Hi

 

Today I decided to replace timing chain in my 1.4MPI, and everything went smooth until I had to unscrew the camshaft sprocket bolt - it was so stuck that I damaged the torx head of the bolt and now there is no way to unscrew it :( Maybe someone has any idea how to remove this bolt? There is not much space between the bolt and the frame, about 5cm.

Edited 8 July, 201510 yr by dstojek

Hmmm, that's a real bugger. Did you use the right size torx bit?

 

Only thing I can think of is to cut through the small cog with an angle grinder and get another cog and bolt. Not sure if there's enough room though? Also, bits of metal grindings will probably get into the engine

Have a big nut MIG welded onto it and remove with a big spanner.

Hmmm, that's a real bugger. Did you use the right size torx bit?

 

Only thing I can think of is to cut through the small cog with an angle grinder and get another cog and bolt. Not sure if there's enough room though? Also, bits of metal grindings will probably get into the engine

I used T45 torx bit, T50 was too big. I was thinking of cutting the bolt with dremel but there's not enough room unfortunately.

 

Have a big nut MIG welded onto it and remove with a big spanner.

That will probably be the best solution but I don't have neither MIG welding machine nor experience to use it. Do you think that using basic 230V stick welding machine would be sufficient? Maybe I would have a torx bit welded to the bolt, but would it be possible to do it without lowering the engine?

I used T45 torx bit, T50 was too big. I was thinking of cutting the bolt with dremel but there's not enough room unfortunately.

 

That will probably be the best solution but I don't have neither MIG welding machine nor experience to use it. Do you think that using basic 230V stick welding machine would be sufficient? Maybe I would have a torx bit welded to the bolt, but would it be possible to do it without lowering the engine?

 

Clean it up and put it back together so you can drive it, order a new bolt from a Skoda dealer, when the new bolt arrives drive the car to someone with a MIG, have a big nut welded on and remove the old bolt, replace with the new bolt and drive it back home to finish the job properly. This is the only way to do it without removing the engine, you're in a world of hurt otherwise.

The part number for the bolt is 047109281

One point. Is it actually a torx and not a multi spline bit?

Here it is: http://www.skoda-dily.cz/data/items/92/52fcb2137144b.jpg . I am 99.9% sure it is torx

 

Thank's everyone for your help! Much appreciated! I will probably have to do it as Sepulchrave said. 

The nut is number 23 on here http://workshop-manuals.com/skoda/fabia-mk1/drive_unit/1.0/37;_1.4/44;_1.4/50_kw_mpi_engine/enginecrankshaft_group_pistons/disassembling_and_assembling_cylinder_block_and_crankshaft/summary_of_components/1.4_ltr._engine/

 

It says they are fitted with locking compund (Loctite 648), so that probably explains why it was so tight. Tightening torque is 25Nm.

Loctite 648 appears to be a high strength compound, so yeah it explains it. I should have warmed the bolt up with soldering iron or something...