All Things Mk5 > How to Guides / Troubleshooting

Inlet cam swap

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g0rdo32:
I'm in the midst of changing out my inlet cam due to a cam followe failure. Lobe was very worn and hpfp is shot.

Just completed swapping the cam out and got a new chain and adjuster on. As I turned on the engine over by hand it stopped and I was unable to move it further. I'd moved it about 1/3 a turn on the cam from the marks on the chain. Obviously worried something might be out now.

I marked up the old chain and transferred the marks to the new one. Same for the cam teeth. I also used a cam locking tool which I check again before trying to turn over.

Not sure whether to carry on reassembly or stop? Any thoughts?

pudding:
I would start from scratch with the timing to out-rule piston to valve contact.  If the engine turns freely in either direction until it hits a hard stop, it does sound like parts colliding.

The chain isn't long enough to bunch up and bind if you turned the engine anti-clockwise, so probably isn't that.

g0rdo32:
Thanks for the advice @Pudding . Managed to get it turning over smoothly by hand after a bit of persuasion.

Got it back together again and started today. Idle was very lumpy and had a tappet sound similar to when the follower had gone. sh*t it off quickly when I heard that. As I said, timing tool was used and confirmed before reassembly.

The thought of another strip down is not very appealing but might be the only option?

g0rdo32:
More investigation last night and I found cracks in the breather pipe to the PCV so got replacements on order. Hope this will sort the idle issue.

Not sure about the tappet noise though?

Octoparrot:
Sorry but I think you've bent a valve.

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