HT leads melted / cant remove spark plug - MG-Rover.org Forums
 18Likes
Reply
 
LinkBack Thread Tools Rate Thread Display Modes
post #1 of 30 (permalink) Old 14-05-2017, 22:16 Thread Starter
Registered User
 
Join Date: May 2010
Car: MGF + ZR
Posts: 1,838
Thumbs down HT leads melted / cant remove spark plug

trying to change the spark plugs today, took ages to get the wires off, they had melted them selfs solid down the hole.

finaly got them off but cant get the spark plug socket to sit on?
super_cds is offline  
Sponsored Links
Advertisement
 
post #2 of 30 (permalink) Old 15-05-2017, 09:49
Registered User
 
Join Date: Jul 2012
Location: Hunstanton
Car: MGF
Posts: 3,356
long reach spark plug socket? it needs to be long reach and minimal diameter, because of where the spark plug hex sits in relation to the head. it could be because the top of the plug is fouling your socket.. or it wont fit in the space?

if its because the hex is fouled with melted plastic... then you need a good torch and look down the plug hole space... to see..

if its because the top of the plug fouls the socket.. you need a different socket...

http://www.mgf.ultimatemg.com/group2...sparkplugs.htm
super_cds likes this.

Last edited by Incony; 15-05-2017 at 10:02.
Incony is offline  
post #3 of 30 (permalink) Old 15-05-2017, 10:28 Thread Starter
Registered User
 
Join Date: May 2010
Car: MGF + ZR
Posts: 1,838
the socket worked ok on the zr a few months back, is the F different?
super_cds is offline  
 
post #4 of 30 (permalink) Old 15-05-2017, 17:35
Woof Woof
 
Join Date: Aug 2010
Location: Nottingham
Car: TF160 Disco 3.9 XR4i 4trak Yamaha XV535
Posts: 10,782
What do you think caused them to melt? Have you had an overheat?
super_cds likes this.
barkingdog is offline  
post #5 of 30 (permalink) Old 15-05-2017, 17:56
CJJ
Registered User
 
Join Date: Dec 2006
Location: Ashington, Northumberland
Car: MGTF 160, TF LE500, Nissan Leaf, KTM 990, Kangoo Van, Freelander 2.
Posts: 33,160
As said, you need a long reach magnetic socket, like this.





Although you should check that there is nothing still in the wells that will obstruct the socket.


I'm wondering if there is still parts of the cap on the top of the plugs.
super_cds likes this.
CJJ is offline  
post #6 of 30 (permalink) Old 15-05-2017, 20:05 Thread Starter
Registered User
 
Join Date: May 2010
Car: MGF + ZR
Posts: 1,838
will get a pic when it stops raining, not sure of the history of the car not had it long
that looks the same as the zr with the coil packs built in

this f has a distributor, maybe they changed the size
super_cds is offline  
post #7 of 30 (permalink) Old 15-05-2017, 20:55
Registered User
 
Join Date: Jul 2012
Location: Hunstanton
Car: MGF
Posts: 3,356
no the size has not changed
super_cds likes this.
Incony is offline  
post #8 of 30 (permalink) Old 15-05-2017, 21:07
Registered User
 
Join Date: Mar 2007
Location: Bridgend South Wales
Car: Rover 620ti, 2x 1996 MGF, 4x MG TF, Mazda Bongo, 2x 1999 MGF, 1972 Ford Cortina Mk3 Citroen Picasso
Posts: 1,317
If you've access to a compressor, not the small cigar lighter tyre type, get the airline down the holes to blow out all the crud and then try again. If you haven't access to a compressor, I suggest you go out and buy one, even if you only purchase a 25litre one, you'll soon be thinking why had you never bought one before or sooner
david.c and super_cds like this.
dert is offline  
post #9 of 30 (permalink) Old 15-05-2017, 21:34 Thread Starter
Registered User
 
Join Date: May 2010
Car: MGF + ZR
Posts: 1,838
looked like a melted candle twisting the lead i could hear cracking, thought it may of been the plug breaking but no.
it driped down over the silicone end and melted its self, to everything
super_cds is offline  
post #10 of 30 (permalink) Old 16-05-2017, 12:00
Stuck in the 80's...
 
IanMc's Avatar
 
Join Date: Jun 2009
Location: Braintree, Essex
Car: Flame Red '95 MGF, 17 Mini Cooper S, 13 VX Astra, 15 VX Corsa & 59 Fiesta.
Posts: 4,637
Secondary question of course, but what/whose leads were they?

If it were me I would be having a quiet word with the manufacturer or supplier...

---------------------------------------------------------------------------------------------------------------------------------------------


For .org forum only search results in Google, add "site:mg-rover.org" after your search criteria

Treat others as you would like to be treated yourself.
IanMc is online now  
post #11 of 30 (permalink) Old 16-05-2017, 12:32 Thread Starter
Registered User
 
Join Date: May 2010
Car: MGF + ZR
Posts: 1,838
got new leads now and they look all silicon soft, no hard plastic to melt

no idea of the make, cheap china crap i guess
super_cds is offline  
post #12 of 30 (permalink) Old 16-05-2017, 13:20 Thread Starter
Registered User
 
Join Date: May 2010
Car: MGF + ZR
Posts: 1,838
pics





super_cds is offline  
post #13 of 30 (permalink) Old 16-05-2017, 13:21 Thread Starter
Registered User
 
Join Date: May 2010
Car: MGF + ZR
Posts: 1,838
socket just spinds round and round due to all the melted crap around the out side of the plug

Last edited by super_cds; 16-05-2017 at 13:29.
super_cds is offline  
post #14 of 30 (permalink) Old 16-05-2017, 15:35
Registered User
 
Join Date: May 2012
Location: Bury
Car: R75 Mk2 1.8t, Mazda6 (Gen 2) TS2- 2.2TD
Posts: 916
Long thin cheap screwy and a blow torch. Heat the screwy and melt the plastic scraping it out as you go. May take a while to get enough out but should work. Just keep trying to get the socket on, keep doing this until you do.
super_cds likes this.
the chauffer is offline  
post #15 of 30 (permalink) Old 16-05-2017, 16:53 Thread Starter
Registered User
 
Join Date: May 2010
Car: MGF + ZR
Posts: 1,838
tried running the engine for a while hoping it would soften it a bit but no good

will give the blowtorch a try thanks
super_cds is offline  
post #16 of 30 (permalink) Old 17-05-2017, 16:20
Registered User
 
Join Date: Jul 2012
Location: Hunstanton
Car: MGF
Posts: 3,356
if the plug lead failed inside.. i.e broke internally, the you would get HV sparks inside the lead insulation.. in effect a spark that jumps in two places... at the plug and in the lead, to get to earth...

its going to do that because the lead has very good outer insulation... but the plug is still functioning as it should...

so.. with sparks jumping inside the lead... and they are hot... it will melt, cook, burn..

eventually the car will start to misfire because the burning lead destroys the internal conductor, the spark cant jump the bigger gap.. and cant reach the plug.

of course, the other point of possible bad contact could be the top of the plug itself...

but still the consequence can be the same... a double point jumping HV spark

and anything close to it.. will burn... and if it was you - and you have a better path to earth than the plug... you get a shock...

i cant imagine how you are getting a good connection on the plug, if you cant get a plug spanner in, to take it out, and examine it.. let alone trying to run the engine with it like that.


given that it was running with the engine at full temp, and that point of the head where the plug goes into can reach temperatures close to the exhaust temperature, since it is in the cylinder, then the crap in the plug can still not degrade, but just melt at temps maybe red hot...

a blow torch wont apply its heat in the right place.. because the head itself, is acting as a heat absorber,,


if you can.. you need to be brutal, and if you cant clear a way for the plug spanner to fit, by using time and a fine point chisel to chip away what is fouling the plug spanner placement, then another option might be to adapt a fine cut hole saw... to a tube , that you can turn by hand outside the head... and just keep turning - with pressure until you cut away the melted crap - and free a path .

its not going to be easy to to do any of that... and time and patience is the best way...

i dont think heat is the answer,,, the head acting as a heatsink is going to make that near impossible.

another option might be an industrial electric soldering iron, since its tip can melt solder and is big, ( quarter inch flat tip ) it might be used as a scooping collector, ( it will ruin the tip but might do it ) a bit at a time...

if you have any of the old leads and can see by comparison which bit melted, then see if a very hot bit of steel rod will melt it..

maybe you can just do that.. heat the rod... scoop the crap out... clean the rod, heat the rod again etc...

Last edited by Incony; 17-05-2017 at 16:56.
Incony is offline  
post #17 of 30 (permalink) Old 17-05-2017, 16:36 Thread Starter
Registered User
 
Join Date: May 2010
Car: MGF + ZR
Posts: 1,838
engine has been running fine, and the leads are still good
they are made from silicone with a hard plastic cover.
just the out side hard plastic melted and driped down the hole (you can see the run marks on the side wall) then set hard around the out side of the spark plug covering the gap around the out side.
super_cds is offline  
post #18 of 30 (permalink) Old 17-05-2017, 20:14
Registered User
 
Join Date: May 2008
Location: Scunthorpe
Car: Rover 400 (95-99)
Posts: 1,557
long flat bladed screw driver a few hits and should fracture / shatter the plastic , then get either air to blast it out or a piece of garden hose shoved in the end of a hoover should get it out i would also smash the top of the plug to aid in getting the hose down to the plastic you will find after the first piece comes out the rest should come straight out with 1 or 2 hits .
then give the spark plug a few turns with the spark plug socket then hoover the rest out then remove and replace the spark plug and move on to the next one if the rest are the same .
Andy400 is offline  
post #19 of 30 (permalink) Old 17-05-2017, 20:20
Registered User
 
Join Date: Jul 2012
Location: Hunstanton
Car: MGF
Posts: 3,356
so if its not the lead or the plug that caused the melt... but the heat of the engine... then i would go hot metal rod route, trying it on the same type of plastic first... you need and easy way of remelting the plastic, instantly.. even if only for a short time... and scoop the melted stuff out..,, clean and do it again.. and again... etc etc..

you might need to shape the end of the rod to help you... a bit of 6mm threaded studding hammered to a tip would do..?
Incony is offline  
post #20 of 30 (permalink) Old 17-05-2017, 21:18
Registered User
 
Join Date: Mar 2007
Location: Bridgend South Wales
Car: Rover 620ti, 2x 1996 MGF, 4x MG TF, Mazda Bongo, 2x 1999 MGF, 1972 Ford Cortina Mk3 Citroen Picasso
Posts: 1,317
Personally, I'd just get a plug socket really hot...as in able to melt plastic hot then push it onto the plug. The heat should melt any plastic around the plug enabling the socket to push down onto the plug
dert is offline  
Reply

Bookmarks

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the MG-Rover.org Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes Rate This Thread
Linear Mode Linear Mode
Rate This Thread:



Similar Threads
Thread Thread Starter Forum Replies Last Post
Spark plug leads ... MikeVincent MGF and MGTF (Sponsored by MGFnTFBITZ) 4 03-07-2013 14:57
TI spark plug leads HBOMB Rover 600 2 20-07-2012 13:01
spark plug HT leads spark_olo Other Manufacturer models 5 16-04-2008 16:48
Spark plug leads order julie11 MGF and MGTF (Sponsored by MGFnTFBITZ) 2 05-02-2008 19:50
Stalling - spark plug leads?? ikga33 MG/R Modification & Tuning 4 08-12-2005 08:36

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome