Z320 Posted August 20, 2021 Report Share Posted August 20, 2021 Hi, adjusting the tappets yesterday I realizes the TR shrunk the valve cover seal! It is about 10 mm too short now after about 10 years, at the front end with a opened gap to the head but not suspicious leak. For a quick solution I ordered a new standard cork compound seal (4 € + 10 € shipping). Any other suggestions? Ciao, Marco Quote Link to post Share on other sites
BlueTR3A-5EKT Posted August 20, 2021 Report Share Posted August 20, 2021 Yep, that is not uncommon. Fit new gasket and glue it to the cover. That’s often the cause of the oil dribble down the back of the engine causing owners to think the rear crank seal of the engine or the gearbox front seal have failed. Some better quality alloy rocker covers are now supplied with an ‘O’ ring groove milled in the mating face where the gasket would have been. Peter W Quote Link to post Share on other sites
Z320 Posted August 21, 2021 Author Report Share Posted August 21, 2021 (edited) Hi Peter, indeed I always thought my rear crank end is leak, but when I had the gearbox and flywheel out last winter I found it absolutely dry. A photo from the rear end, the seal is glued on the head. A photo from the front, the seal is slack, I can see the old area marked by the cover and a new mark at the very end of the seal - and the gap. I'm excited to see the difference with the new seal. Ciao, Marco Edited August 21, 2021 by Z320 Quote Link to post Share on other sites
Lebro Posted August 21, 2021 Report Share Posted August 21, 2021 I fix the cork seal to the head using wellseal (allowing it to dry first), after de-greasing. I apply grease to the top surface. It stays put, does not leak, & is good for many "cover off" operations. Bob. Quote Link to post Share on other sites
iain Posted August 21, 2021 Report Share Posted August 21, 2021 1 hour ago, Lebro said: I fix the cork seal to the head using wellseal (allowing it to dry first), after de-greasing. I apply grease to the top surface. It stays put, does not leak, & is good for many "cover off" operations. Bob. +1 Iain Quote Link to post Share on other sites
MichaelH Posted August 21, 2021 Report Share Posted August 21, 2021 Same idea but using the now available silicone rocker cover gasket: the thin one as I have an aluminium rocker cover. Glue the gasket to the cover with high temp RTV then when set use silicone plumbers grease to fit the rocker + gasket to the head The silicone grease allows easy removal and replacement and so far the gasket hasn't shrunk the way the cork ones do I will report back future if I find the silicone gasket has contracted. the real trick is the silicone grease for seal and release of the rocker cover Michael Quote Link to post Share on other sites
Z320 Posted August 21, 2021 Author Report Share Posted August 21, 2021 Thank you all for your advice, I'll wait for the seal and decide then what to do. Ciao, Marco Quote Link to post Share on other sites
Z320 Posted August 26, 2021 Author Report Share Posted August 26, 2021 Hi, I made a "model" to get the new seal fixed, glued the valve cover on it and greased the sealing surface of the head. This worded well, after a first test drive today for about 20 km everything around the head was dry. Thans all for your advice, this is a great forum! Marco Quote Link to post Share on other sites
pfenlon Posted August 29, 2021 Report Share Posted August 29, 2021 On 8/21/2021 at 8:13 AM, Lebro said: I fix the cork seal to the head using wellseal (allowing it to dry first), after de-greasing. I apply grease to the top surface. It stays put, does not leak, & is good for many "cover off" operations. Bob. Never thought of that , grand tip, thank you. Quote Link to post Share on other sites
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