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Old 09-20-2007, 05:59 AM
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350 TCI Transbrake

Hi I have a problem with a transbrake .When you start the car and try to engage the solenoid it will not engage.If you shut the motor off and then engage the solenoid it engages.We checked the release spring and even shortened it to see if it would make a difference but no change if you drive the car from 1st to 2nd to 3rd all is working but as soon as you try to switch the solenoid on with the motor running it will no switch on if you apply a small amount of pressure to the solenoid it then apply s as soon as it is released you can not get it to reengage
please can you help
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Old 09-20-2007, 06:14 PM
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Quote:
Originally Posted by Stanley H
Hi I have a problem with a transbrake .When you start the car and try to engage the solenoid it will not engage.If you shut the motor off and then engage the solenoid it engages.We checked the release spring and even shortened it to see if it would make a difference but no change if you drive the car from 1st to 2nd to 3rd all is working but as soon as you try to switch the solenoid on with the motor running it will no switch on if you apply a small amount of pressure to the solenoid it then apply s as soon as it is released you can not get it to reengage
please can you help
Thanks

what does TCI say?

Sounds like a weak solenoid possibly.

Does TCI require a hole drilled in the direct drum for pressure release?? Perhaps a hydraulic lock is happening?


the brake should only be applied in first gear.

Some trans - brakes require the solenoid to be engaged for reverse.

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Old 09-21-2007, 12:53 AM
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350 TCI Transbrake

We have changed the solenoid, drilled the hole in the drum followed all tci instructions in their manual. They only show 2 types of casings in their instructions but there is a third type of casing that we are using the only thing I can think is that it could be the casing as this is the fourth transbarake that we have built and is the only one with a different casing
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Old 09-28-2007, 12:48 AM
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350 TCI Transbrake

Hi I found the problem with the transbrake TCI only mention two types of casings there are actually three types. Changed the casing and the problem was solved .Took some pics of all the casings where the changes take place in the case if anyone is intrested or has had the same problem
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Old 09-28-2007, 08:34 AM
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tci

I would like to see the pictures if you would be kind enough to post them.
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Old 09-28-2007, 05:17 PM
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Me too.

IIRC there is some difference in the case casting around the 1-2 accumulator area. Some have a wall and others don't.
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Old 09-28-2007, 11:00 PM
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Eh, can anyone say modulator valve bore changes???
This is tah area where the solenoid works from a hydraulic point of view. The valve becomes hydraulically loaded beyond the capacity of the solenoid clamping force and solenoid cannot displace the oil on the valve. Comes down to the valve vent circuit....
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Old 10-01-2007, 08:12 AM
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350

Yes I can. I would still like to see the pictures! How about it Stanley.
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Old 10-01-2007, 11:15 AM
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350 TCI Transbrake

I have tried to post the pics of the 3 different casings hope they are there and will help someone.
Thanks again for all the help.
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Old 10-01-2007, 02:15 PM
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350tci

Stanley, yes your pictures did come thru and thank you for sending them.

I believe the case that you were trying to use was a 350c case, also known as a 350 lockup.

Comparing a 350c separator plate to a 350 non lockup plate you would notice no difference, from midway of the plates on down.[ speaking of feed holes ]. This includes the area where the modulator is, in your case this is where the solenoid is.

Also there is no difference in modulator bore size between the two cases [ lockup- non lockup ], as the diameter of the modulator valves are the same, comparing the two units.

So it seems logical to assume that how the transbrake valve is indexed would have been the same between the two cases.

Also logical to assume that the modulator bore size, since there is no difference, is not why you were having a problem.

However, starting at about the midway point of the plate [ actually slightly higher ] and moving upwards and to the right [ big hole in the plate to the left ] there is a huge difference between the plates.

This is why I think you ran into a problem.

Did your case, that gave you a problem, have a hole near the linkage about 4 inchs away, that would accept an electrical connector?

If so, this is a lockup case.

Again Stanley, thank you for the pictures and I'm glad you got it all worked out!
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Old 10-02-2007, 03:14 AM
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350 TCI Transbrake

Hi
No it is not a 350c casing. I have built many 350s over the past 15 years and have only come across one other casing that is the same as the one that gave me this problem. The standard spacer plate normally has a N stamped on it this plate has a K stamped on it
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Old 10-02-2007, 09:33 AM
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350 tci

Well dog gone it Stanley, You sure blew my theory all to #*&&.

Well look at the bright side, at least you know which case to stay away from! Take care Stanley.
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