harmonic balencer bolt

[vc commodore]

3/4 is close to 19MM....As you mentioned 19MM is a bit sloppy, which then puts it as an 18MM....

Personally, the last one I did was in a VY and I disconnected the fuel pump relay....Had a breaker bar resting just above the chassis rail, with some foam inbetween the chassis rail and breaker bar and quick turn overs of the starter via the igintion....I think it took 2 or 3 hits of the key to loosen the bolt....

 

[Skylarking]

The crank bolt seems like a critical part, as I understand, so why wouldn’t you just get a new bolt from Holden spares? Having one in your hand makes getting a matching socket so much easier

And as a critical engine part, getting the tightening torque correct requires the crank to be locked in place which, as you plan, is best done via an appropriate tool. Such crank locking tools can lock the flywheel or lock balancer inner hub (as used by some manufacturers/designs) The later designs can be easier to use as they don’t require starter motor removal

 

[gungazza]

18 mm to small, got a 19mm 8 sided socket, , which fits a little better, bolt must be 18.5 mm where whoud I get one of them mec at work says thay don't excist I nthink I have some witworth sockets I thin might have a look at them

 

[Trevor loves holden.]

18 mm to small, got a 19mm 8 sided socket, , which fits a little better, bolt must be 18.5 mm where whoud I get one of them mec at work says thay don't excist I nthink I have some witworth sockets I thin might have a look at them

 

[greenacc]

I would try that 6 sided socket as long as it isn't a 50cent job like a spark plug socket.

 

[Trevor loves holden.]

47/64 will be the closest if you can get one.

 

[gungazza]

some body must know the right size

 

[gungazza]

where would I get one of those trev

 

[greenacc]

I had a look at mine today. It's a VE but the same bolt no doubt. The 19mm 6 point socket is perfect. It rattles a little bit but that's just how it is. The head of the bolt is not precision machined, it looks like it's been forged so it's a little bit sloppy. The best thing about those 6 point sockets is they grip on the flat sides of the bolt not the corners like a 12 point. So being a tiny bit loose won't be a problem, it won't round off the corners of the bolt. That's why Black impact sockets are almost always 6 point.

 

[greenacc]

where would I get one of those trev

You don't want to know!
Those one size fits all type tools turn out to be useless most of the time. Save that for last resort emergency use only, and brace yourself for when it slips and you go flying across the driveway or crack your knuckles on the radiator