Sigma engine - Locking the crank in order to remove the front pulley

[oldbutnotslow]

Where do you lock the crank on a Sigma engine in order to remove the front pulley?

The usual space used to lock the flywheel via the ring gear teeth on a K doesn't seen to be available on a Sigma engine

On production Fords there is a pin that you insert close to the N/S drive shaft that fits in a hole in the crank

I need to know if I am going to change a cam belt.

Is there a correct torque for re tightening or is it just FT?

Thanks

Grant

 

 

 

Edited by - oldbutnotslow on 22 Aug 2014 22:48:42

[Jonathan Kay]

Threads that might help:

1

2

3.

 

Jonathan

[DJ.]

I did this last winter, and it wasn't straight forward.

There is a timing pin which screws into the block near the front OS but this just stops the engine at tdc.

I bought a tool that fits the starter mount, but removing the starter is a pain.

 

Once the crank is locked, the cams are held with a plate through slots in the back, but you will find it doesn't fit the inlet cam slot as Caterham have retarded the timing. I took photos and reset it using the timing plate and by eye and my engine runs just the same. If you contact Caterham they just tell you to come in and they'll set it (for a price). Apparently you can't buy a Caterham tool to set the cam timing.

 

Email me if you have questions, I'm no expert but so far the engine runs well

 

By the way change the water pump at the same time.

 

Duncan

 

Edited by - DJ. on 23 Aug 2014 09:29:32

[SKC]

Hi Grant,

 

YHM.

 

Regards

 

SKC

[Stephen Long]

SKC Have a look at my comments on another cambelt change thread here on techtalk.

 

Longy 😬

 

Oh..edited to say oldbutnotslow see above.

 

 

Edited by - Stephen Long on 23 Aug 2014 19:43:55

[7 wonders of the world]

Clock the valve lift ATDC before you dismantle anything then you'll have the data for retiming it correctly.

[elie boone]

Or make your own marks at TDS before dismantling

[DJ.]

The problem is where to mark, as both the crank pully and can sprockets are just a friction fit on this engine.

[elie boone]

You can leave the flywheel lock in place at TDS and you don't need to remove the bolt on the cranck

[DJ.]

The lower timing belt cover needs to be removed to change the belt, and the pulley needs to come off to access it. I did wonder about leaving mine off but we have so many loose stones on the roads around here, I decided to play safe.

 

Duncan