Omega Owners Forum
Omega Help Area => Omega General Help => Topic started by: Webby the Bear on 21 October 2013, 14:12:41
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Hi guys, hope you're well.
Ok, got two heads left from the rebuild. i'm going to remove the valves. Will they be hard to pull out bearing in mind they're bent? And will the carnage from ''when valve met piston'' have damaged the guides in any way?
Cheers :)
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Nothing a tap on the stem with a suitable
hammer drift won't move, assuming of course that they don't just fall out when the collets are removed :y
You'll be able to see/inspect the guides properly once the valves are out :y no point guessing before hand...
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ok, magic, thanks Al :) ill post up pics when i can get them out when im in school next.
are a set of new valves (for both heads) expensive and do we suggest any aftermarket or is it genuine?
finally, skimming..... if i decided to get them skimmed is this going to cause a problem with compression ratios?
:)
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skimming isn't recommended on these heads unless absolutely necessary, and if it was I would consider new heads. Taking material off the head face affects the bolts alignment in the V thus affecting the inlets.
Valves can be expensive from the stealer but 2nd hand should be reasonable, but make sure they are true :y
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Thanks guffer. touch wood theyre not needed so i can take my time. ill check ebay out for valves ;)
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Nothing a tap on the stem with a suitable hammer drift won't move, assuming of course that they don't just fall out when the collets are removed :y
You'll be able to see/inspect the guides properly once the valves are out :y no point guessing before hand...
Arrrrrrrrgh !! Collets (http://www.sternfannetwork.com/xen/styles/default/xenforo/smilies/banghead.gif)
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Nothing a tap on the stem with a suitable hammer drift won't move, assuming of course that they don't just fall out when the collets are removed :y
You'll be able to see/inspect the guides properly once the valves are out :y no point guessing before hand...
Arrrrrrrrgh !! Collets (http://www.sternfannetwork.com/xen/styles/default/xenforo/smilies/banghead.gif)
hahahaha i remember that day! ;)
i dont find collets bad at all. when you get in a rythm and youve got a spare 96 hours ;D
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Nothing a tap on the stem with a suitable hammer drift won't move, assuming of course that they don't just fall out when the collets are removed :y
You'll be able to see/inspect the guides properly once the valves are out :y no point guessing before hand...
Arrrrrrrrgh !! Collets (http://www.sternfannetwork.com/xen/styles/default/xenforo/smilies/banghead.gif)
hahahaha i remember that day! ;)
i dont find collets bad at all. when you get in a rythm and youve got a spare 96 hours ;D
Taking them out is no problem long as you dont drop them :-X Putting them back in is an art form , ask the collet master :'(
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Nothing a tap on the stem with a suitable hammer drift won't move, assuming of course that they don't just fall out when the collets are removed :y
You'll be able to see/inspect the guides properly once the valves are out :y no point guessing before hand...
Arrrrrrrrgh !! Collets (http://www.sternfannetwork.com/xen/styles/default/xenforo/smilies/banghead.gif)
hahahaha i remember that day! ;)
i dont find collets bad at all. when you get in a rythm and youve got a spare 96 hours ;D
Taking them out is no problem long as you dont drop them :-X Putting them back in is an art form , ask the collet master :'(
not that bad..... lots of grease on the end of a thin flat head ;) i thought the hbv you did was harder
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The heads I have done on Omega's with bent valves haven't created problems with the guides :y I would suggest fitting new stem seals being honest (I would only fit VX ones) as the price of them far out weighs the stress of wishing you had done them at a later date :y
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The heads I have done on Omega's with bent valves haven't created problems with the guides :y I would suggest fitting new stem seals being honest (I would only fit VX ones) as the price of them far out weighs the stress of wishing you had done them at a later date :y
Awesome. Thanks Daz, just remembering from when martin/symes did stem seals on steve's veccy..... the stem seals just sit on top of the guides, right?
:)
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Yeap. Can be sometimes awkward to remove... saw a pair once that looked like someone had used a chisel or something to remove them and mishaped the guides :o take your time :y putting them back on with a socket or something similar that fits over the top nicely of the stem seal should push them down without damaging :y
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cheers mate... just one final question... due to the tight interferemce fit am I right in thinking that should the guides need replacing this has to be done by a shop that will heat the head up to expand so the guides can be knocked out easily? .... or is there a home way of doing it?
:)
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You can remove and fit guides yourself.
You can possibly also ream them to size yourself.
But re-cutting the valve seat is a different matter!
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You can remove and fit guides yourself.
You can possibly also ream them to size yourself.
But re-cutting the valve seat is a different matter!
ok thanks mark. how much force do they take to come out?
what is reaming them to size? do i not just buy new huides and smack them in? also what depth do they go to?
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Guys, not bumping this thread. However, I am at home and am going to make a start on rebuilding these two cylinder heads.
Two quickies...
1.) Knowing that I had a couple of cam bearing cap bolts shear in the head i'm presuming the threads need redoing. Am I ok to use my new set of taps to do this?
2.) They're both quite dirty. To get them pristine can I literally bathe them in their entirety in diesel then take them to school and blow some compressed air over them?
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Guys, not bumping this thread. However, I am at home and am going to make a start on rebuilding these two cylinder heads.
Two quickies...
1.) Knowing that I had a couple of cam bearing cap bolts shear in the head i'm presuming the threads need redoing. Am I ok to use my new set of taps to do this?
2.) They're both quite dirty. To get them pristine can I literally bathe them in their entirety in diesel then take them to school and blow some compressed air over them?
Use CG's dishwasher before he gets rid. ::)
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Guys, not bumping this thread. However, I am at home and am going to make a start on rebuilding these two cylinder heads.
Two quickies...
1.) Knowing that I had a couple of cam bearing cap bolts shear in the head i'm presuming the threads need redoing. Am I ok to use my new set of taps to do this?
2.) They're both quite dirty. To get them pristine can I literally bathe them in their entirety in diesel then take them to school and blow some compressed air over them?
Use CG's dishwasher before he gets rid. ::)
??? ??? ??? ??? lol
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Suspect Mrs CG might have summat to say about that idea ;D
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Hi guys. Again ::)
I take it I can reuse the springs, collets and collars? or do they come in a valve kit when I get those? and will I have to keeo them all together in order of where they went? ( I assume not as there'll be new valves but worth asking :y
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Hi guys. Again ::)
I take it I can reuse the springs, collets and collars? or do they come in a valve kit when I get those? and will I have to keeo them all together in order of where they went? ( I assume not as there'll be new valves but worth asking :y
Yes, re-use them & yes again, but as you say, they all need to go where they came from. You need loads of old tubs marked up for the collets etc , you poke the valves through a piece of card marked up with their position :y :y :y
Doesn't matter if all new valves or re-cut valves where they go.
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Thanks Andy, ill raid me ma's sandwich bag department ::)
so basically.... new valves, new stem seals and new guides (if theyre shot from the explosion) :)
whats re-cut valves? :-[
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Valve grinding :y
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Valve grinding :y
It's a bit more than that. If you lap/grind a valve into a seat with a sucker & grinding paste, then you've a matched valve & seat in the head and you'd definitely keep that valve in that specific position. If you have a valve reground on a machine, then you effectively have a new valve.
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Thanks Andy, ill raid me ma's sandwich bag department ::)
so basically.... new valves, new stem seals and new guides (if theyre shot from the explosion) :)
whats re-cut valves? :-[
A new ground valve but done a machine ...... I suppose that 're-cut' is normally a term to used for the seat ;)
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ok thanks for that :y presumably the ones I buy will be brand new... or is it accepted that you can buy some ''re-manufactured'' ones? :)
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ok thanks for that :y presumably the ones I buy will be brand new... or is it accepted that you can buy some ''re-manufactured'' ones? :)
they'll be new, just pattern & a lot cheaper than OE. The last valves I bought were about 10 yrs ago for SWMBO Hyundai. Dealers wanted £30 a valve, pattern valves form a motor factor were £15 for the pair. It ran OK till it got side swiped with a skip waggon ??? ;) ;)
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ok thanks for that :y presumably the ones I buy will be brand new... or is it accepted that you can buy some ''re-manufactured'' ones? :)
they'll be new, just pattern & a lot cheaper than OE. The last valves I bought were about 10 yrs ago for SWMBO Hyundai. Dealers wanted £30 a valve, pattern valves form a motor factor were £15 for the pair. It ran OK till it got side swiped with a skip waggon ??? ;) ;)
hope everyone was ok andy???? :(
I take it I should still lap new valves in :-\
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hope everyone was ok andy???? :(
Yes, everyone was fine, it was a slow speed collision.
I take it I should still lap new valves in :-\
It won't do any harm, you should be looking for an even band of grey on the seat ie a bit that has been ground.
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thanks andy youre a star :y :y :y
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Valve grinding :y
get cracking webby 24 valves to lap in, by hand, that keep you bizzy for a couple of minutes :D
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Valve grinding :y
get cracking webby 24 valves to lap in, by hand, that keep you bizzy for a couple of minutes days :D
:y :y ;D ;D ;D ;D
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It is possible, with care, if the design of the head is suitable, to use a hand drill on the stem of the valve, alternately in forward and reverse, at low speed, to make the job easier. If the seats are not too bad, and particularly if using new valves, you can often get away with going with the fine paste straight away. HTH :y
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I've never used one, I've only ever used a sucker on a stick type, but this might be more suitable for you Webby :y And as Chris says above, you'll find that it won't take too long to bed a new valve to its seat even with fine paste.
http://www.ebay.co.uk/itm/22-28mm-Valve-Lapping-Grinding-Tool-/181211677567?pt=UK_Hand_Tools_Equipment&hash=item2a310ec37f
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I've never used one, I've only ever used a sucker on a stick type, but this might be more suitable for you Webby :y And as Chris says above, you'll find that it won't take too long to bed a new valve to its seat even with fine paste.
http://www.ebay.co.uk/itm/22-28mm-Valve-Lapping-Grinding-Tool-/181211677567?pt=UK_Hand_Tools_Equipment&hash=item2a310ec37f
Excellent idea, they were'nt around when I last did one. :y