aardvark Posted July 6, 2016 Report Share Posted July 6, 2016 Hello chaps. Any reason why I shouldn't replace my slightly warped, slightly leaky rocker cover with an alloy rocker cover? Is the one from Moss any good? Cheers Dave Quote Link to post Share on other sites
Tom Boyd Posted July 6, 2016 Report Share Posted July 6, 2016 Go for it!!! Moss one fits fine Tom Quote Link to post Share on other sites
TR NIALL Posted July 6, 2016 Report Share Posted July 6, 2016 There's also a wide Cork Gasket available that fits better than the Standard one when using on the Alloy Cover. Quote Link to post Share on other sites
Steves_TR6 Posted July 6, 2016 Report Share Posted July 6, 2016 The Racetorations one has an o ring seal which allows easy on-off action and no leaks. Quote Link to post Share on other sites
JohnG Posted July 6, 2016 Report Share Posted July 6, 2016 I have a 'Triumphtune' aluminium cover It's easy to seat and leaks not Quote Link to post Share on other sites
stephen cooper Posted July 6, 2016 Report Share Posted July 6, 2016 I've got one but I wouldn't have gone out of my way to buy one. Think they weigh more than standard. Quote Link to post Share on other sites
Dave McDonald Posted July 7, 2016 Report Share Posted July 7, 2016 There's also a wide Cork Gasket available that fits better than the Standard one when using on the Alloy Cover. Niall, Who is the supplier for these wider gaskets? I have an SAH alloy rocker cover with "squarer" corners than the pressed steel originals and have had problems with leakage at the corners on occasions due to difficulties in not being able to "stretch" it into position and keep it there until it is clamped down. The SAH unit has a flat bottom, unlike the pressed steel ones which benefit from the inbuilt groove around the perimeter to retain/position the gasket. The wider gasket that you mention could help overcome my problems. Dave McD Quote Link to post Share on other sites
astontr6 Posted July 7, 2016 Report Share Posted July 7, 2016 Hi SDerbyshire! I have an Racetorations one and had a bad experience with it leaking around the cap/neck. It went back to Racetorations twice and they fitted a new caps/necks but it still leaked. When I took out the neck my self I was surprised that this area was not machined but left rough sand cast. The surface was just like the moon! No wonder it leaked! Then I fitted a Speed Flow cap/neck assembly, no leaks. So does yours leak in this area as well? Bruce. Quote Link to post Share on other sites
TR NIALL Posted July 7, 2016 Report Share Posted July 7, 2016 Niall, Who is the supplier for these wider gaskets? I have an SAH alloy rocker cover with "squarer" corners than the pressed steel originals and have had problems with leakage at the corners on occasions due to difficulties in not being able to "stretch" it into position and keep it there until it is clamped down. The SAH unit has a flat bottom, unlike the pressed steel ones which benefit from the inbuilt groove around the perimeter to retain/position the gasket. The wider gasket that you mention could help overcome my problems. Dave McD I got them from Rimmers about 3yr ago. Quote Link to post Share on other sites
Dave McDonald Posted July 7, 2016 Report Share Posted July 7, 2016 I got them from Rimmers about 3yr ago. Thanks Niall. Dave Quote Link to post Share on other sites
ptjs1 Posted July 7, 2016 Report Share Posted July 7, 2016 Do all the various makes of alloy cover have a flat base with no location flange for the gasket? I want to fit one when I rebuild my engine but have concerns as to how well they can be sealed to the head? Is there a silicon gasket that can be used and won't kink in when tightened down? Paul Quote Link to post Share on other sites
TR NIALL Posted July 7, 2016 Report Share Posted July 7, 2016 (edited) Do all the various makes of alloy cover have a flat base with no location flange for the gasket? I want to fit one when I rebuild my engine but have concerns as to how well they can be sealed to the head? Is there a silicon gasket that can be used and won't kink in when tightened down? Paul Most are a Flat Base that's why the Wider Cork Gasket works well.Some Specalists have a Groove machined into the Base of the Rocker Cover to accept a Neoprene Gasket but these are an Expensive bit of Kit. Edited July 7, 2016 by TR NIALL Quote Link to post Share on other sites
Bill Bourne Posted July 7, 2016 Report Share Posted July 7, 2016 Most are a Flat Base that's why the Wider Cork Gasket works well. Some Specalists have a Groove machined into the Base of the Rocker Cover to accept a Silicone Gasket but these are an Expensive bit of Kit. I bought a standard ally cover which cost £49. Then had it machined at a local machine shop for £50 - I then fitted the synthetic gasket, about £20. It's untested as the engine hasn't been run yet, as car is still being re-built, but the result looks to be a very good solution. It provides just enough of an inner shoulder for the gasket to sit comfortably and not move. best Bill Quote Link to post Share on other sites
TR NIALL Posted July 7, 2016 Report Share Posted July 7, 2016 (edited) Racetorations do a Alloy R/Cover with the Groove machined into it and also supply the Neoprene Gasket. Edited July 7, 2016 by TR NIALL Quote Link to post Share on other sites
Steves_TR6 Posted July 7, 2016 Report Share Posted July 7, 2016 Hi SDerbyshire! I have an Racetorations one and had a bad experience with it leaking around the cap/neck. It went back to Racetorations twice and they fitted a new caps/necks but it still leaked. When I took out the neck my self I was surprised that this area was not machined but left rough sand cast. The surface was just like the moon! No wonder it leaked! Then I fitted a Speed Flow cap/neck assembly, no leaks. So does yours leak in this area as well? Bruce. Hi Bruce Mine only leaks every couple of years when the cork gasket in the cap gets squished, I make a new gasket and all is good. When I bought the car it had a 'bodged in' cork gasket instead of the o ring, Darryl at Racetorations made me a new o ring and it's not leaked since. The o ring was named after sound you make when he tells you the price ! But it works. Steve Quote Link to post Share on other sites
ShaunC Posted July 7, 2016 Report Share Posted July 7, 2016 I have an alloy cover (unknown origin) with a silicon gasket. Doesn't leak. Quote Link to post Share on other sites
astontr6 Posted July 7, 2016 Report Share Posted July 7, 2016 Hi Bruce Mine only leaks every couple of years when the cork gasket in the cap gets squished, I make a new gasket and all is good. When I bought the car it had a 'bodged in' cork gasket instead of the o ring, Darryl at Racetorations made me a new o ring and it's not leaked since. The o ring was named after sound you make when he tells you the price ! But it works. Steve Steve, Thanks for your response, The cap that Darryl uses is for a motor cycle petrol tank? My 1972 BSA has the same cap made by the same company? After fitting the Speed Flow Product, I am not convinced that the original cap is suitable in this application. Mine was leaking from the chain anchor on the neck, a rivet loose and between the bottom of the neck joint to alum R/Cover. It now seems that they have done away with the sand casting of the main body and gone to CNC Machined from solid billet. My suspicions are that they had a lot of complaints. As Niall points out, its a very pricey item! Bruce. Quote Link to post Share on other sites
Guest ntc Posted July 7, 2016 Report Share Posted July 7, 2016 Nope and nope it is also neoprene Quote Link to post Share on other sites
TR NIALL Posted July 7, 2016 Report Share Posted July 7, 2016 Neil is correct the Gasket is Neoprene,I just couldn't spell it so Silicone had to do. Quote Link to post Share on other sites
Guest ntc Posted July 7, 2016 Report Share Posted July 7, 2016 nowt wrong with std you just have to fit the casket right,Niail at IWE I will so you a modified cap for alloy. Quote Link to post Share on other sites
roy53 Posted July 8, 2016 Report Share Posted July 8, 2016 Dave you could have it machined to take the neoprene ring. but as yours is a real SAH cover i guess you are reluctant. roy Quote Link to post Share on other sites
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