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Engine Specific Info and Questions => IDI Engine => Topic started by: skifree on January 04, 2008, 08:44:53 am

Title: Grinding 1.6td valves
Post by: 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?

Title: Grinding 1.6td valves
Post by: Zulfiqar 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.

Title: Grinding 1.6td valves
Post by: Vincent Waldon 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.

Title: Grinding 1.6td valves
Post by: CoolAirVw 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.

Title: Grinding 1.6td valves
Post by: Zulfiqar 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.