MRC Forum- brought to you by www.morini-riders-club.com Member: g7AW3f

Got the 3 1/2 pretty well back together - I would have been much nearer completion had I not made a schoolboy error.

Having re assembled the rear cylinder, I was just about to put the head on the front cylinder when I noticed I had fitted the pistons the wrong way around

Although I had marked bith pistons with a sharpie, and kept them away from each other I managed to pick up the front one and put it in the rear and vice verca.

Oh dear, or words to that effect...........

We are all guilty. Refilling oil whilst omitting to refit a drain plug, starting a BMW without refitting the dipstick, knocking a main bearing clean through the case etc.
At least you noticed in time.

Check you have the orientation of the pistons the right way round , the combustion Chambers in the piston crown must face the correct way, ther is a picture in the blue book , I should know I got that wrong , on my first engine build .

Oh yes - they are definatley the right way around as per 45 of the blue book

I even took the laptop out into the garage open at the page when I put the pistons in the second time !!!

P.S. Started it up this afternoon, nice that it has lots of compression now - just need some decent weather to put some miles on it / bed the rings in.