Thread Repair Services
Pear Tree Engineering


Removal of

Broken bolts and studs

Glow plugs and Injectors



Repair damaged internal threads

Mobile service available

Sale of repair kits and inserts

  Home   Damaged Threads  

Broken Studs Drills,
Taps and Extractors


Glow Plugs and Injectors

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Removal of broken glow plugs in situ,
without removing the cylinder head.

We specialise in the removal of broken glow plugs which can be done in situ
without the expense of removing the head, at your premises or ours.

When a diesel engine fails, it often results from bad glow plugs. Similar to gasoline engine spark plugs, glow plugs assist diesel engine cylinders in the combustion process. Rather than using an electrical spark, glow plugs have heating elements that gradually heat up and help drive the cylinders. These heating elements are quite delicate, so knowing how to use special glow plug extraction tools plays a crucial role in successful glow plug removal.

The aluminium head diesels are notorious for seizing glow plugs. Apparently the plugs don't seat properly at the combustion chamber end.
This allows carbon to get packed in around the barrel. Over time the plugs become glued into place.
The narrow neck between the hex nut and the threaded shaft isn't up to the task of undoing the plug and it snaps.

Glow Plug Tip Removal

 We can now removing broken glow plug electrode tips stuck in the cylinder head
 without removing the head with very high success rates.

 our on site mobile service to remove broken heater or glow plugs

Seized Injectors

The removal of seized  injectors in the cylinder head problem is becoming  increasingly common and potentially a very expensive problem to rectify.
 Our technicians are equipped with the best and largest range of the latest Hydraulic Extraction tools  including the leading Pichler hydraulic injector puller tool with pulling capabilities up to 20 tons, meaning that our injector removal success rate is near perfect.

We can remove the majority of injectors and have all of the necessary tooling to provide a cost effective repair.
We are even able to remove injectors that have been damaged; for instance if the threads have been damaged or broken off, even if the injector has snapped leaving parts stuck in the cylinder head. 

 We can remove:

  • Seized Injectors.
  • Broken or Snapped Injectors.
  • Injectors that have been welded onto.
  • Damaged and manipulated injectors.
  • Bosch, Siemens, Delphi and Denso fuel injectors.


Diesel Injector Removal

We can also remove:

  • Broken and seized injector clamp bolts, rethread/helicoil.
  • Snapped, broken and seized glow-plugs.
  • Replace cylinder head injector sleeves on 1.6 DV6 HDI engines.


        Broken Injector Clamp Bolts

Injector clam bolts can be seized in or snapped,  we can drill out broken or seized injector clamp bolts and re-thread
 or install  inserts at the same time or on a separate occasion

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