Re-use head gaskets/o-rings?

[Terrence R]

I'm going back to a thicker base gasket on my 2012 ec300. If I take the head off, do I need new o rings, or can I re use the current ones?

[bkwdc]

You CAN reuse them. Just check close for any damage.

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[Anders]

On the other hand, you can replace the base gasket without removong the head from the cylinder.

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[Terrence R]

Originally Posted by Anders

On the other hand, you can replace the base gasket without removong the head from the cylinder.

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Actually, I have considered that. On the other hand, I was also considering measuring the squish. What's your take on re using piston rings? There's only 20 hrs on my current top end.

[Anders]

In that case I would just reuse the piston and rings. And you can also measure squish without removing the head although it may be easier to do when you remove / replace the head.

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[Jakobi]

I don't think you will get the cylinder and head off in one piece on the 12+ chassis. She's a pretty tight fit which takes some holding of the tongue in just the right place even with the head removed.

If the O-rings only have 20hrs on them I'd inspect and reuse. If not for $10 I'd replace them.

No point wasting money on rings/piston at 20hrs. By all means measure your end gap and compare to what they were installed at, but I'd say they'll still be well in spec.

Any comments/feedback on what you dislike about the current setup driving the change?

[Terrence R]

Originally Posted by Jakobi

I don't think you will get the cylinder and head off in one piece on the 12+ chassis. She's a pretty tight fit which takes some holding of the tongue in just the right place even with the head removed.

If the O-rings only have 20hrs on them I'd inspect and reuse. If not for $10 I'd replace them.

No point wasting money on rings/piston at 20hrs. By all means measure your end gap and compare to what they were installed at, but I'd say they'll still be well in spec.

Any comments/feedback on what you dislike about the current setup driving the change?

Yes you're right. It was a pretty tight slot getting the cylinder off when I took it off last time. However, I did pull the cylinder off with the head still attached the first time I took it apart. I had a stock .5mm base gasket in there. Then, Bought a wossner top end kit and used a thinner base gasket. I noticed that I did sign off a little earlier on top. It even had a bit of knocking due to the higher compression. That's why I'm looking to go back to the .5mm base gasket. I already ordered a new set of rings just incase. But what about seating the rings? Will the old ones seat again?