I got some new glow plugs for my old car [to get it half decent to sell it!] - but when taking the old glow plug out, the bit of the engine which the glow plugs screw into broke off! ...I was just asking what that bit is called, I'm not sure if its the cylinder head because I've looked at some images of cylinder heads and none of them have a top cover bit...
The top cover bit [which the glow plugs screw into] is what is broken, none of the internals! ...Can that be replaced on its own? if so does it have a name?
Cheers!
Edited by Webmaster on 20/11/2007 at 17:51
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Ehhh?? Where is this broken bit? Engine and year?
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Car: Peugeot 306 1.9Diesel XRD
Year: 1994 (added)
For photos, see eBay item: 140181191287, there's photos on there showing the broken bit.
Cheers. Matt!
Edited by Webmaster on 20/11/2007 at 17:51
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That is the cylinder head. You'll need a new head; or find some way of blocking that hole and retaining the pre-chamber [a specially machined bolt - or something] and running on three glowplugs.
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is it me or is the thread the plug screws into still not clearly in the head? if so tidying up the edges with a file then fitting a new plug should work?, the rest of the shroud behind the plug afaik is just to keep the elements at bay, put a new plug in and see if it'll nip up tight, if it does then start it up and check the plug stays in and see how it goes
chris
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Thomp
that was my immediate thought when I looked at the picture. It may also be worth measuring the length of thread for one the remaing tapped holes. I would also cf with the legth of thread on the glow plug. and possibly use the broken bit as a spacer to ensure the glow plug does not protrude too far into the combustion chamber.
If you can fit it in tightly and it only has 1 turn of thread holding it i wouldnt run the engine and bend over it without the bonnet securely fastened!
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pmh (was peter)
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Judging by the broken piece on the plug itself; I'd say that virtually all the thread is gone. Overtightening pushed off the spigot with the thread in it.
It may be possible to thread the remaining hole and fix a bolt in it - remembering that the glowplug may have some say in retaining the pre-chamber. [Is that a flush pin just above it?] You really, really, don't want one of those dropping out!
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Looks like you made a good job there!! If the casting that has broken off contains threading for the glow plug(which I presume it does) then the remaining thread will not be sufficient to hold the plug. Remember diesels are high compression.
Looks like a new head. Shame rest of car looks in good condition.
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Fullchat
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Thanks for clearing that up for me guys; I don't have a clue about engines! ...and just to clear it up for those who suggested to screw the plug into the remaining thread in the hole! ...I did try that but the threading on the plug doesn't reach the thread in the hole as theres a block bit in there! ...hard to explain, but if you look at the glow plug photo you will see that where the glow plug gets fatter there isn't thread on in, its smooth, and the thread starts further up the fatter part of the plug, so when you put it in the hole, theres a bit of metal in the hole that stops the glow plug from going in too far and it hits that so you cant get the thread on the glow plug to screw into the remaining thread in the hole! ...there is about 3 or 4 turns of thread remaining in the hole!
...But going back to the original question which was is the part actually called a cylinder head? Just to make sure my ebay item is correct!!! ...and yer, it was a bummer cause that car still has plenty of life left in her! ...but in looking on the good side I've now got myself a much nicer car! ...A 306 Turbo Diesel Sport, and its much more powerful and nicer to drive so its all good!!!!
pictures.autotrader.co.uk/imgser-uk/servlet/media?...5
Thanks again!
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Don't do a glow plug service on your new car!!!
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Fullchat
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My Brother-In-Law has a Citroen ZX with the 1.9 Indirect Injection engine. His cylinder head cracked around the glow-plug threads and he thought he was doomed to an expensive repair too. I'm a mechanical engineer and, looking at the damage, thought that a competent welder should be able to weld a plug in.
Took the car to the local garage and sure enough they managed to plug the hole and cap weld it sealed.
It's now got 3 good glow plugs and one capped off hole. Startd OK, a bit lumpy when really cold but was a cheap repair on a £400 car.
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I had very similar trouble with my sister's 1994 1.9D Zx last Christmas. Change the plugs on a N/A with a Lucas pump? Easy thought I, 1/2 hour tops...
15 mins later CRACK! and I had this bit in my hand: www.geocities.com/tricky992002/broken.jpg
fortunately there was just enough of the thread left in the block to nip the plug up, so we refitted it with some red Loctite and then covered the whole area with chemical metal:
www.geocities.com/tricky992002/repair.jpg
No, not pretty, and yes a total bodge, but it's still holding without trouble a year later and was much much easier and cheaper than a head change!
There seemed to be something wrong with the plugs - they were all tight in the head and this one appears to have stripped the top part of the thread then levered the chunk off the cylinder head. I wonder if some plugs came out of the factory with slightly wrong threads on them....
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RichardW
Is it illogical? It must be Citroen....
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RE: Fullchat "Dont do this repair on your new car"
...Too right!!! ...luckily the new car has got good plugs and takes just seconds to start up in the cold!!!! ...I'd say the easiest fix for this car was to do what I did and just buy a new one!!!!
...Looking at the photos from the Citroen, Looks very similar indeed... like the nice bodge job on the engine!!! ...Unfortunatley for me, there is no thread left in the engine for the plug to screw into so it would most definatley come flying off once the engine gets hot or something cause diesel is really high compression!!!! ...def woodn't want that thing flying through your bonnet at high speed, could cause some serious damage or even death!!!!
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I had a spark plug blow out of my Simca 1100 Special, left an interesting dent in the bonnet! No thread left at all so as a temporary bodge secured it using an L shaped bracket mounted to a nearby bolt. This bodge was still there nearly a year and many thousands of miles later when I sold it. (ok not so high compression as a diesel)
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