Diesel glow plug removal

Diesel glow plug removal

Author
Discussion

Discopotatoes

Original Poster:

4,101 posts

221 months

Saturday 26th November 2016
quotequote all
I've got a glow plug down on my 335d touring bmw, so have done some research into changing them out and found some horror stories of snapped ends and fun and frolics of getting the broken bits out.
Is there a fool proof way to get them out without snapping them?
cheers

Petrolhead_Rich

4,659 posts

192 months

Sunday 27th November 2016
quotequote all
Not really, lots of WD-40 on them before you remove them, they tend to either pop out easily or snap and break and are complete bds, there is no in-between! frown

Penelope Stopit

11,209 posts

109 months

Monday 28th November 2016
quotequote all
How about warming up the engine before doing the job or is that creating a burnt hands problem

t400ble

1,804 posts

121 months

Monday 28th November 2016
quotequote all
Dont bother with WD40, get some penetrating fluid at least

227bhp

10,203 posts

128 months

Monday 28th November 2016
quotequote all
Penelope Stopit said:
How about warming up the engine before doing the job or is that creating a burnt hands problem
Not on a modern diesel wink

It's one of those jobs that you either take a risk on, or take it to a Pro with the right equipment and pay them. They are expensive things to pull though, circa £100 per glow plug or injector at some places, but then what price is being able to drive in at 9am and drive back home at 5 knowing the job has been done properly V trying yourself, the top breaking off and being left with no car.
Penetrating oil is useless, it doesn't reach to places it needs to, alot of garages don't even bother trying themselves any more, they just get the expert in.

GreenV8S

30,195 posts

284 months

Monday 28th November 2016
quotequote all
227bhp said:
They are expensive things to pull though
Presumably they're pricing in some allowance for things going wrong, so that price could indicate how problematic this job is.

Penelope Stopit

11,209 posts

109 months

Monday 28th November 2016
quotequote all
227bhp said:
Penelope Stopit said:
How about warming up the engine before doing the job or is that creating a burnt hands problem
Not on a modern diesel wink

It's one of those jobs that you either take a risk on, or take it to a Pro with the right equipment and pay them. They are expensive things to pull though, circa £100 per glow plug or injector at some places, but then what price is being able to drive in at 9am and drive back home at 5 knowing the job has been done properly V trying yourself, the top breaking off and being left with no car.
Penetrating oil is useless, it doesn't reach to places it needs to, alot of garages don't even bother trying themselves any more, they just get the expert in.
Ok, thanks for this, I always thought heat and expansion woul help

227bhp

10,203 posts

128 months

Monday 28th November 2016
quotequote all
GreenV8S said:
Presumably they're pricing in some allowance for things going wrong, so that price could indicate how problematic this job is.
No, if it breaks they charge you more to remove it in pieces!

227bhp

10,203 posts

128 months

Monday 28th November 2016
quotequote all
Penelope Stopit said:
227bhp said:
Penelope Stopit said:
How about warming up the engine before doing the job or is that creating a burnt hands problem
Not on a modern diesel wink

It's one of those jobs that you either take a risk on, or take it to a Pro with the right equipment and pay them. They are expensive things to pull though, circa £100 per glow plug or injector at some places, but then what price is being able to drive in at 9am and drive back home at 5 knowing the job has been done properly V trying yourself, the top breaking off and being left with no car.
Penetrating oil is useless, it doesn't reach to places it needs to, a lot of garages don't even bother trying themselves any more, they just get the expert in.
Ok, thanks for this, I always thought heat and expansion would help
It was a sly swipe at the fact that modern diesels are notoriously cool runners, I think you'd be unlucky to burn your hand on one biggrin

If I was to start the job from scratch with no knowledge I would have done as you suggested, only I would have taken it a step further and hit it with some freeze spray before acting quickly, I'm told it doesn't work though.

There are plenty of experts countrywide doing it now, this lot up North have an interesting home page (despite being about 3 miles long) http://www.injectorsremovals.co.uk/
Prices and the levels of desperation are evident and the last few pics are quite funny. laugh
You can see the makers name on the equipment, trace that to their website and Youtube too for more info.

Martin350

3,775 posts

195 months

Monday 28th November 2016
quotequote all
If you do attempt it yourself and it breaks there's always one of these kits, if you have enough room to get the tools in there.

(This one is just an example, there are loads of different kits out there).

GreenV8S

30,195 posts

284 months

Monday 28th November 2016
quotequote all
227bhp said:
No, if it breaks they charge you more to remove it in pieces!
After seeing some of those horror stories, suddenly £100 doesn't sound so bad.

Hainey

4,381 posts

200 months

Monday 28th November 2016
quotequote all
Take the engine for a run and get it warm, it does help.

Then spray copious amounts of Plus Gas on them (do NOT use WD40, its a water displacement spray NOT a release agent) and then go have a cup of tea.

Then do the job. Take note of the torque when you put them back in and make sure you have a low numerical value torque wrench. On the BMW its 20nm (from memory) and it feels like piss all when you tighten it, but that's the value and don't go above it.

I've done literally hundreds of glow plugs and never snapped one yet. I did a set at the weekend in fact on a Volvo D5 (8nm torque, soft soft head casting) It's not hard just be mindful of what you are doing.


paintman

7,687 posts

190 months

Monday 28th November 2016
quotequote all
227bhp said:
It was a sly swipe at the fact that modern diesels are notoriously cool runners, I think you'd be unlucky to burn your hand on one biggrin

If I was to start the job from scratch with no knowledge I would have done as you suggested, only I would have taken it a step further and hit it with some freeze spray before acting quickly, I'm told it doesn't work though.

There are plenty of experts countrywide doing it now, this lot up North have an interesting home page (despite being about 3 miles long) http://www.injectorsremovals.co.uk/
Prices and the levels of desperation are evident and the last few pics are quite funny. laugh
You can see the makers name on the equipment, trace that to their website and Youtube too for more info.
Very entertaining. You can almost hear the rising panic in those that did some of the bodges!

Penelope Stopit

11,209 posts

109 months

Tuesday 29th November 2016
quotequote all
227bhp said:
Penelope Stopit said:
227bhp said:
Penelope Stopit said:
How about warming up the engine before doing the job or is that creating a burnt hands problem
Not on a modern diesel wink

It's one of those jobs that you either take a risk on, or take it to a Pro with the right equipment and pay them. They are expensive things to pull though, circa £100 per glow plug or injector at some places, but then what price is being able to drive in at 9am and drive back home at 5 knowing the job has been done properly V trying yourself, the top breaking off and being left with no car.
Penetrating oil is useless, it doesn't reach to places it needs to, a lot of garages don't even bother trying themselves any more, they just get the expert in.
Ok, thanks for this, I always thought heat and expansion would help
It was a sly swipe at the fact that modern diesels are notoriously cool runners, I think you'd be unlucky to burn your hand on one biggrin

If I was to start the job from scratch with no knowledge I would have done as you suggested, only I would have taken it a step further and hit it with some freeze spray before acting quickly, I'm told it doesn't work though.

There are plenty of experts countrywide doing it now, this lot up North have an interesting home page (despite being about 3 miles long) http://www.injectorsremovals.co.uk/
Prices and the levels of desperation are evident and the last few pics are quite funny. laugh
You can see the makers name on the equipment, trace that to their website and Youtube too for more info.
Thanks for the info, I didn't know modern diesels ran so cool

That Website you posted a link to has 20 Mb of images on the front page and nearly burnt out my CPU

_bryan_

250 posts

179 months

Tuesday 13th December 2016
quotequote all
Only just seen this so sorry if it's too late. Best way to avoid snapping them is to undo with a torque wrench. If you search online the manufacturer of the glowplug actually state a snapping torque, stay below this and they shouldn't snap in theory. If the torque wrench clicks apply more heat/penetrating fluid and try again until it frees within the required torque.

Josho

748 posts

97 months

Saturday 17th December 2016
quotequote all
Drilled out many of these bds.

My advice is HOT engine and a T handle as opposed to a standard ratchet.

Always good fun when you drill the threads and fire the car/van up and wait for the BANG as the broken carbon end flies out.