Can someone confirm the torque setting for the crankshaft pulley bolt on a BBY 1.4 engine please. I have found two settings, 90nm +90° for a flat head bolt and 150nm +180° for a recessed head bolt. 

 

This is the old bolt I will be replacing;

 

 

I'm pretty sure I should be using the 150nm +180° torque setting but don't want to get it wrong obviously.

 

Thanks

The Haynes manual says 90Nm and 90 degrees. Doesn't seem to mention different bolt heads though.

Ah, here we are (150 Nm + torque a further 1/2 turn (180°) .....

 

https://workshop-manuals.com/skoda/fabia-mk1/power_unit/1.4/55;_59;_74_kw_mpi_engine/enginecrankshaft_group_pistons/disassembling_and_assembling_engine/procedure_for_tightening_the_screw_for_crankshaft_belt_pulley/

 

 

Edited 11 June, 20205 yr by TMB

It's bizarre, in my opinion. That seems to be such a huge difference. It's the same for the equivalent bolt on the 1.2 engines I think; really hoping I never need to try to do the job. Same bolt thread size and pitch as far as I recall.  Possibly different material grade, I forget.

 

Recently been taking driveshafts off and re-fitting on my Polo 9N3. Same driveshaft P/N, same P/N bolts  as a Fabia with the smaller engines (M8 x 48 XZN bolts). Fabia workshop manual calls for 20Nm + 180° turn (no sequence suggested IIRC); Polo w/s manual says pre-tighten each to 10Nm in opposites pattern then 40Nm, same pattern. Having tried both a few times on the respective cars, there's a huge difference in applied effort/torque. The 180° takes a decent effort on an 18" breaker bar, Christ knows what 150Nm plus 180° takes! I remember @Tech1e talking about some seriously big counterhold tools for the crank bolt.

 

This is all under the same company!

 

I'll have a looksee what Polo 9N3 manual says about the crankshaft pulley bolt.

Edited 11 June, 20205 yr by Wino

4 minutes ago, Wino said:

It's bizarre, in my opinion.

 

It does seem odd, Pete.

Polo info is at least consistent on the crank pulley bolt for BBY et al.; 150Nm plus 180° for the recessed head bolt like you had/have.

Counterhold tool is VW 3415, which does look substantial: https://www.ebay.co.uk/p/1845066239

Edited 11 June, 20205 yr by Wino

3 hours ago, TMB said:

Ah, here we are (150 Nm + torque a further 1/2 turn (180°) .....

 

https://workshop-manuals.com/skoda/fabia-mk1/power_unit/1.4/55;_59;_74_kw_mpi_engine/enginecrankshaft_group_pistons/disassembling_and_assembling_engine/procedure_for_tightening_the_screw_for_crankshaft_belt_pulley/

 

 

Thanks for that. It confirms what I thought.

Edited 11 June, 20205 yr by SimonJ

3 hours ago, TMB said:

The Haynes manual says 90Nm and 90 degrees. Doesn't seem to mention different bolt heads though.

 

Haynes manual for the Polo is the same too.

2 hours ago, Wino said:

Polo info is at least consistent on the crank pulley bolt for BBY et al.; 150Nm plus 180° for the recessed head bolt like you had/have.

Counterhold tool is VW 3415, which does look substantial: https://www.ebay.co.uk/p/1845066239

 

Thank you for confirming from another source. Already have that same counterhold tool. Hope my breaker bar is long enough!

Wino's counter holding tool is for the camshaft, not crankshaft.

No, that's what's specified for crankshaft, see Lee's link.

1 hour ago, Doily said:

Wino's counter holding tool is for the camshaft, not crankshaft.

 

The camshaft lock can be seen in the back ground of my picture in the first post. The crankshaft counter hold tool is what Wino's eBay link shows.

700mm long, according to the ebay listing. Tis a whopper.

Crankshaft bolt done without any problems using the above counter hold tool and 3/4" drive T-bar.

 

Thanks for the help with the torque settings.

Edited 12 June, 20205 yr by SimonJ

Tight is tight, too tight is frucked

On 11/06/2020 at 20:43, SimonJ said:

Can someone confirm the torque setting for the crankshaft pulley bolt on a BBY 1.4 engine please. I have found two settings, 90nm +90° for a flat head bolt and 150nm +180° for a recessed head bolt. 

 

This is the old bolt I will be replacing;

 

 

I'm pretty sure I should be using the 150nm +180° torque setting but don't want to get it wrong obviously.

 

Thanks

It is because newer bolt is 10.9 and older 8.8 strenght..

I did the cambelt on my 1.4/16V BBY engine Polo recently. 

Getting the old bolt out was nearly a showstopper. It was the recessed head type, changed by VW 10 years ago when they did belt and WP.

 

1 meter long 3/4" breaker bar on the bolt, that long counterhold tool being held by a biggish pal, and I was just bouncing up and down with no progress. 

Luckily another pal who'd experienced the same snag suggested heat (which of course lengthens the bolt and so reduces the tension in it).

Made all the difference without going mad on the temperature, since there are plastics nearby.

 

 

only impact gun helps.. blocking crankshaft and do it.

Tried a beast of a battery-powered gun, didn't move it!