Author Topic: Grinding 1.6td valves (Read 2669 times)

skifree · « **on:** January 04, 2008, 08:44:53 am »

Is it ok to grind 1.6td valves for a valve job? or do they need to be replaced because of a coating on them?

Zulfiqar · « **Reply #1 on:** January 04, 2008, 11:08:36 am »

Coating? - word is that VW TD valves are sodium filled, like those in the high revving evo engines and mercedes multivalve heads.

just go ahead and do a lap job on it, and you are good to go for grinding, just make sure 101% that your valve stem height comes out at exact spec without much shrouding on the face side - it matters like night and day for these engines.

Vincent Waldon · « **Reply #2 on:** January 04, 2008, 11:19:08 am »

The Bentley says: seats and exhaust valves are lap only... not to be ground.

So I hand-lap them all. So far, so good.

CoolAirVw · « **Reply #3 on:** January 04, 2008, 01:15:06 pm »

I read somewhere that sodium filled exhaust valves have the possiblility of exploding when ground. I dont beleive everything I read but I think something along those lines is why Bently says lap only.

My machine shop recommends replacing them with stainless.

Zulfiqar · « **Reply #4 on:** January 04, 2008, 11:37:31 pm »

the sodium is in the valve stem, just dont go ahead n cut it in two,

Most of the time a lap job is only that is needed if you get OEM spec valves, and yes stainless are a good idea too.