RobHayes
Member
Registered: 6th Sep 03
Location: Lincolnshire
User status: Offline
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how do i remove the old ones?
got the new ones in the freezer so they should just slip in nice, but got to get the old ones out first
tried tapping them out but no joy
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hopper
Member
Registered: 14th Apr 02
Location: Stoke-on-Trent
User status: Offline
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i always thought that the guides were cut out, may be worth given it to and engineer, shouldnt cost to much
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Siberia
Member
Registered: 9th Oct 03
Location: Leprechaun Land Drives : Zafira GSI
User status: Offline
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they have to be pushed out by machine i think and also have to be redrilled/bored so that the valve sit right...
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RobHayes
Member
Registered: 6th Sep 03
Location: Lincolnshire
User status: Offline
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hmm, was planning on purchasing a drill/reamer combo 2moro and going for it that way.
maybe i'll get it done properly then
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fragpot
Member
Registered: 29th Feb 04
Location: Linlithgow, West Lothian
User status: Offline
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An engineering place will have them pressed in/out with a hydraulic press and a special rig. However you can remove them by:
1 - place head in oven @ 200 degrees
2 - remove with oven gloves or welding gauntlets
3 - place on an old bit of wood
4 - use a hold punch or similar and a hammer to smash them out (they only go in/out through the top, not the chamber)
5 - if they are not for moving, try using some lockite freezer spray, altho use the nozzle as 200 degrees to -40 in a split second will do your head no good if any of it sprays on.
Do 8 valves at a time then put it back in the oven, it will cool down pretty quickly.
To insert new ones, do the oven trick again and keep the guides in the freezer, bash them in with a hammer and observe the correct heights.
Still fancy it?
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RobHayes
Member
Registered: 6th Sep 03
Location: Lincolnshire
User status: Offline
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thats kinda what i was going to do 
but getting it done professionally instead now
£150ish with new valve seats cut and valves etc refitted
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fragpot
Member
Registered: 29th Feb 04
Location: Linlithgow, West Lothian
User status: Offline
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cool 
£150 is not too bad if your getting the seats recut etc. At least this way if anything goes wrong you can always go back, where as preheating a head to 200 degrees then beating it with a hammer and drift does sound dangerous.
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