<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div>We have some experience with rear main seal issues on our TR4 race motor. When we purchased our car, all of the cranks that were included had already been machined and the scroll removed. We have been able seal the engines successfully with careful preparation using these cranks and we have been happy with the results. Here is what we learned:</div><div id="AppleMailSignature"><br></div><div id="AppleMailSignature">1. The Revington Seal Kit does work very well when it is installed properly. It is good product. </div><div id="AppleMailSignature"><br></div><div id="AppleMailSignature">2. There are a lot of cranks floating around that had the scroll removed, but they were not machined to the correct size for the seal kit. We have found some that have been machined too small and one that was too large. Too large was just as big a problem, because the seal could not close all the way around the crank causing a leak with the oil pressures that we run.</div><div id="AppleMailSignature"><br></div><div id="AppleMailSignature">3. The aluminum seal housings are often not installed and sealed correctly. The problem is further compounded by the felt seal not being completely sealed when the rear main bearing cap is installed. We use 1 inch pieces of the felt soaked in Permatex Aviation Sealer and pack them in tight. It is messy, but seams to work well.</div><div id="AppleMailSignature"><br></div><div id="AppleMailSignature">4. Measure your crank seal surface very carefully. If it is too small or too large, the seal will not work correctly. Both issues can be corrected. Have a good machine shop read the instructions and help you get the crank prepped per the instructions that come with the seal kit.</div><div id="AppleMailSignature"><br></div><div id="AppleMailSignature">5. Make sure that the machine shop leaves the correct radius corner when they machine the scroll off.</div><div id="AppleMailSignature"><br></div><div id="AppleMailSignature">6. Follow the instructions that Revington includes in his kit to the letter, and the seal will work great in racing applications.</div><div id="AppleMailSignature"><br></div><div id="AppleMailSignature">7. I will only use replacement seals for our housings that are purchased directly from Revington TR. I have been told that another vendor tried to have some produced and they may not be the correct size and specification for the Revington housing. Going to Revington TR for the replacements solves that issue.</div><div id="AppleMailSignature"><br></div><div id="AppleMailSignature">8. Choose the sealant that you use for the housing very carefully. We have had very good success with Hylomar. There may be other good choices but that has worked for us.</div><div id="AppleMailSignature"><br></div><div id="AppleMailSignature">Hope some of this helps and best of luck getting the motor sealed up.</div><div id="AppleMailSignature"><br></div><div id="AppleMailSignature">Paul Ricco</div><div id="AppleMailSignature">TR4 Blue #4</div><div id="AppleMailSignature"><br></div><div id="AppleMailSignature"><br><br>Sent from my iPad</div><div><br>On Jan 21, 2017, at 9:43 AM, Jack Wheeler via Fot <<a href="mailto:fot@autox.team.net">fot@autox.team.net</a>> wrote:<br><br></div><blockquote type="cite"><div><div style="color:#000; background-color:#fff; font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:16px"><div id="yiv8498929265"><div id="yui_3_16_0_ym19_1_1485012161725_7939"><div style="color:#000;background-color:#fff;font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:16px;" id="yui_3_16_0_ym19_1_1485012161725_7938"><div id="yiv8498929265yui_3_16_0_ym19_1_1485010055601_14821"><span id="yiv8498929265yui_3_16_0_ym19_1_1485010055601_15104">Before the Viton seal became available, I used a couple of different approaches to keeping the crankcase sealed at 7,000 RPM's, both involved machining off the scrolling from the rear of the crankshaft. The first was to use a rope seal, like the E-Type Jaguar. I took the dimension off the Jag crank, then machined the Triumph crank to the same OD. I used the stock Triumph aluminum seal to hold the rope seal in place.</span></div><div id="yui_3_16_0_ym19_1_1485012161725_7955"><span id="yiv8498929265yui_3_16_0_ym19_1_1485010055601_15104"><br clear="none"></span></div><div dir="ltr" id="yui_3_16_0_ym19_1_1485012161725_7957"><div id="yui_3_16_0_ym19_1_1485012161725_9442"><span id="yiv8498929265yui_3_16_0_ym19_1_1485010055601_15104">My next attempt was a big block Chevy, 2 part neoprene seal. Again, I machined the Triumph crank surface where the seal rides to the same OD as the Big Block Chevy Crank. Then I machined a two part aluminum retainer, similar to the stock Triumph rear seal, but with the inside machined to hold the Chevy seal in place. I think there was a kit available at one time, were you could buy the seal, and the adapter that holds it in place (Moss (?) or someone like that had made up the same aluminum adapter that I had, and were selling it as a kit). Anyway, this worked pretty well as long as you got the Chevy seal well centered around the crankshaft.</span></div><div id="yui_3_16_0_ym19_1_1485012161725_9440"><span id="yiv8498929265yui_3_16_0_ym19_1_1485010055601_15104"><br></span></div><div id="yui_3_16_0_ym19_1_1485012161725_8684"><span id="yiv8498929265yui_3_16_0_ym19_1_1485010055601_15104">You might go to a junk yard (or speed shop) and find out what the dimension of the big block Chevy crank is, at the point where the rear seal rides against the crank. If your cranks can be machined to this diameter, then see if you can find one of the old Moss conversion kits. When I sold my race car to Don Marshall (#11 EP TR-4A - Runoffs winner 1990), there were 2 or 3 of these seal adapters that went with it. If you can track it down, see if one of these seal adapters is available (out of an engine), and could be used as a sample to have one machined. Or, you could do like I did. Buy the big block Chevy seal, and use it as a template, along with a stock Triumph rear seal, to figure the dimensions needed to machine a two part adapter. This may seem like a lot of work, but if your cranks are good, it might be cheaper than getting a new crank, especially if you have good machining capability available.</span></div><div id="yui_3_16_0_ym19_1_1485012161725_9398"><span id="yiv8498929265yui_3_16_0_ym19_1_1485010055601_15104"><br></span></div><div id="yui_3_16_0_ym19_1_1485012161725_9573"><span id="yiv8498929265yui_3_16_0_ym19_1_1485010055601_15104">Good luck, and let me know what you decide.</span></div><div id="yui_3_16_0_ym19_1_1485012161725_9569"><span id="yiv8498929265yui_3_16_0_ym19_1_1485010055601_15104"><br></span></div><div id="yui_3_16_0_ym19_1_1485012161725_9571"><span id="yiv8498929265yui_3_16_0_ym19_1_1485010055601_15104">Jack<br></span></div></div><div class="yiv8498929265qtdSeparateBR" id="yiv8498929265yui_3_16_0_ym19_1_1485010055601_14958"><br clear="none"><br clear="none"></div><div class="yiv8498929265yqt9368052574" id="yiv8498929265yqt12691"></div></div></div></div><div class=".yiv8498929265yahoo_quoted" id="yui_3_16_0_ym19_1_1485012161725_8094"> <div id="yiv8498929265yui_3_16_0_ym19_1_1485010055601_14961" style="font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:16px;"> <div id="yiv8498929265yui_3_16_0_ym19_1_1485010055601_14960" style="font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:16px;"> <div dir="ltr" id="yiv8498929265yui_3_16_0_ym19_1_1485010055601_14959"> <font id="yiv8498929265yui_3_16_0_ym19_1_1485010055601_14963" size="2" face="Arial"> </font><hr size="1"> <b><span style="font-weight:bold;">From:</span></b> Tony Drews via Fot <<a href="mailto:fot@autox.team.net">fot@autox.team.net</a>><br clear="none"> <b><span style="font-weight:bold;">To:</span></b> Joe Boruch <<a href="mailto:jaboruch@netzero.net">jaboruch@netzero.net</a>>; <a href="mailto:fot@autox.team.net">fot@autox.team.net</a> <br clear="none"> <b><span style="font-weight:bold;">Sent:</span></b> Saturday, January 21, 2017 3:12 AM<br clear="none"> <b id="yui_3_16_0_ym19_1_1485012161725_9890"><span style="font-weight:bold;" id="yui_3_16_0_ym19_1_1485012161725_9889">Subject:</span></b> Re: [Fot] TR3/4 Rear Main Seal<br clear="none"> </div> <div class="yiv8498929265y_msg_container" id="yiv8498929265yui_3_16_0_ym19_1_1485010055601_14964"><br clear="none">I did get the message but don't have any alternate suggestions for <br clear="none">rear seal if the crank is machined for the earlier seal kits.<br clear="none"><br clear="none">- Tony Drews<br clear="none"><br clear="none">At 06:57 PM 1/20/2017, Joe Boruch via Fot wrote:<br clear="none">>Not sure if this went thru before, since I did not receive it in my <br clear="none">>inbox and did not receive any replies. Sorry for the duplication, <br clear="none">>if it went out previously.<br clear="none">><br clear="none">>The recent discussion of the valve cover gasket reminded me to ask <br clear="none">>about TR3/4 rear main seals. I know that the new improved Viton <br clear="none">>seals are make to fit cranks that the scroll surface has not been <br clear="none">>machined. All my cranks have been machined to fit the earlier seal <br clear="none">>kits. Is there an upgraded seal kit to fit machined cranks or would <br clear="none">>there even be any advantage to using the new seal? Joe(B)<br clear="none">><br clear="none">><br clear="none">><a rel="nofollow" shape="rect" ymailto="mailto:fot@autox.team.net" target="_blank" href="mailto:fot@autox.team.net">fot@autox.team.net</a><br clear="none">><br clear="none">><a rel="nofollow" shape="rect" target="_blank" href="http://www.fot-racing.com/">http://www.fot-racing.com</a><br clear="none">><br clear="none">>Donate: <a rel="nofollow" shape="rect" target="_blank" href="http://www.team.net/donate.html">http://www.team.net/donate.html</a><br clear="none">>Archive: <a rel="nofollow" shape="rect" target="_blank" href="http://www.team.net/archive">http://www.team.net/archive</a><br clear="none">>Forums: <a rel="nofollow" shape="rect" target="_blank" href="http://www.team.net/forums">http://www.team.net/forums</a><br clear="none">>Unsubscribe/Manage: <br clear="none">><a rel="nofollow" shape="rect" target="_blank" href="http://autox.team.net/mailman/options/fot/tony@tonydrews.com">http://autox.team.net/mailman/options/fot/tony@tonydrews.com</a><div class="yiv8498929265yqt0174639808" id="yiv8498929265yqtfd15926"><br clear="none"><br clear="none"><br clear="none">_______________________________________________<br clear="none"><a rel="nofollow" shape="rect" ymailto="mailto:fot@autox.team.net" target="_blank" href="mailto:fot@autox.team.net">fot@autox.team.net</a><br clear="none"><br clear="none"><a rel="nofollow" shape="rect" target="_blank" href="http://www.fot-racing.com/">http://www.fot-racing.com</a><br clear="none"><br clear="none">Donate: <a rel="nofollow" shape="rect" target="_blank" href="http://www.team.net/donate.html">http://www.team.net/donate.html</a><br clear="none">Archive: <a rel="nofollow" shape="rect" target="_blank" href="http://www.team.net/archive">http://www.team.net/archive</a><br clear="none">Forums: <a rel="nofollow" shape="rect" target="_blank" href="http://www.team.net/forums">http://www.team.net/forums</a><br clear="none">Unsubscribe/Manage: <a rel="nofollow" shape="rect" target="_blank" href="http://autox.team.net/mailman/options/fot/jwheeler1947@yahoo.com">http://autox.team.net/mailman/options/fot/jwheeler1947@yahoo.com</a><br clear="none"><br clear="none"><br clear="none"></div><br clear="none"><br clear="none"></div> </div> </div> </div></div></div></blockquote><blockquote type="cite"><div><span>_______________________________________________</span><br><span><a href="mailto:fot@autox.team.net">fot@autox.team.net</a></span><br><span></span><br><span><a href="http://www.fot-racing.com">http://www.fot-racing.com</a></span><br><span></span><br><span>Donate: <a href="http://www.team.net/donate.html">http://www.team.net/donate.html</a></span><br><span>Archive: <a href="http://www.team.net/archive">http://www.team.net/archive</a></span><br><span>Forums: <a href="http://www.team.net/forums">http://www.team.net/forums</a></span><br><span>Unsubscribe/Manage: <a href="http://autox.team.net/mailman/options/fot/paulricco@att.net">http://autox.team.net/mailman/options/fot/paulricco@att.net</a></span><br><span></span><br><span></span><br></div></blockquote></body></html>