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[TheBoy]

when is that bl%%dy head coming off!!!

Locking kit arrived at the weekend, so as soon as I can find someone clever to help!  Weather looking good from Wed onwards, so if anyone available, I'll take a day off...

[sassanach]

remove the head from the doner engine first and get it pressure tested and if needed skimmed.

[Taxi_Driver]

when is that bl%%dy head coming off!!!

Locking kit arrived at the weekend, so as soon as I can find someone clever to help!  Weather looking good from Wed onwards, so if anyone available, I'll take a day off...

Monday/Tues/Wed next week i can come and get in the way......need to work the rest of this week.....missed payday weekend this weekend.....coz off bloody blower fan  

[TheBoy]

remove the head from the doner engine first and get it pressure tested and if needed skimmed.

Apparently, you cannot skim this head!

I was waiting until someone clever was available, so we could 'practice' on donor to see easiest way of removal...

http://images.omegaowners.com/documents/25TD/

[JamesV6CDX]

Let me know when it is, I quite fancy helping, if I'm free.

[sassanach]

cant skim the head? i will check that out tomorrow.

[TheBoy]

cant skim the head? i will check that out tomorrow.

See PDF a couple of posts above, states cannot be skimmed.

[Entwood]

yup....  page 38 .. item 43   ... now thats not good news  

43. Using a straight edge and feeler gauges, check
cylinder head for distortion along lines shown in
illustration and compare with figures given:
Longitudinal warp A = 0.1 mm (0.004 in)
Lateral warp B = 0.05 mm (0.002 in)
44. Replace cylinder head if figures obtained exceed
those given.
NOTE: Cylinder heads may not be refaced

[Martin_1962]

yup....  page 38 .. item 43   ... now thats not good news  

43. Using a straight edge and feeler gauges, check
cylinder head for distortion along lines shown in
illustration and compare with figures given:
Longitudinal warp A = 0.1 mm (0.004 in)
Lateral warp B = 0.05 mm (0.002 in)
44. Replace cylinder head if figures obtained exceed
those given.
NOTE: Cylinder heads may not be refaced

I look upon that as a challenge myself - I wouldn't worry over say 10 thou'

[Kevin Wood]

I look upon that as a challenge myself - I wouldn't worry over say 10 thou'

I agree. There's no logic behind it. There should be millimetres of clearance between valves and pistons so a few thou to reface the head won't do a lot. It won't alter the valve timing by any significant degree. It won't affect compression that much, and if it is a concern you can always skim down the pistons to match (although it's a lot more work stripping down, of course).

Sounds like a ploy to make you buy a new head to me.

The Haynes manual for my Zetec engine says no oversize pistons, bearings, etc. available. That wasn't the case when I decided to re-bore it.

However, as the donor engine hasn't had a head gasket failure or been cooked it's unlikely to need a skim.

Kevin

[Omegatoy]

I look upon that as a challenge myself - I wouldn't worry over say 10 thou'

I agree. There's no logic behind it. There should be millimetres of clearance between valves and pistons so a few thou to reface the head won't do a lot. It won't alter the valve timing by any significant degree. It won't affect compression that much, and if it is a concern you can always skim down the pistons to match (although it's a lot more work stripping down, of course).

Sounds like a ploy to make you buy a new head to me.

The Haynes manual for my Zetec engine says no oversize pistons, bearings, etc. available. That wasn't the case when I decided to re-bore it.

However, as the donor engine hasn't had a head gasket failure or been cooked it's unlikely to need a skim.

Kevin

Nothing to do with head thickness, its down to the inserts of the precombustion chambers, thats why it cant be skimmed
Omegatoy

[TheBoy]

Surely the fact the the donor hasn't suffered HG failure, no skimming/machining required?

[Kevin Wood]

Nothing to do with head thickness, its down to the inserts of the precombustion chambers, thats why it cant be skimmed

Ahh! That does make sense actually.

Kevin

[Jay w]

when is that bl%%dy head coming off!!!

Locking kit arrived at the weekend, so as soon as I can find someone clever to help!  Weather looking good from Wed onwards, so if anyone available, I'll take a day off...

if you need help over the weekend drop me a PM

[sassanach]

having consulted the oracle as always there is theory and practice,you CAN skim the head if needed.therefore i repeat myself ,remove the doner head and get it checked .do it once, do it right.