Managed to pull the rear head off my v6 cos I couldnt get 4 of the exhaust studs back in.
I managed to put studs in 3 of the holes I was having trouble with, but one is definitely cross threaded. Put a stud which went in abuot 3-4mm, but I noticed it was at about a 90° angle, and when I removed it I found tiny bits of swarf in the hole.
I've never had to sort out anything like this before, and I know I will have to get someone else to have a look at this, but as far as I can see, I have two options, to try and get the hole re-tapped, or to get it helicoiled.
I was thinking of trying a re-tap first, then if it totally goes pearshaped, then getting it helicoiled. Does this sound like the right approach? Can't find much info- search on helicoil only returned one thread!
Also I when I pulled the head off, each of the cylinders had a little brown liquid in them. Only thing I can think of is that that bank might have been running overfuelled because I ran it without the exhaust connected, and I pretty much removed the head the previous sunday, but couldnt quite get it off without an assistant, so only actually pulled it yesterday, so a bit of oil and water may have made its way in and made this nasty looking mixture.