All Things Mk5 > How to Guides / Troubleshooting

Inlet cam swap

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g0rdo32:
Hi @Octoparrot all the cylinders were tested before I stripped down and had good test. Might be worth testing again to confirm.

I've not had to apply any excessive force to turn the engine by hand. Was slightly stiff to turn initially but it had sat for a while and a drop of oil in the park plug holes seemed to loosen everything up and turn freely.

pudding:
Tested before the strip down but the engine bound up when you turned it after fitting the cam?

It could still be a bent valve(s).  I know it's a complete ball ache, but you could remove the intake manifold and fill each intake port with petrol at TDC, one at a time, and see if it drips through.  I don't know what petrol's evaporation rate is in open air (which could give a false result if it evaporates quickly) but I can't think of another chemical that wouldn't cause damage if it does drip through into the cylinders?  Even the fluid level doesn't change after an hour or so, you can assume the valves are gas tight.

The only other things I can think of for the noises and rough running are still timing that's off, or maybe swarf from the failed cam/follower has clogged up the VVT adjuster or oil ways to the cams.   Do you have VCDS?  You can monitor the VVT's position with the engine running using that, which would outrule that issue.

g0rdo32:
Did a dry compression test and showed 175psi on the first 3 cylinders. Number 4 was 150 psi.

It's not looking good. I'm in two minds whether to investigate further or get rid of it now.

The thought of taking the intake manifold or taking off the head doesn't set world on fire.

pudding:
Not too horrendous.  Factory spec is 14 bar, or 203 psi.  No.4 is the problem child though.  A leak down test would determine if the loss of compression is at the top or bottom of the engine.  If the bottom end, yeah, £££s to do properly.

I find several beers and bassy tunes on my noise cancelling headphones helps with the monotony of stripping sh1t down.

JWatsonGTI:
@Pudding how do you do a leak down test ? im in the same situation as above.

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