Seized engine

[Bob_Roller]

I remember seeing in the BMW repair manual, dimensions for first, second and third oversize for pistons, rings and dimensions to re-work the pre-nikasil cylinders. Is this something still available from BMW? Or is it NLA ( No Longer Available)?

[tagordon]

James
Did you see the cylinders & pistons on ebay???
http://cgi.ebay.com/ebaymotors/Pistons-cylinders-bmw-r65-79-r80-r100_W0QQitemZ280130371830QQihZ018QQcategoryZ35606QQssPageNameZWDVWQQrdZ1QQcmdZViewItem

[Lowen]

James I ran into my friend Bruce yesterday and he has an R65 engine for sale.
http://www.ntnoa.org/bruce.htm

[xeffer]

I just had my pistons done - in my case it was the left side that was seized, and I wasnt as lucky with the WD40 etc... I had to literally break the piston out of the block, piece by piece... Anyway - even though I am in South Africa, I ordered my parts from USA since it was cheaper to get it from there, and the first question I was asked is: "Do I want over size pistons?" So I DO believe the over size pistons is still available. Hope you come right though - be it with over sized pistons, or another engine. My bike's been up and running for about a week now (after it had been standing for about a year), and I almost forgot how much I missed it!!!

Safe riding - keep your tires on the black stuff

[Bob_Roller]

I found the parts on the MaxBMW website, over size pistons are  $170 each for the pistons, and $45 for a set of rings for both pistons. Not a cheap fix, combine this with shop services to bore out the cylinders, and you are going to be in it for over $500.

[xeffer]

The "all in" figure of $500 sounds about right. My "all in" figure came to 3500 South African Rands, which is almost exactly $500. The prices mentioned for the parts also sounds right from what I can remember (remember that I mentioned I got the parts from the US). This was the cheaper option for me rather than buying the parts in SA. Had I bought it here, the "all in" figure would have been over R5000/$700

[Semper Gumby]

Whoa James not so fast.  What year is this engine?

If the piston was siezed then you can be sure the rings are stuck (probably even still after the piston is freed up.)  If it is a cast iron sleeve (1980) then put some new rings on it and put a hone on the cylinder liners.  You might find you get some of that comression back without having to replace an engine!!!  If you have Nikasil then put rings on and inspect the cylinders.  YOu may yet get lucky without having to spend a lot of money.

TTFN,