Splitting Villiers Crank

[Wessex100]

Good Day,

Just starting a Villiers 6e 197cc rebuild.

I haven't done bottom end on a Villiers before. Can anyone throw some light on separating crank? Will I need the services of an engine specialist?

Will probably have more questions as the project advances.

 

Thanks in advance.

[teamferret]

It is possible to get them apart, but they are tight - you won't do it in a vice. I've used a hydraulic puller to push the big end out, seemed to work fine. Re-assembly is not too bad but lining up the crank wheels to get everything running true can be trying. Obviously Villiers Services will do this for you and before Covid-19 you could take it to them and wait for it to be done. 

[phiggs]

I have only ever taken a BSA C15 crank apart, to install a new bearing.   I entrusted the work to a local heavy engineering company.  I got the flywheels back, installed them in the crankcases, and they were as stiff as ever.   Took it all apart again and had the engineering company re-true them, as they said they were 5 thou out.   They need to be way under 1/2 thou, only possible with precision measurements.

.

[suzuki250]

You need a press, some centres and a lead mallet to true it up 

I use a 6 tonne press,  it does the job ok but does struggle on more modern cranks

Edited May 27, 2020 by suzuki250

[section swept]

If you have access to a hydraulic press rated at 10 tons you might be able to press out the crank pin, but it may need a press rated higher. I use a 40 ton press and it can struggle on some cranks, there are some so people that have wrecked their presses before now. Then you will need a surface table and vee blocks along with at least two dti’s and stands. As teamferret suggests, use Villiers services as they know these cranks well. Unless modified your crank will be of the bob-weight type and not full circle. 

[Wessex100]

Thanks to all reply. Have been in touch with Villiers Services. I think I, ll leave it to them. 

[section swept]

1 hour ago, Wessex100 said:

Thanks to all reply. Have been in touch with Villiers Services. I think I, ll leave it to them. 

Good decision?

[thai-ty]

On 5/28/2020 at 1:24 AM, phiggs said:

I have only ever taken a BSA C15 crank apart, to install a new bearing.   I entrusted the work to a local heavy engineering company.  I got the flywheels back, installed them in the crankcases, and they were as stiff as ever.   Took it all apart again and had the engineering company re-true them, as they said they were 5 thou out.   They need to be way under 1/2 thou, only possible with precision measurements.

.

 

On 5/28/2020 at 1:24 AM, phiggs said:

way under 1/2 thou,

Really?

If you've got everything to within half a thou i reckon you've done pretty well, deserve a pat on the back, and the beers on me down the pub.

A thou is perfectly acceptable, obviously half a thou is better, way under - nigh on impossible.