Which valve stem seals leak
#81
I tried ringing Ford, Suzuki & Toyota.
-Toyota had what they called exhaust valves - listed as inlet valves on the link and were more expensive than Mazda.
-Ford didn't even recognise the part number
-Suzuki weren't open.
I have found a seller on eBay selling genuine Kia intake valves - £8 for all 8... I have bit the bullet and bought the full engine gasket set from Mazda - there's another $350 gone.
Now to decide whether to use the stock HG or buy Cometic.
-Toyota had what they called exhaust valves - listed as inlet valves on the link and were more expensive than Mazda.
-Ford didn't even recognise the part number
-Suzuki weren't open.
I have found a seller on eBay selling genuine Kia intake valves - £8 for all 8... I have bit the bullet and bought the full engine gasket set from Mazda - there's another $350 gone.
Now to decide whether to use the stock HG or buy Cometic.
#82
If you look at the link I posted and take a minute you'll see all the cross-references/vehicles/dimensions/part numbers you need and can order whatever you want online. Valve stem seal cross-reference - post #37
Also, for whoever is so inclined, here's a paper (attached) on valve stem seals + design + materials + tips on installation etc.
I have another email into Supertech to get a definitive answer on diameter range their seals can handle. Will post when/if I get a reply.
EDIT: Well I got a reply but nothing of substance. I specifically asked what valve stem diameter the seals were designed to accommodate and the reply was "They're designed for 6mm stems".
Kind of funny especially when they list their exhaust stems @ 5.94 which is 0.025 [.001"] below the factory tolerance (5.965-5.980, 5.915 Min). Oh well.
Also, for whoever is so inclined, here's a paper (attached) on valve stem seals + design + materials + tips on installation etc.
I have another email into Supertech to get a definitive answer on diameter range their seals can handle. Will post when/if I get a reply.
EDIT: Well I got a reply but nothing of substance. I specifically asked what valve stem diameter the seals were designed to accommodate and the reply was "They're designed for 6mm stems".
Kind of funny especially when they list their exhaust stems @ 5.94 which is 0.025 [.001"] below the factory tolerance (5.965-5.980, 5.915 Min). Oh well.
Last edited by bahurd; 05-18-2017 at 05:29 PM.
#84
Supertechs installed this winter. A couple hundred miles on them, and I could see the oil pissing out the exhaust manifold.
I'm in the middle of replacing them with felpros. My impression is that it's way easier to feel the double click as the felpros seat.
Also, use this gimmick when you reinstall the keepers
1) seat the keepers so they're started on the valve stem.
2) slip a Ziploc bag over the top of the keepers and under whatever you use to compress the spring. Push it. Push it real good. The plastic guides the keepers into place. Super easy.
I'm in the middle of replacing them with felpros. My impression is that it's way easier to feel the double click as the felpros seat.
Also, use this gimmick when you reinstall the keepers
1) seat the keepers so they're started on the valve stem.
2) slip a Ziploc bag over the top of the keepers and under whatever you use to compress the spring. Push it. Push it real good. The plastic guides the keepers into place. Super easy.
#88
Its oil, don't worry about it.
"Are you sure?"
Yeah.
I've been having this same conversation since my STs went **** up back in 2015 I hope the felpros work out for you, we definitely need more datapoints on this one.
#98
Not surprised at super tecks responds. I'm sure they are well aware if their seals are dodgy or not.Who would admit to that. But as far as the specific details of the seals themselves go They might be concerned that you will start havin your own ones mad which may end up better than thiers.
I've just installed the Miata Roadster ones from Bill.
COMP Cams Valve Stem Oil Seals - MiataRoadster - High-performance service...and parts for Mazda Miata Roadsters
not sure what the verdict is for those. Its only been a few weeks.....before I spotted this thread.
I've just installed the Miata Roadster ones from Bill.
COMP Cams Valve Stem Oil Seals - MiataRoadster - High-performance service...and parts for Mazda Miata Roadsters
not sure what the verdict is for those. Its only been a few weeks.....before I spotted this thread.