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Straight forward but fussy (archive)

[ Follow Ups ] [ 5-series (E34) Message Board ] [ Msg. Board FAQ ]

Posted by Earl Badger on November 02, 1999 at 10:48:36:

In Reply to: Rings!!! posted by Andy on November 02, 1999 at 02:28:29:

I'm not sure about the small six but on the big six it is fairly straight forward. Take off the head and the oil pan, undo the rod caps and push the piston up. If you need a ridge breaker to remove the ridge at the top of the bore your cylinders are too worn you will probably have to bore out the motor and use oversize pistons ie complete rebuild. Once the pistons are out you need a internal micrometer to measure the cylinder bore, out-of-round and taper. If it is out of spec you will be wasting your time and money trying to re-ring it. You will need a cylinder hone (fits in an electric drill) to break the glaze in the bores otherwise the rings will not seat. You'll need a ring compressor to get the pistons back in. A nice to have is a ring groove cleaner but if you are careful you can use a peice of your old ring to scrape out the gunge. You may want to consider new pistons as they come with rings and a new wrist pin. Try to get cast rings not chromed ones as they may not break into the worn bore. Before you re-assemble the rod caps use some plasti gauge to estimate the size of rod bearings you will need. Most of these tools can be borrowed from a good parts supplier. If you consider that you only have to do this once every few hundred thousand miles you may want to pay a mechanic to do it (or find some old guy who will help you) and save yourself the learning curve..lots of little things to look out for and mistakes can be costly.


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