Subject: [TR] GT6 trans bearing noise on launch

From: aribert neumann <[email-masked]>
Date: Fri, 17 Feb 2023 23:05:36 -0500

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Greetings all:

My Spit bodied GT6 has made a bearing noise / screech (may be a bit severe
of a word) on launch.  This noise lasts about half way thru 1st gear but
beyond full clutch release.  I've pulled the trans and begun to
disassemble.   The throw out bearing feels good.  The input shaft bearing
feels good - I was expecting this bearing to be the problem child - bearing
only has 33k miles on it.  I've had similar bearing noise on launch on my
winter car (Isuzu Amigo) and the problem was the input shaft bearing.  What
else should I be looking for, focused on, as I continue to dismantle the
trans?

Of note:  the oil level in the trans dropped low enough (twice, hanging my
head in shame) that the OD was dropping out and reengaging.

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<div dir=3D"ltr">Greetings all:<div><br></div><div>My Spit bodied GT6 has m=
ade a bearing noise / screech (may be a bit severe of a word) on launch.=C2=
=A0 This noise lasts about half way thru 1st gear but beyond=C2=A0full clut=
ch release.=C2=A0 I&#39;ve pulled the trans and begun to disassemble.=C2=A0=
 =C2=A0The throw out bearing feels good.=C2=A0 The input shaft bearing feel=
s good - I was expecting this bearing to be the problem child - bearing onl=
y has 33k miles on it.=C2=A0 I&#39;ve had similar bearing noise on launch o=
n my winter car (Isuzu Amigo) and the problem was the input shaft bearing.=
=C2=A0 What else should I be looking for, focused on, as I continue to dism=
antle the trans?=C2=A0 =C2=A0</div><div><br></div><div>Of note:=C2=A0 the o=
il level in the trans dropped low enough (twice, hanging=C2=A0my head in sh=
ame) that the OD was dropping out and reengaging.</div></div>

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From: Paul Tegler <[email-masked]> mail.backend.jedi.jws.acl:role.jedi.acl.token.atz.jws.hermes.aol
Date: Sat, 18 Feb 2023 01:50:39 -0500

having rebuilt at least 15+ Spit/GT6 boxes, I can say I've never heard a 
'screech' as an issue with these boxes.
You only need to be about 1/2-2/3 a qt low for the O/D to drop out 
(assuming a D -type here?)
when you say 'launch' ...my minds eye reads 'hard dump from a stand still'.
I'm hoping you're simply 'short-handing' starting off from a standstill.

If it's only in first gear, a very high load is being placed on the bush 
in the ass end of the crank which is only oiled bronze.
If it's the tranny.... cold on the bench... you can chuck on a big 1/2" 
electric drill to spin up the tranny.  If anything... dry bearings 
created the 'screech' befor they became saturated in oil once the tranny 
started spinning. Even 'looow' oil... as long as the level was not below 
the layshaft bearings, (barely 1 qt left) all the bearings got oiled 
once spun up.  I'f you're tearing into it, replace all the bearings and 
synchros. Biggest effort will be finding goot synchros to mesh wit hthe 
various gears. You'll need more than the number need so you can mix and 
match and test enough that fit right.
good luck.

ptegler

On 2/17/2023 11:05 PM, aribert neumann wrote:
> Greetings all:
>
> My Spit bodied GT6 has made a bearing noise / screech (may be a bit 
> severe of a word) on launch.  This noise lasts about half way thru 1st 
> gear but beyond full clutch release.  I've pulled the trans and begun 
> to disassemble.   The throw out bearing feels good.  The input shaft 
> bearing feels good - I was expecting this bearing to be the problem 
> child - bearing only has 33k miles on it.  I've had similar bearing 
> noise on launch on my winter car (Isuzu Amigo) and the problem was the 
> input shaft bearing.  What else should I be looking for, focused on, 
> as I continue to dismantle the trans?
>
> Of note:  the oil level in the trans dropped low enough (twice, 
> hanging my head in shame) that the OD was dropping out and reengaging.
>
> Donate: http://www.team.net/donate.html
> Unsubscribe/Manage: http://autox.team.net/mailman/options/triumphs/[email-masked]

-- 
Paul Tegler
[email-masked]  www.teglerizer.com

Donate: http://www.team.net/donate.html
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From: aribert neumann <[email-masked]>
Date: Sun, 19 Feb 2023 11:19:25 -0500

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Thank you all for responding.

Dave:
I have yet to look at the pilot bushing.  Because I have a 2.5L engine
mated to the GT6 gearbox, I have a custom sized pilot bushing.

ptegler:
TRans is already partially disassembled - too late to try to drive it with
a large drill.  No drag starts, by launch I am just referring to taking off
in first gear, frequently in traffic.  Noise only in first gear and
typically not the entire time in first gear.  Are you referring to the
bronze thrust washer on the laygear end or the crankshaft thrust washer in
your message?  I have a nonOD trans that I opened up a couple of days ago.
I got the trans out of a self serve salvage yard - it did not appear the
engine/trans had ever been separated.  Came with the original Laycock
pressure plate.   Synchro gaps in the non OD trans ranged from 0.033 up to
0.044 whereas my OD box ranged from 0.021 to 0.035

All:
And now for a bit of a sad story.  I dropped the laygear and removed the
input shaft on my squealing OD trans on Friday.  Saturday, I went to do the
same with an imalulate (wear wise) non OD trans I had.  I did not follow
the dismantle procedure and forgot to drop the laygear before pulling the
input shaft out.  An input shaft with a 4th gear that showed absolutely no
wear - I was planning on using that fourth gear in my OD box.  I yanked on
the slide hammer hard enough that I broke two of the little teeth off of
4th gear and chipped the laygear.

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<div dir=3D"ltr">Thank you=C2=A0all=C2=A0for responding.=C2=A0=C2=A0<div><b=
r></div><div>Dave:</div><div>I have yet to look at the pilot bushing.=C2=A0=
 Because I have a 2.5L engine mated to the GT6 gearbox, I have a custom siz=
ed pilot bushing.=C2=A0</div><div>=C2=A0</div><div>ptegler:</div><div>TRans=
 is already partially disassembled - too late to try to drive it with a lar=
ge drill.=C2=A0 No drag starts, by launch I am just referring to taking off=
 in first gear, frequently in traffic.=C2=A0 Noise only in first gear and t=
ypically not the entire time in first gear.=C2=A0 Are you referring to the =
bronze thrust washer on the laygear end or the crankshaft=C2=A0thrust washe=
r in your message?=C2=A0 I have a nonOD trans that I opened up a couple of =
days ago.=C2=A0 I got the trans out of a self serve salvage yard - it did n=
ot appear the engine/trans had ever been separated.=C2=A0 Came with the ori=
ginal Laycock pressure plate.=C2=A0 =C2=A0Synchro gaps in the non OD trans =
ranged from 0.033 up to 0.044 whereas my OD box ranged from 0.021 to 0.035<=
/div><div><br></div><div>All:</div><div>And now for a bit of a sad story.=
=C2=A0 I dropped the laygear and removed the input shaft on my squealing OD=
 trans on Friday.=C2=A0 Saturday, I went to do the same with an imalulate (=
wear wise) non OD trans I had.=C2=A0 I did not follow the dismantle procedu=
re and forgot to drop the laygear before pulling the input shaft out.=C2=A0=
 An input shaft with a 4th gear that showed absolutely no wear - I was plan=
ning on using that fourth gear in my OD box.=C2=A0 I yanked on the slide ha=
mmer hard enough that I broke two of the little teeth off of 4th gear and c=
hipped the laygear.</div></div>

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