Range EFI 3,9 valve stem seals replace or not ?
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- Near Heathrow.
Yes
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The old rope down the cylinder trick to trap the valves in place when you release the collets but if the heads are on the bench it's definitely a good idea to "belt and braces" the job
- Posts
- 3,855
- Location
- Near Heathrow.
As the heads are on the bench do the whole job. Doesn't take long and def worth it.
1. Valve springs off & remove valve. Best to keep them in order.
2. Check for guide wear & side to side movement on valve stems.
3. Clean valve faces & stems. (easiest to do with drill mounted in vice & valve spinning in the drill)
4. Clean head
5. Lap the clean valves into the cleaned head.
6. Re-assemble including new stem seals.
It should run better afterwards.
1. Valve springs off & remove valve. Best to keep them in order.
2. Check for guide wear & side to side movement on valve stems.
3. Clean valve faces & stems. (easiest to do with drill mounted in vice & valve spinning in the drill)
4. Clean head
5. Lap the clean valves into the cleaned head.
6. Re-assemble including new stem seals.
It should run better afterwards.
Problem is that I need to change guides with the new sealsThe old rope down the cylinder trick to trap the valves in place when you release the collets but if the heads are on the bench it's definitely a good idea to "belt and braces" the job
- Posts
- 3,855
- Location
- Near Heathrow.
Why ? Valve seals usually slide over the valve stems & around the top of the guides.
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