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Author Topic: Head rebuild questions  (Read 2616 times)

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Webby the Bear

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Re: Head rebuild questions
« Reply #15 on: 24 October 2013, 14:39:42 »

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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Shackeng

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Re: Head rebuild questions
« Reply #16 on: 24 October 2013, 16:35:21 »

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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Webby the Bear

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Re: Head rebuild questions
« Reply #17 on: 24 October 2013, 18:30:17 »

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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05omegav6

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Re: Head rebuild questions
« Reply #18 on: 25 October 2013, 02:37:01 »

Suspect Mrs CG might have summat to say about that idea ;D
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Webby the Bear

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Re: Head rebuild questions
« Reply #19 on: 01 November 2013, 21:12:30 »

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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Andy B

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Re: Head rebuild questions
« Reply #20 on: 01 November 2013, 21:19:31 »

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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Webby the Bear

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Re: Head rebuild questions
« Reply #21 on: 01 November 2013, 21:27:11 »

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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martin42

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Re: Head rebuild questions
« Reply #22 on: 01 November 2013, 21:33:19 »

Valve grinding  :y
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Andy B

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Re: Head rebuild questions
« Reply #23 on: 01 November 2013, 21:35:50 »

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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Andy B

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Re: Head rebuild questions
« Reply #24 on: 01 November 2013, 21:37:38 »

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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Webby the Bear

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Re: Head rebuild questions
« Reply #25 on: 01 November 2013, 21:40:33 »

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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Andy B

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Re: Head rebuild questions
« Reply #26 on: 01 November 2013, 21:51:30 »

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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Webby the Bear

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Re: Head rebuild questions
« Reply #27 on: 01 November 2013, 22:19:26 »

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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Andy B

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Re: Head rebuild questions
« Reply #28 on: 01 November 2013, 22:41:45 »

.....

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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Webby the Bear

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Re: Head rebuild questions
« Reply #29 on: 02 November 2013, 00:03:38 »

thanks andy youre a star  :y :y :y
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