Had half an hour today to start pulling down the BP, found some nice exhaust valve lean out on cylinder 2:
[img]http://images.plebeians.net/i.php?/upload/2018/08/11/20180811013940-9bc456dc-xl.jpg[/img]
Pistons look reasonable though, but quite wet.
[img]http://images.plebeians.net/i.php?/upload/2018/08/11/20180811013932-faee0aa4-xl.jpg[/img]
[img]http://images.plebeians.net/i.php?/upload/2018/08/11/20180811013926-3b858988-xl.jpg[/img]
Suspect its been running lean on a couple of cylinders there.
Had a bit more time today to have a better look (and drain the oil out of the engine…)
Got it up on the stand, and started stripping stuff. Looked all fine from above, and the pistons came out easily:
[img]http://images.plebeians.net/_data/i/upload/2018/08/12/20180812002540-9979c094-xl.jpg[/img]
That number 4 piston that looks rather wet above seemed to indicate that it might have been the cause for the blowby when the lower compression ring popped out in two pieces when i pulled it from the engine:
[img]http://images.plebeians.net/_data/i/upload/2018/08/12/20180812002521-e3b6835b-xl.jpg[/img]
But hm, what is that crack i see there on the skirt, i wonder how far that goes:
[img]http://images.plebeians.net/_data/i/upload/2018/08/12/20180812002502-5e50fed7-xl.jpg[/img]
That doesn’t look good, but surely it cant go all the way through, the guy said he had driven 50km home on low boost with just a plume of blue smoke. Time to take the rings off:
[img]http://images.plebeians.net/_data/i/upload/2018/08/12/20180812002429-10e8bafb-xl.jpg[/img]
Nup… thats borked.
Cracked through right on the top compression ring groove, and was being held together by the oil wiper ring.
[img]http://images.plebeians.net/_data/i/upload/2018/08/12/20180812002449-2ed4dfae-xl.jpg[/img]
Surprisingly no scoring or visible marking on the cylinder bore 😮
Will drop it off later at the local engine mob and see whether its out of round.