifts as the sliding sleeve clashes with the engagement teeth on the speed gear. Up shifts require a lot less synchronizer effort than down shifts. Drivers who wish to slow the gear box down by using the transmission find out that brakes are a lot cheaper than transmissions.
As you can see, most transmission failures begin outside the transmission with a poor clutch release or a sloppy driver. In vehicles equipped with automatic transmissions, the driver has very little control over the shifts, but the manual trans has to relay on the driver to shift properly and full release the clutch every time.
the lines below are just snippets I lifted from the article to serve as Cliff Notes
http://www.rsgear.com/blog/2011/5/23/understanding-and-analyzing-manual-transmission-failures.aspx
Understanding and Analyzing Manual Transmission Failures
Posted on: Monday, May 23, 2011
... The most abused components in a vehicle are the clutch and the manual transmission as these components are completely at the mercy of the driver.
The road to ruin begins with the clutch.
Whenever you see the steel keys broken or sheared off, there can only be several causes. The first is improper or no clutch release, driver error where the clutch is not released or trying to shift without using the clutch or a driver that is moving the shift lever before the clutch has released, rushing the shift.
Another point of early transmission failure is the wrong choice of clutch for the application. This usually begins with the idea that installing a performance clutch will improve the vehicle performance.
Another cause of transmission failure is lubrication. Everyone knows that lack of lube fill due to leaks or lack of maintenance is the kiss of death for any component, but the type and quality of lube is very misunderstood.
Always be sure to use an oil that is specified for the model of trans in the vehicle.
The amount of lubrication is also critical for shift timing. Overfilling a manual transmission will cause fluid to leave from the vent but will create windage problems.
An area that creates more transmission issues is the shifter. It is common to install a "short throw shifter" into a manual trans equipped vehicle. The shifter is designed to shorten the amount of movement in the stock shifter making the shifts happen quicker. There are many excellent short throw shifters on the market and they do improve the shift sequence. However the driver needs to understand that the time it takes to shift is predicated on how fast the synchronizer can complete the shift without gear clash.
The art of synchronization is poorly understood by most drivers. The synchronizer is like a zipper. Everyone knows how to use it, but few understand how it really works.
If you do not have that disconnect of the powerflow, you are now trying to stop or slow 400 plus foot lbs of torque in the motor with a small friction surface that may be 3 or 4 inches in diameter and ¼ to ½ inch wide. This immediately damages the friction material of the ring, and can shear of the synchronizer keys like a guillotine. Once that happens you will have blocked out or grinding shifts as the sliding sleeve clashes with the engagement teeth on the speed gear. Up shifts require a lot less synchronizer effort than down shifts. Drivers who wish to slow the gear box down by using the transmission find out that brakes are a lot cheaper than transmissions.
As you can see, most transmission failures begin outside the transmission with a poor clutch release or a sloppy driver. In vehicles equipped with automatic transmissions, the driver has very little control over the shifts, but the manual trans has to relay on the driver to shift properly and full release the clutch every time.
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