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Joined: Jan 2002
Posts: 154
Shade Tree Mechanic
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OP
Shade Tree Mechanic
Joined: Jan 2002
Posts: 154 |
When I hit a bump in the road a grinding noise comes from the trans area. I thought it would be the front pinions.But with the car on jacks, torque tube all the way down(simulating a bounce) , the noise seems to be only in 3rd gear. With the cover removed I don't see anything unusual. Is there a better source than pg 64 of the repair manual to try to figure how this works and what the problem could possibly be?
FDNY
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Joined: Sep 2005
Posts: 189
Shade Tree Mechanic
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Shade Tree Mechanic
Joined: Sep 2005
Posts: 189 |
Just wondering if you get the noise in first or second? My '30 Coupe has noise in the first and second ranges but silent in high range.Could your noise be coming from the u-joint?
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Joined: Jan 2002
Posts: 154
Shade Tree Mechanic
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OP
Shade Tree Mechanic
Joined: Jan 2002
Posts: 154 |
I don't notice the noise in 1st or 2nd ,only in 3rd. Could be that everything revolves faster in 3rd. My first thought was that the new front pinions need to seat, but with the floor board removed the rumbling seems to come from the front of the trans. I did notice the trans was low on oil. Now I wonder if a front bushing is worn which would account for the noise and loss of oil.
I would still like a more explicit diagram of the trans than is on pg 64 of the '32 repair manual.
FDNY
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Joined: Nov 2003
Posts: 2,576 Likes: 2
ChatMaster - 2,000
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ChatMaster - 2,000
Joined: Nov 2003
Posts: 2,576 Likes: 2 |
IN THIRD GEAR, THE INPUT SHAFT AND THE MAINSHAFT ARE ROTATING AT THE SAME SPEED SO THE BUSHING IN THE INPUT SHAFT SHOULDN'T BE CAUSING ANY NOISE.MIKE
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Joined: Jan 2002
Posts: 154
Shade Tree Mechanic
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OP
Shade Tree Mechanic
Joined: Jan 2002
Posts: 154 |
Thanks Mike.
I realize the input shaft is directly connected to the output shaft in high gear, but that seems to be when it gets bad. . At idle the input shaft is spinning at the same speed no matter which gear, but when connected to high gear it sounds like its going to fly apart. Something not good is happening.
FDNY
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Joined: Sep 2005
Posts: 189
Shade Tree Mechanic
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Shade Tree Mechanic
Joined: Sep 2005
Posts: 189 |
Did you pull it out? If so, what did you find. I put bearings in my '30 about 15 years ago but I can't remember anything that might cause your problem. Since this unit is so basic you would think we could figure this out easy.I'm a old transmission mechanic(25 years) and I fell bad that I can't pinpoint your problem without seeing it. When you figure it out please let me know. Thanks,Stan
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Joined: Mar 2005
Posts: 861
ChatMaster - 750
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ChatMaster - 750
Joined: Mar 2005
Posts: 861 |
I had a similiar problem with my 26. No one could locate the problem. It turned out to be the ring gear in the rear, believe it or not.
Bill
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Joined: Dec 2005
Posts: 1,136
ChatMaster - 1,000
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ChatMaster - 1,000
Joined: Dec 2005
Posts: 1,136 |
Don't know if this will help you but it might...
Years ago I took an old doctor's stethoscope and cut off the part that goes against a patent’s skin and replaced it with a solid metal rod about 24” long.
When I touch the end of the rod against different places on a working drive line or running motor I get a really good idea about where odd sounds are coming from.
This is a take off on using a piece of a broom handle like a stethoscope that I have seen others use in the past and IMHO this works a whole lot better.
Good luck on finding and solving the problem.
People are like a box of chocolates you never know what you are going to get...
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