Omega Owners Forum - Project Tractor engine swap

TheBoy Administrator Offline TBE has an MOT! Posts: 64817 Brackley, Northants Gender: Drives: 98 MV6, 03 Elite, 00 25, 89 ZX10	Re: Project Tractor engine swap Reply #465 - 01. Oct 2007 at 22:08 sassanach wrote on 01. Oct 2007 at 21:14: 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...
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sassanach Senior Member Offline Posts: 805 trowbridge Gender:	Re: Project Tractor engine swap Reply #466 - 01. Oct 2007 at 22:16 remove the head from the doner engine first and get it pressure tested and if needed skimmed.
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Taxi Driver

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Re: Project Tractor engine swap
Reply #467 - 01. Oct 2007 at 22:18

TheBoy wrote on 01. Oct 2007 at 22:08:

sassanach wrote on 01. Oct 2007 at 21:14:

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 Angry

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TheBoy

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Re: Project Tractor engine swap
Reply #468 - 01. Oct 2007 at 22:23

sassanach wrote on 01. Oct 2007 at 22:16:

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/

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JamesV6CDX Ex Member Gender: Drives: 2002 (02) 3.2 Retail MV6 in Star Silver with Leather	Re: Project Tractor engine swap Reply #469 - 01. Oct 2007 at 22:24 Let me know when it is, I quite fancy helping, if I'm free.
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sassanach Senior Member Offline Posts: 805 trowbridge Gender:	Re: Project Tractor engine swap Reply #470 - 01. Oct 2007 at 22:33 cant skim the head? i will check that out tomorrow.
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TheBoy Administrator Offline TBE has an MOT! Posts: 64817 Brackley, Northants Gender: Drives: 98 MV6, 03 Elite, 00 25, 89 ZX10	Re: Project Tractor engine swap Reply #471 - 01. Oct 2007 at 22:35 sassanach wrote on 01. Oct 2007 at 22:33: cant skim the head? i will check that out tomorrow. See PDF a couple of posts above, states cannot be skimmed.
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Entwood

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Re: Project Tractor engine swap
Reply #472 - 01. Oct 2007 at 22:44

yup.... page 38 .. item 43 Sad

... now thats not good news Sad

Quote:

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

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Martin Imber

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Re: Project Tractor engine swap
Reply #473 - 01. Oct 2007 at 23:51

Entwood wrote on 01. Oct 2007 at 22:44:

yup.... page 38 .. item 43 Sad

... now thats not good news Sad

Quote:

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'

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Kevin Wood

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Re: Project Tractor engine swap
Reply #474 - 02. Oct 2007 at 00:34

Quote:

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

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Omegatoy

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Re: Project Tractor engine swap
Reply #475 - 02. Oct 2007 at 01:53

Kevin Wood wrote on 02. Oct 2007 at 00:34:

Quote:

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

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TheBoy Administrator Offline TBE has an MOT! Posts: 64817 Brackley, Northants Gender: Drives: 98 MV6, 03 Elite, 00 25, 89 ZX10	Re: Project Tractor engine swap Reply #476 - 02. Oct 2007 at 08:59 Surely the fact the the donor hasn't suffered HG failure, no skimming/machining required?
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Kevin Wood Global Moderator Admin Team Offline Posts: 20377 Alton, Hampshire Gender: Drives: 3.2 MV6 (LPG), Westfield	Re: Project Tractor engine swap Reply #477 - 02. Oct 2007 at 09:21 Quote: 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
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Jay w

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Re: Project Tractor engine swap
Reply #478 - 02. Oct 2007 at 13:25

TheBoy wrote on 01. Oct 2007 at 22:08:

sassanach wrote on 01. Oct 2007 at 21:14:

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

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sassanach Senior Member Offline Posts: 805 trowbridge Gender:	Re: Project Tractor engine swap Reply #479 - 02. Oct 2007 at 20:24 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.
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