Need help with boxer motor - Page 2

 


[ Piston rings ? Why ? Or did you mean O-rings ?

Against all advice I tried not doing that, once on a BMW and once on a VW.
In both cases the rings never reseated right and I ended up doing the job
over.  Ditto a H-D a dealer did replacing base gaskets.  Naturally ymmv but
I always avoided pulling the jugs off the pistons thereafter.  One can pull
them off just enough to get the gudgeon pin out without disturbing the rings
if replacing base gaskets.

 


Come to think of it, I'll normally pull the cylinder with the piston
still in it, though I'm pretty sure I've removed them too without
seating problems.

IIRC, the normal ring seating advice on the BMW lists is
"Ride it like you stole it".

 

| IIRC, the normal ring seating advice on the BMW lists is
| "Ride it like you stole it".
|
Yes.  A BMW wrench told me the drill for new bikes who's owners could not
seat the rings in 20,000 miles was to wash the pistons and bores in soap and
water, wet a finger in oil and rub each piston skirt, otherwise assemble dry
then start motor and immediately run it at 4000 rpm for about a minute.
Never tried it myself .....

 


I've hear all kinds of scary procedures. Last time I
did the rings, I started with a 10/40 oil for the first
couple hundred miles, followed by dino 20/50, followed
by synthetic one or two changes later.

Going back the the Dnepr though, I found some good
photos:

http://www.advrider.com/forums/showthread.php?t=447932&page=4

Looks like there's a cylinder base gasket to worry about.
Not sure how the oil feeds in and out of the heads, so there
could be O-rings in there too.

 


http://www.advrider.com/forums/showthread.php?t=447932

Found ya some more photos.

On advrider, you probably want to search for more
of this guys posts. He's got one seriously abused
engine that he's rebuilding.