#$%@# valve seals - Don Terrill's Speed-Talk

Post by Ken_Parkman » Sat Sep 03, 12:49 pm

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I'm trying to install metal jacketed viton seals (Comp pn 519) on a guide with a threaded seal area and getting absolutely nowhere. These are a 5/16 stem valve with the Manley matching solid guides with a .500" threaded top, and there is a little bead on the metal seal that catches on the thread, yanks and twists and wrecks the seal. The supplier said "just tap on the end with a socket", but a tap does not work - it's a serious whack with a hammer to get the bead to go over the thread. I've also made a tool that holds on the edge of the metal jacket to try and keep it straight - no go just crushes the jacket.

There is lots of clearance with the spring - these small jackets are not necessary. Is there a relatively conventional viton seal for a 5/16" valve 1/2" guide combo? Or is there some trick or tool that will install these seals on a threaded guide without wrecking them?

Or do I give up and go with Teflon?

Thanks in advance for any suggestions.

Contact us to discuss your requirements of valve stem seal supplier. Our experienced sales team can help you identify the options that best suit your needs.

A client of mine did a RestoMod on a 3rd generation El Camino, that he's owned since new, having under 100K miles on the odometer. The engine, along with the rest of the drivetrain, was in good condition. The small block was a strong runner that did not smoke or use oil, however my client wanted to do through it just the same. Basically he did a complete engine re-gasket, including head gaskets, but no bearing or rings; he wanted to take care of the minor engine oil seepage he had and re-paint the factory color. The task was something he felt comfortable doing in his home garage with his expertise level. After the Camino was done he went on a shakedown road trip and noticed the engine was using oil like never before. He had to put in 2 quarts of oil in his 500 mile round trip journey.

So when he returned from his trip he called me and set up a time to bring the Camino so I could do a diagnostic on it, other than the excessive oil consumption the Camino ran like a champ, so he was at a loss as to what the problem could be.

Long story made short: when I pulled the spark plugs to gauge the combustion efficiency, I noticed all the spark plugs had carbon deposits on just one side of the center insulator, indicating to me that there was a valve stem seal issue. With compressed air injected into the spark plug holes, I removed the valve springs on each cylinder to inspect the valve stem o-ring seals. I found that every o-ring was twisted on each of the valve stems and this was the cause of the excessive oil consumption effect. The only way this could happen is if the o-rings had been put onto the valve stem before the spring was installed, and after speaking to my client, he confirmed that is exactly what he did; admiting he did not refresh himself on that operation even though he had the factory service manual on his workbench.

For more information, please visit motorcycle valve seal manufacturer.