Rebuilt transmission noisy 3rd

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fiatfactory
Posts: 506
Joined: Sun Jun 13, 2010 11:22 pm
Your car is a: 1970 128

Re: Rebuilt transmission noisy 3rd

Postby fiatfactory » Wed Dec 23, 2015 8:28 pm

.
Last edited by fiatfactory on Tue Jul 02, 2019 4:58 am, edited 1 time in total.
nothing to see here... move along.

grrrdot
Posts: 224
Joined: Mon Jan 02, 2012 11:14 pm
Your car is a: 1967 124

Re: Rebuilt transmission noisy 3rd

Postby grrrdot » Wed Dec 23, 2015 9:36 pm

For that last picture with the different style syncro yes. Thats the innards of the old 4psd I pulled out it whined in almost every gear I don't plan on re-using it.
Going out of town tomorrow so I wont get to pull the trans out until after I return. This means I will spend my vacation trying to research whats wrong.

I did find this picture which makes it look like the front layshaft bearing is up against the layshaft, so that might be normal.
Image

-G

grrrdot
Posts: 224
Joined: Mon Jan 02, 2012 11:14 pm
Your car is a: 1967 124

Re: Rebuilt transmission noisy 3rd

Postby grrrdot » Mon Dec 28, 2015 8:51 pm

Alright I pulled the trans and got a closer look.

The slider engagement to 3rd gear feels wrong. I can shift into 3rd but as I turn the input shaft there are two clunks and the slider sort of moves for the second clunk. 2nd/1st gear do not behave this way.
https://youtu.be/JCviTN0z1SM
https://youtu.be/Nwk9LMw7UsA

So is something wrong with the hub or slider?

-G

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Nanonevol
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Posts: 828
Joined: Thu Nov 13, 2014 9:17 am
Your car is a: 1977 Fiat 124 Spider
Location: Medway, Massachusetts

Re: Rebuilt transmission noisy 3rd

Postby Nanonevol » Sun Jun 12, 2016 7:33 pm

Curious if this got resolved.
1977 Fiat Spider
1985 Jaguar XJ6
1967 Triumph Bonneville (hard-tail chopper)
1966 BSA Lightning

grrrdot
Posts: 224
Joined: Mon Jan 02, 2012 11:14 pm
Your car is a: 1967 124

Re: Rebuilt transmission noisy 3rd

Postby grrrdot » Sun Nov 20, 2016 3:58 pm

Nanonevol wrote:Curious if this got resolved.


Nope!
From reading more about different transmission sounds I am going to guess that the layshaft should have been replaced along with the rest of the gears.
I ended up getting a used Lada trans that has the shifter in the correct location for my Sedan so this trans is on the shelf for now. I did notice that the Lada trans makes a similar truck-ish sound on decel when the engine is at low RPM...

-G

djape1977
Posts: 985
Joined: Sat Apr 21, 2012 6:08 pm
Your car is a: 1970 fiat 124bc
Location: Belgrade, Serbia, eastern Europe

Re: Rebuilt transmission noisy 3rd

Postby djape1977 » Sun Nov 20, 2016 8:02 pm

glad to see you're alive

check your email

gm404
Posts: 9
Joined: Tue Mar 03, 2015 8:05 am
Your car is a: 1986 Lada 2107

Re: Rebuilt transmission noisy 3rd

Postby gm404 » Mon Jan 08, 2018 3:25 am

grrrdot wrote:
Nanonevol wrote:Curious if this got resolved.


Nope!
From reading more about different transmission sounds I am going to guess that the layshaft should have been replaced along with the rest of the gears.
I ended up getting a used Lada trans that has the shifter in the correct location for my Sedan so this trans is on the shelf for now. I did notice that the Lada trans makes a similar truck-ish sound on decel when the engine is at low RPM...

-G


Was that noise not coming from the differential, or the loosened driveshaft flange screws on the diff?
The video with the ticking of the engaged gear makes me still think. I build such gearboxes and diffs for my living :)
Was the syncro ring set properly around the gear? It makes about 1,5 turns around it, one end is held by that thin toothed plate
https://nivamart.ru/imgs/21010-1701169- ... 00-0_1.jpg
and "hooked" sideways into a groove, other is pressing the brass ring AND sitting in an other groove. The closing clip has to sit properly in its thin seat. When you press the syncro ring onto the gear by hand, they touch completely and the syncro ring must disappear. I would think the ends of the big syncro ring are put one step (groove) too close to each other, making the ring sit loose and jam behind the edge of the syncro ring. If that is the case, that can be fixed without dismantling everything again.
http://bit.ly/2CQPOGr

redauto
Posts: 20
Joined: Sun Jul 05, 2009 12:19 pm
Your car is a: 1980 fiat spider auto
Location: Texas

Re: Rebuilt transmission noisy 3rd

Postby redauto » Sun Jan 14, 2018 5:13 pm

grrrdot wrote:If none of the Lada gears are compatible have I ruined the layshaft?
Looks like the 4 speed has a different style syncro so cant use those gears:
Image

-G

all the lada trans parts are compatible except 5th gear. the 3rd gear was new?
Jay
1985 fiat spider auto
driven fiats since 1972
www.spiderroadster.com


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