Um, I don't think my engine will last the winter! (Fixed)

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Um, I don't think my engine will last the winter! (Fixed)

Postby grim_b » 18 Nov 2005, 10:17

So there is it then.

I had a day off and decided to take a look at my spark plugs... Plug 1(Nearest the front of the car), 3 and 4 came out with little trouble. Plug 2 just turns round and round..... :? :?: :?

Can anyone suggest why this would be? It is not lose in anyway, but I get the feeling that the plug screws into a port that is not part of the actual engine? (I know nothing about this, so an idiots guide is needed please :roll: ) and it is that that is no longer doing its job?

So at the end of the day, she runs but only 3 of the 4 are gapped right and I have no idea how to resolve this problem. :oops:

Thanks in advance as I just know that you will be able to advise.
G. :cry:
Last edited by grim_b on 30 Nov 2005, 11:34, edited 1 time in total.
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Postby shuvit-tim » 18 Nov 2005, 10:23

sounds like you've threaded the plughole to me. I'm not sure on the build of the chevette engine - if it were a cast head you'd need to have it retapped or helicoiled (should cost about £25). But I dont think chevette heads are cast are they? Can the sparkplug port be replaced on a chevette engine??
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Postby grim_b » 18 Nov 2005, 12:29

:( Sorry but I did say this thread was going to be a bit "idiots guide"ish :(

So, am I right in thinking that the actual plug screws into a port that in tern is not a part of the actual engine (head?) and it is this that is spinning not the plug's thread? possibly?
:?:

The car is the Chevette L Hatch on a Y plate with completely standard equipment with the exception on the exhaust and a K&N Replacement can.
It has 51K on the clock and I really want to get this fixed. To the point of monitoring this post every minute free. :roll: :wink:

Cheers all,
G.
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Postby Herbie_Flowers » 18 Nov 2005, 12:38

i don't understand how the plug cannot be loose yet still spins. are you able to pull the plug out at the same time turning it anti-clockwise to see if it can bite on a thread?
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Postby grim_b » 18 Nov 2005, 12:48

I am trying to make a list of things to try out with suggestions. thanks.

I use a plug socket and it fits right over the plug to the engine. I have about 6 stone of weight on it to move it, but the whole thing seems to turn. The force needed to do this is constant even after the third or fourth turn. Could I shock the plug free from the housing it is stuck in? Perhaps try a jolt on the handle of the tool to break any seal that has formed?

:wink: :cry: :wink:

Any more things you can think of for me to try tonight?
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Postby Doive » 18 Nov 2005, 12:48

I think the chevette has a cast head, the plug threads are generally extremely robust, they even survived my ham fisted plug replacement attempts! Very strange to see one that has stripped. Sounds like that is what has happened. My only concern would be that a stripped thread will produce swarf, and turning it in the hole will have dropped some of it into the engine. You may need to take the head off to fix this one....
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Postby grim_b » 18 Nov 2005, 12:50

Doive, is that hard? How long would a complete newbe take to do it?
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Postby Doive » 18 Nov 2005, 13:00

Shouldn't be that hard, need to whip the manifolds off, undo the various hoses, take the valvetrain off and then take the head off. You may not need to do this, I'm just thinking of how to stop swarf falling into the engine if you do get the thread retapped.
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Postby Herbie_Flowers » 18 Nov 2005, 13:06

use grease on the tap :wink:
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Postby Herbie_Flowers » 18 Nov 2005, 13:09

grim, go and get everything you will need to do the job before you start doing it ie. "spark plug" helicoil kit, grease and a new spark plug(s)
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Postby grim_b » 18 Nov 2005, 15:27

Herbie_Flowers wrote:grim, go and get everything you will need to do the job before you start doing it ie. "spark plug" helicoil kit, grease and a new spark plug(s)


As predicted, you people are the best :D

Now, What is a Helicoil and what do you do with it?

Doive, any chance of a "rough guide to....?" post? I could really do with someones as near to step by step example. Seeing as the only companion on this mission is gypsy and the Haynes manual, a real persons experience would help loads.

You guys gave me the incentive to replace my caliper and exhaust so far, I just know I could probably do this and save the car.

Cheers all,
G. :D
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Postby iety2004 » 18 Nov 2005, 15:31

Are u sure the spark plug itself hasn't snapped? the top bit coming away from the threaded half?
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Postby Herbie_Flowers » 18 Nov 2005, 15:33

have a look at this for a better understanding. it's dead easy to do ok....don't be afraid 8)
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Postby grim_b » 18 Nov 2005, 15:34

iety2004 wrote:Are u sure the spark plug itself hasn't snapped? the top bit coming away from the threaded half?


How would I know?
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Postby grim_b » 19 Nov 2005, 02:15

I havent managed a look at the engine tonight as I have two pre 4 year olds that are not well at the moment. That I have been keeping myself busy with a wood project at the moment so space is limited in my garage.

I have spoken to a few people now and it would appear that I will be in for a strip and re-bore, Helicoil etc now.
My brother sugested I look into getting another head and cleaning one up.

I keep thinking that this is the perfect time to get the oil changed and the new water pump on, but this all seems so much for me to undertake seeing as I have no experience?? :roll:

There was a mention of having to do something with setting the engine in a certain turn and locking it with bolts in the pully wheels or something. (I wish I could find the haynes under all that wood at the moment. :(

Still, night all. (Erm, morning?)
G.
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Postby Harry Flatters » 19 Nov 2005, 11:50

If you've got the standard 1256 it's an ideal engine to learn on, nice and simple.

When they're talking about locking pulleys they're probably thinking of modern OHC engines where you have to remove the timing gear - normally a toothed belt - to remove the head. You don't have to worry about that with a 1256, it's all in the bottom end.

Personally given your level of expertise & costs I'd get an engineer to helicoil it if needs be.

I assume the plug's still taking some force to turn it, it's just rotating not coming out - in which case it's almost certainly a stripped thread.
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Postby shuvit-tim » 21 Nov 2005, 01:29

i'd get a few quotes on getting it done professionally and see if it's less hassle just to give it to a professional
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Postby Shellysowner » 21 Nov 2005, 01:40

shuvit-tim wrote:i'd get a few quotes on getting it done professionally and see if it's less hassle just to give it to a professional


Honestly - is that the right attitude to take Tim? 'Why don't we just pay someone to do it'? Dear oh dear :? :lol:
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Postby shuvit-tim » 21 Nov 2005, 02:35

you're asking by his own confession a complete newbie to take a head apart and helicoil a cast head - somethign which requires a fair amount of precision. My point is this - my friend had a stripped plughole rebored for £20. For the sake of £20 is it worth risking fecking your engine for the sake of a little experience? It'll probably cost you £20 for the helicoil kit!
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Postby Herbie_Flowers » 21 Nov 2005, 10:20

shuvit-tim wrote:somethign which requires a fair amount of precision.

it just involves screwing a tap into the plug hole to cut a new thread for the helicoil, hardly rocket science :)
shuvit-tim wrote:It'll probably cost you £20 for the helicoil kit!

helicoil kits cost double maybe triple that, however, there is a very high probability of the sparkplug locking itself to the helicoil so when you remove the sparkplug it will unscrew the helicoil with it so you will have to insert a new one anyway which will already be in the kit.
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Postby chris(not) » 21 Nov 2005, 14:03

If it's cost that's overriding, could well be cheapest just to stuff a complete secondhand engine in! You won't need to buy anything else then- even a head gasket set and useable S/H head would probably cost more :(

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Postby Shellysowner » 21 Nov 2005, 14:24

If you're really desperate Grim then I've got a 25,000 mile head you can have - the only drawback from your point of view being that I'll want you to buy me one to replace it at some point!
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Postby Harry Flatters » 21 Nov 2005, 18:15

Don't know, Herbie, helicoiling may not be that straightforward depending what a mess the plug port is, and learning at the deep end might be a way of increasing the chances of problems with the helicoil down the road.

Given Grim's level of knowledge I'd go for the head / engine job but leave the helicoil to the engineers, both for cost and results.
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Postby grim_b » 21 Nov 2005, 22:37

Its been a few days since I read this thread, but in the light of your worries about the magnitude of this task.... :? That and I have just found out that I may have to comunte on a daily basis, I think I will have to leave it be for a bit.... :cry: The Car's future is in the balance now as I 40 mile round trip for my much loved car now is something I wouldn't risk.

I will think about it some more... :lol:

Thanks for the advice guys (and offers :) )

G.
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Postby jifop » 21 Nov 2005, 22:45

grim_b wrote:Its been a few days since I read this thread, but in the light of your worries about the magnitude of this task.... :? That and I have just found out that I may have to comunte on a daily basis, I think I will have to leave it be for a bit.... :cry: The Car's future is in the balance now as I 40 mile round trip for my much loved car now is something I wouldn't risk.

I will think about it some more... :lol:

Thanks for the advice guys (and offers :) )

G.


i do a 70 mile round trip everyday! did it in the vette and in the square
Before you say anything..... no i cant spell or type!

The post above is my own personal opinion, it is not meant to upset or cause offence, if it does bugger off.

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