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Home > Maintenance & Modifications > Our FreeDeux's got a bad head... Cylinder Head |
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TXFireblade Member Since: 30 Apr 2013 Location: Houston Posts: 43 |
I'm in Houston, PM and let me know what you need and I'll see if I can help. |
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24th Jul 2019 5:59 pm |
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768will Member Since: 08 Jan 2012 Location: South Devon Posts: 199 |
Houston, She has a problem 11 GS Bali Blue
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25th Jul 2019 3:13 pm |
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Boxbrownie Member Since: 17 Mar 2019 Location: Looe Posts: 2053 |
Lets hope Houston uses Apollo 11 and not Apollo 13 then.........
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25th Jul 2019 4:51 pm |
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Emma Scully Member Since: 31 Aug 2017 Location: Hampshire Posts: 93 |
Ah the autumn season appears like the ghost mist of early morning, the changing colours of the trees and all the furry and feathery things busy collecting… Ah sorry… Wrong forum!! 😊..
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1st Oct 2019 4:42 pm |
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dorsetfreelander Member Since: 20 Jul 2013 Location: Dorset Posts: 4354 |
I very much admire your tenacity but at risk of sounding defeatist I would have bought a complete engine from a scrapyàrd in the UK and got it shipped to france or hired a van. 3 x FL1 2 manual + 1 auto
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1st Oct 2019 6:03 pm |
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Emma Scully Member Since: 31 Aug 2017 Location: Hampshire Posts: 93 |
Good morning DF,
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2nd Oct 2019 7:16 am |
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SYFL2 Member Since: 16 Jun 2012 Location: Sheffield Posts: 2594 |
Emma are you in Australia ? |
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2nd Oct 2019 7:42 am |
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dondiddy Member Since: 16 Apr 2017 Location: Hamilton Posts: 753 |
Does the head from the States still have the valves and camshafts fitted? If so I would have it pressure tested and if ok fit it as is with no further work. Upon reassembly I would turn the engine over by hand multiple times to ensure that there is no piston valve contact. |
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2nd Oct 2019 7:58 am |
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Badger51 Member Since: 01 Mar 2014 Location: Coffs Harbour Posts: 962 |
"So, if the head is skimmed, do the shims need to be thicker or thinner to compensate? "
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2nd Oct 2019 8:15 am |
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Emma Scully Member Since: 31 Aug 2017 Location: Hampshire Posts: 93 |
Hi Nick, thank you for your reply, apologies for confusing you.
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2nd Oct 2019 10:10 am |
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dondiddy Member Since: 16 Apr 2017 Location: Hamilton Posts: 753 |
Emma, Everything that has happened points to incorrect valve timing so you now need to start going over everything that you have done up to this point to try and find out where the problem lies. Although you are sure that you have timed it up correctly the bent valves are saying different so there is something wrong somewhere that is getting missed. You mentioned earlier in this thread that the camshafts had been mixed up by the engineering shop and that you had to change them over. Double check that again and compare with your new head (if it has cams fitted). Not trying to say you have done something wrong but you have the same bent valve problem again so you must now assume that something that looks correct is in fact wrong. If it`s bent exhaust valves all the time then that narrows it down a bit to the exhaust camshaft timing. Did timing belt on a Clio DCI once and could not get it timed properly. Turned out the little keyway on the camshaft pulley had broken off meaning that the pulley although still tight had moved enough on the camshaft to alter the timing. Took a bit of time to work that out but did in the end by going over everything again and not assuming just because it looked ok that it actually was. Good luck! |
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2nd Oct 2019 10:32 am |
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Emma Scully Member Since: 31 Aug 2017 Location: Hampshire Posts: 93 |
Hi DD, thanks for your advice. As you say it does keep pointing to timing, and I have replaced the timing chain and tensioner.
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2nd Oct 2019 1:34 pm |
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dondiddy Member Since: 16 Apr 2017 Location: Hamilton Posts: 753 |
Emma, If it is bending the same valves every time then I would be looking at those valves as a starting point and not worrying too much about the rest. If you have valves that are not closing properly is this down to a lack of clearance or because they have become bent? I would very much doubt that having the shims mixed up would make a huge difference as they should all be pretty close to each other in terms of dimensions. (Grasping at straws) Did you check the length of the new valves matched exactly the old valves before they were fitted? |
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2nd Oct 2019 2:20 pm |
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Boxbrownie Member Since: 17 Mar 2019 Location: Looe Posts: 2053 |
I assume all the pistons are raising to exactly the same point in their bores?
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2nd Oct 2019 4:02 pm |
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