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FAQs

Because they seize. A plug that comes out cleanly needs only a socket; these tools exist for the ones that break off or take the thread with them.

With a damaged glow plug removal set, held at 8mm and 10mm, which extracts the remains from a hole that still has to be usable afterwards.

A 33 piece glow plug thread repair set cuts and lines a new thread in the head, which saves a cylinder head that would otherwise have to come off for machining.

A dedicated socket rather than a standard one, since the plug body is thin walled and the electrical terminal sits proud. A 3 piece set covers the common sizes.

Yes, with the right adaptor. Kits are listed by marque, covering BMW, Mercedes, Rover and VAG on one and Ford, Mazda and PSA on another.

A diesel compression gauge with hose and TDC bracket, which sets the reading against top dead centre rather than taking a figure in isolation.

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Glow Plug Tools

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A glow plug that comes out cleanly needs only a socket. The tools on this leaf exist for the ones that do not, and that is a far more common outcome on an engine where the plugs have been in for years and the threads have seized. Assuming the plug will unscrew and finding it will not is what makes this leaf worth knowing about in advance.

Removal of a damaged plug is a different operation from unscrewing one. A removal set at 8mm and 10mm extracts the remains of a plug that has broken off, working in a hole that still has to be usable afterwards. A plug that shears leaves the tip in the bore as well as the thread damaged, which is two problems rather than one.

Thread repair follows when the removal takes the thread with it. A 33 piece set cuts and lines a new thread in the head, which is what saves a cylinder head that would otherwise have to come off and go to a machine shop. Removal and repair are often needed together, since the thread rarely survives a plug that has broken.

The plug hole is also the access point for diesel compression testing, and the adaptor has to match the thread. Kits are listed by marque: BMW, Mercedes, Rover and VAG on one, Ford, Mazda and PSA on another. Send the engine to 07754288583 on WhatsApp. Reading the marque on the adaptor kit before ordering avoids a thread that will not seal against the gauge.

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FAQs

Because they seize. A plug that comes out cleanly needs only a socket; these tools exist for the ones that break off or take the thread with them.

With a damaged glow plug removal set, held at 8mm and 10mm, which extracts the remains from a hole that still has to be usable afterwards.

A 33 piece glow plug thread repair set cuts and lines a new thread in the head, which saves a cylinder head that would otherwise have to come off for machining.

A dedicated socket rather than a standard one, since the plug body is thin walled and the electrical terminal sits proud. A 3 piece set covers the common sizes.

Yes, with the right adaptor. Kits are listed by marque, covering BMW, Mercedes, Rover and VAG on one and Ford, Mazda and PSA on another.

A diesel compression gauge with hose and TDC bracket, which sets the reading against top dead centre rather than taking a figure in isolation.

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