300 tdi valves tight in stems

Karls · Jul 16, 2015

Recently removed the head, head gasket in good nick but some of the valves were a bit tight to remove from the guides - had to be tapped out with a punch and mallet. Most of the valve stem oil seals were knackered and some of the valves were majorly coked up.

What's caused the valves to be this tight in the guides? Is it the lack of stem oil seals?

Dippypud · Jul 16, 2015

Did you find any valve caps ?

Karls · Jul 16, 2015

Some had valve caps, some had remains of valve caps...the rest of the caps were in the sump.

Dippypud · Jul 16, 2015

Karls said:
Some had valve caps, some had remains of valve caps...the rest of the caps were in the sump.

Could be some had scored the stems on their journey to Pluto .....

Karls · Jul 16, 2015

Dippypud said:
Could be some had scored the stems on their journey to Pluto .....

Yeah maybe. Is that an issue for future use?

Turboman · Jul 16, 2015

Karls said:
Yeah maybe. Is that an issue for future use?

I think you can ream out the guides in situ in the head. Not done it on Tdi, but was common on older diesels.

crowmann · Jul 16, 2015

I found the same on my head - two valves needed gently drifting out and the level of coke around the inlet ports was off the scale and this on an engine with water injection albeit only for the past 10,000 miles out of 134,000.

Truly did not expect the state of the head when I got to inspect it.

All went back together well though after a full decoke, skim and three days in a power bath!

300 tdi valves tight in stems

Karls

Active Member

Dippypud

Never Knowingly Understood

Karls

Active Member

Dippypud

Never Knowingly Understood

Karls

Active Member

Turboman

Mab An Gov

crowmann

Active Member

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