Rocker End Float

[Rusty Bolts]

Good point re getting it all square. I can imagine it being quite a long way out by the time you get to the end of the stud. Regarding the thread repair, CWs use Timeserts rather than helicoils. They repaired a stripped brake disc mounting hole using them on an old pair of wheels. Helicoils are more commonly available but I think that Timeserts provide a better repair.

 

[Bungy]

All done. I followed Mikeyboy's advice for the end float of between 0.15 & 0.1mm. It's a tight 0.15mm but an easy 0.1mm.
I can see the 90 degrees, followed by a further 90 would be appropriate for tightening the cylinder head back on, so thanks for the clarification Matt
The RH cylinder head nut was very loose so I'm not sure what that is all about
Engine does sound quieter

What kind of engine noise were you getting with this needing doing? Was it a ticking as though valve clearances at idle or was it a sound under load?

 

[Mistacat]

The BMW ones are an extra long helicoil with compromised thread near the bottom for retention.
Never had a problem installing them straight without a jig.
Getting hold of them is the only hard part.
Time serts are steel and as they are solid expand at a different rate to the ally and can come loose.
I am not so keen on them in engines.

 

[Rusty Bolts]

What kind of engine noise were you getting with this needing doing? Was it a ticking as though valve clearances at idle or was it a sound under load?

Nothing particular. It's hard to explain but at tickover it sounds less rattley. Once you are on the go you can't hear anything different. I think it's also a bit smoother at idle as well but I could be imagining that.

 

[Rusty Bolts]

The BMW ones are an extra long helicoil with compromised thread near the bottom for retention.
Never had a problem installing them straight without a jig.
Getting hold of them is the only hard part.
Time serts are steel and as they are solid expand at a different rate to the ally and can come loose.
I am not so keen on them in engines.

Good point. It's not something I had considered.

 

[JimVonBaden]

The may have to use a jig to be sure the drill and tap go in straight so probably not a DIY job even if you can wield spanners.

Off the shelf Helicoils, and an easy fix. You are barely drilling the remaining threads, so keeping it square is a snap. Ive done a few, always freehand, and never an issue.

Jim