Chris59 Posted December 30, 2014 Report Share Posted December 30, 2014 (edited) Hello guys, I have a problem with a seriously leaking Tr4' A type overdrive : the leak is from the solenoïd alloy bracket (item N°502566), where the actuating lever (502568) is connected to a shaft who goes through the overdrive. There is an o'ring in the alloy bracket, around the shaft, but it don't seems to be enough, as the beast is as dry as Gran' Ma underwear. So, please allow several questions : - how can I identify a repro bracket, as the culprit may be a badly moulded repro alloy cover/bracket ? - as someone made a cover/bracket with a hole for an oil seal instead of an o'ring ? - who killed Kennedy ? Thanks in advance for your help ! Edited December 30, 2014 by Chris59 Quote Link to post Share on other sites
Tom Fremont Posted December 30, 2014 Report Share Posted December 30, 2014 Hi Chris, These brackets are prone to bowing under the pressure of the accumulator spring. They don't see hydraulic pressure but do communicate with the sump so must have a good gasket seal. You can pound it into submission once removed from the 'box; OK if you go a little past flat since the bolts will pull it back nice and tight. Cheers, Tom Quote Link to post Share on other sites
Richard V Posted December 30, 2014 Report Share Posted December 30, 2014 Hi Chris, I think that the Red Baron does a conversion with a small lip seal. cheers, Richard. Quote Link to post Share on other sites
Dave Larnder Posted December 31, 2014 Report Share Posted December 31, 2014 Chris Have a word with Pete Cox, he has just serviced and adjusted my gearbox and overdrive . PM me if you want his e mail address and phone number Dave Quote Link to post Share on other sites
Chilliman Posted December 31, 2014 Report Share Posted December 31, 2014 Hello Chris, There's no real pressure at that part of the O/D to warrant anything more than the O ring, when I've rebuilt A types I just replace the seal and add a smear of oil when putting back together - I've never known one leak like you are describing, are you sure you haven't got a crack in the cover (which could happen sometimes when overloading accumlator spring) or the oil is tracking from elsewhere? Quote Link to post Share on other sites
AlanT Posted December 31, 2014 Report Share Posted December 31, 2014 You may find the seal has put a wear groove into the shaft. O-rings used to seal rotating shafts often do this. You can make a new shaft from precision ground silver-steel rod. Its 3/8in from memory. Quote Link to post Share on other sites
Chris59 Posted January 1, 2015 Author Report Share Posted January 1, 2015 Hello guys, I wish you all, and family, an happy new year ! Thanks for your replies and usefull tips. The leak is from the o'ring, after dismantling I've checked several points : - there is no wear groove into the shaft, - no crack on the cover, - the o'ring wasn't perfectly round (one part of the circumference was slimmer than the rest of the ring), so I guess the cover itself wasn't perfectly located on the overdrive body, hence the bad leak ? @ Richard, who's this Red Baron, is he flying a Fokker triplane too, and did you had my message about the Austin Seven books I've found for you ? Quote Link to post Share on other sites
AlanT Posted January 1, 2015 Report Share Posted January 1, 2015 (edited) Try this for O-rings. EPDM is a good grade of rubber for oil-resistance. http://www.chronos.ltd.uk/cgi-bin/sh000001.pl?WD=ring&PN=O_Rings.html#aESR_2e_2e_2e Edited January 1, 2015 by AlanT Quote Link to post Share on other sites
Trumpy3 Posted January 2, 2015 Report Share Posted January 2, 2015 happy New Year to all. Just a thought. Is the small spacer(collar) in place to hold the 'O' ring? Item 56(502567) in the Moss catalog. Quote Link to post Share on other sites
Chris59 Posted January 2, 2015 Author Report Share Posted January 2, 2015 @ AlanT, thanks for the link, it may be usefull. @Trumpy3 (?), no, I haven't got this collar, do you know if it is supposed to be inside the cover, or between the cover and the lever ? Quote Link to post Share on other sites
Richard V Posted January 4, 2015 Report Share Posted January 4, 2015 (edited) http://www.redbarongarage.com/center.htm The problem with the O ring set up, is that it is on the outside, so the oil has already left the box befort the poor little ring trys to stop it. The lip seal conversion works well on my car and on the OD that Vincent has in the TR2. I will try and find pictures. Didnt see your message? Edited January 4, 2015 by Richard V Quote Link to post Share on other sites
Chris59 Posted January 4, 2015 Author Report Share Posted January 4, 2015 Richard, it was a text I left on your mobile. I'll sent you a PM, I like the lip seal solution Quote Link to post Share on other sites
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