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IaTR6
Dennis Costello
Central Iowa
(114 posts)

Registered:
12/29/2007 02:53PM

Main British Car:
'73 TR 6

Tremec T5 oil leak
Posted by: IaTR6
Date: May 23, 2017 12:42PM

I have an oil leak that only appears after driving. The drips collect at the main case/tailhousing seam, but I'm not so sure this is the source.
Since the conversion is an assembly of items in "layers", the view of the transmission is poor at best. I removed and resealed the reverse light switch, but
have a curiosity about the "cap" that apparently covers the end of a main case spring post for the reverse brake. I cannot find an on-line
service manual that addresses this part, and wonder if any of the readers here can shed any light on the subject?
The reason I suspect the oil leak is not at the main case/tailhousing seam is there is no additional leaking when parked. However,
maybe that is due to the cooling of the transmission and oil? I would just tear into it, but for this installation, I have to take out the diff,
driveshaft, entire exhaust, interior, etc., and I don't want to!!
Thanks,
Dennis


IaTR6
Dennis Costello
Central Iowa
(114 posts)

Registered:
12/29/2007 02:53PM

Main British Car:
'73 TR 6

Re: Tremec T5 oil leak
Posted by: IaTR6
Date: October 15, 2017 08:16PM

So, after much searching, I believe my previously mentioned oil leak is coming from the "don't remove" reverse/5th pivot pin bolt.
Since this is a rebuilt trans, I must suspect the bolt was removed at one time, and not resealed. Does anyone have experience with the T5, and a recommendation for sealant? I do understand I'll have to open the trans to reseal the bolt.
Thanks,
Dennis


BlownMGB-V8
Jim Blackwood
9406 Gunpowder Rd., Florence, KY 41042
(5343 posts)

Registered:
10/23/2007 12:59PM

Main British Car:
1971 MGB Blown,Injected,Intercooled Buick 340/AA80E/JagIRS

authors avatar
Re: Tremec T5 oil leak
Posted by: BlownMGB-V8
Date: October 15, 2017 11:30PM

Use the red anaerobic sealant, it doubles as locktite.
Jim


DiDueColpi
Fred Key
West coast - Canada
(1218 posts)

Registered:
05/14/2010 03:06AM

Main British Car:
What if the Hokey Pokey really is what it's all about?

authors avatar
Re: Tremec T5 oil leak
Posted by: DiDueColpi
Date: October 16, 2017 02:07PM

You might not have to open up the trans Dennis.
Back out the pivot bolt a few turns. By hand if you can, so that you can feel when it binds. Then stop before you dislodge the clip.
Now you can take a small artists paint brush and paint on the anaerobic sealant that Jim mentioned.
Tighten it back up and you're good to go.

Cheers
Fred



Edited 1 time(s). Last edit at 10/18/2017 02:23AM by DiDueColpi.


IaTR6
Dennis Costello
Central Iowa
(114 posts)

Registered:
12/29/2007 02:53PM

Main British Car:
'73 TR 6

Re: Tremec T5 oil leak
Posted by: IaTR6
Date: October 17, 2017 01:38PM

Jim and Fred,
Thanks for the information, I am very appreciative. I am still working on a solution to my droning exhaust, and expect to have my latest
effort installed and tested soon. Then, if it works, I will go on to the transmission. I would be very happy if the sealing of the pivot bolt without
dissembling the trans works, and I will be sure to let you know the results.
If the trans must come out, I have considered changing to a 2.95 1st gear. I have a 3.54 diff ratio, and the 3.35 1st just seems a little low.
If the trans doesn't come out-then I'll live with the low gear.
Thanks,
Dennis


MGBV8
Carl Floyd
Kingsport, TN
(3232 posts)

Registered:
10/23/2007 11:32PM

Main British Car:
79 MGB, Buick 215

authors avatar
Re: Tremec T5 oil leak
Posted by: MGBV8
Date: October 17, 2017 03:50PM

I would be looking for another T-5, if you want the 2.95 1st gear. Can't just change 1st gear. Input shaft & cluster gear at minimum. And, you are not going to like what that will do to 5th gear. ;)


BlownMGB-V8
Jim Blackwood
9406 Gunpowder Rd., Florence, KY 41042
(5343 posts)

Registered:
10/23/2007 12:59PM

Main British Car:
1971 MGB Blown,Injected,Intercooled Buick 340/AA80E/JagIRS

authors avatar
Re: Tremec T5 oil leak
Posted by: BlownMGB-V8
Date: October 17, 2017 10:19PM

Turns out mine has a 3.27:1 1st gear apparently.
1st-3.27, 2nd-1.98, 3rd-1.34, 4th-1.00, 5th-0.68
TCET2057 = TKO @ 425lb/ft

I think it'll be OK.

Dennis, what are you doing about your exhaust?

Jim



IaTR6
Dennis Costello
Central Iowa
(114 posts)

Registered:
12/29/2007 02:53PM

Main British Car:
'73 TR 6

Re: Tremec T5 oil leak
Posted by: IaTR6
Date: October 30, 2017 03:04PM

Jim,
I built two "Helmholtz" resonators to go after the muffler. I have no X or H pipe, so needed a resonator in each exhaust pipe, and after the muffler as it is a Magnaflow "X" type. Not aesthetically pleasing, but perhaps black paint will make them less obtrusive. I need to resize the pictures, and then I'll update my project journal.
Carl is right about the changes to get the 2.95 gear. Input, cluster, and the lower 3 gears. Maybe $1000 plus bearings, and i don't have the press, so shop expense on top. It seems like the 5th ratio would then be .5 something, which is a little tall.
I'd still rather do this than collect stamps!
Dennis


IaTR6
Dennis Costello
Central Iowa
(114 posts)

Registered:
12/29/2007 02:53PM

Main British Car:
'73 TR 6

Re: Tremec T5 oil leak
Posted by: IaTR6
Date: October 30, 2017 03:42PM

I updated "Dennis' TR6" project journal for those interested in my resonator project.
Dennis


MGBV8
Carl Floyd
Kingsport, TN
(3232 posts)

Registered:
10/23/2007 11:32PM

Main British Car:
79 MGB, Buick 215

authors avatar
Re: Tremec T5 oil leak
Posted by: MGBV8
Date: October 30, 2017 04:26PM



BlownMGB-V8
Jim Blackwood
9406 Gunpowder Rd., Florence, KY 41042
(5343 posts)

Registered:
10/23/2007 12:59PM

Main British Car:
1971 MGB Blown,Injected,Intercooled Buick 340/AA80E/JagIRS

authors avatar
Re: Tremec T5 oil leak
Posted by: BlownMGB-V8
Date: October 31, 2017 11:53AM

That's a lot like the ones Larry Shimp put on his car. I for one would like to see how you arrived at that volume.

Jim


IaTR6
Dennis Costello
Central Iowa
(114 posts)

Registered:
12/29/2007 02:53PM

Main British Car:
'73 TR 6

Re: Tremec T5 oil leak
Posted by: IaTR6
Date: October 31, 2017 12:52PM

Jim,
Here is how I developed my solution:
To determine the frequency, I used this formula: F=rpm of the droneX firing pulses per revolution / 60
Since the issue was at 2300 rpm, 2300X4/60=153.3 Hz Since this is an 8 cylinder, there are 4 firing impulses per revolution, and 8 in two revolutions.
A six would have three per revolution, and a four would have two. Both of those numbers would change the frequency, and resulting required volume.
At this point, a typical J-pipe length would be: speed of sound at the temp of the exhaust/freq, which would be 379.7/153.3=2.48 m.
And, if the J-pipe were for a 1/4 wave cancellation, I would have needed a .62m pipe, which is close to 24", and I just don't have the room for that.

So, going to an on-line calculator: [hyperphysics.phy-astr.gsu.edu]
I entered the temperature I found at my exhaust outlet (I did some guessing here, since idle would be cooler, and under load hotter).
I used a cheap infrared thermometer, and got a close enough value.
I chose 79C, which is 175 degrees F. In the calculation, this gives a speed of sound of 379.7m/sec.
I made a spreadsheet, and tried small tube sizes into a larger tube for 1 1/2 to 2 1/2' tube. Interestingly, a small tube into a larger seems
to result in the smallest required volume, so I chose a 1 1/2" tube into a 3" tube. selecting an 8" long 1 1/2" tube resulted in a required volume of
53.5 cu in. At 7.07 cu in per inch of length, I needed 7.6" of 3" tube for the resonant cavity. The fact that I have a 90 degree bend is not an issue, and in fact, I found an example of a round tube to a square volume and the two pieces were connected at 90 degrees. I was concerned
about the smaller tube bend, and did not choose a muffler shop bend, as that generally is a "crush" bend that would alter the tube inner
dimension and affect the frequency. I had to go online to buy the two mandrel bends, as the local shop wanted a 3-6 week lead time, and I'm too impatient for that.
Geez Louise, No wonder I got a blank look from the muffler shop when I asked about a Helmholtz resonator!
Dennis


BlownMGB-V8
Jim Blackwood
9406 Gunpowder Rd., Florence, KY 41042
(5343 posts)

Registered:
10/23/2007 12:59PM

Main British Car:
1971 MGB Blown,Injected,Intercooled Buick 340/AA80E/JagIRS

authors avatar
Re: Tremec T5 oil leak
Posted by: BlownMGB-V8
Date: November 01, 2017 06:15AM

Yeah, those guys are generally not physicists.
Interestingly enough since this is not new science, I suspect that a fair number of the old muffler designs had resonators built in. All it took was an inlet pipe extended into a divider wall with a hole larger than the pipe. I can remember seeing those designs.

In fact, why not? I will be going to a rear exit system before long and there's nothing that says the chamber can't be concentric with the exhaust pipe.

Jim


IaTR6
Dennis Costello
Central Iowa
(114 posts)

Registered:
12/29/2007 02:53PM

Main British Car:
'73 TR 6

Re: Tremec T5 oil leak
Posted by: IaTR6
Date: November 01, 2017 11:41AM

Absolutely, in fact, I see several examples when I do a search for a resonator muffler. Too bad I went down the path I did.
Ah well, next time!
Darn chilly and overcast weather. I'm not ready to put the car away for the winter-Grrr.
Dennis


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