500 engine strip

[florence]

ok

[matthewmosse]

As a wild card option Bemw in Derby do all sorts of clever metalwork and engineering, or did when I last visited. Hopefully you'll find a source for the good one you need but at some point and probably soon it may prove to be the case that reclaiming a worn one is going to be the way to go. Posting a picture might well help identify the required part - slim though it may be, there is a chance I have a spare that is getable at - I have 3 plastic crates of 500 and 550 bits in addition to the engines and whilst I've no room or time to strip an engine, rummaging through a box might prove do able.

[mickwinf]

I have located one from the USA, will post a picture of old one when I have time to take it out of the crankcase.

[Bryanj]

Get a small round magnet on a stick (mine is Snap -On) to get the pins out which run in the drum grooves and also note which way out the "R" clips go as many an unhappy hour has been spent try to remember and find the one that pinged across the workshop!!

[mickwinf]

cheers Bryan I will be careful

[mickwinf]

this is the old selector fork, you can see it has worn badly

[mickwinf]

another pic

[mickwinf]

Ken the tip on one side has worn a groove about 1mm deep, you can just see it on the pic, it has the number 51 stamped in it.

[mickwinf]

I had a look at the sliding dog and it looked good, in fact the whole bottom end looked good apart from this one item, so will put it back together with new primary and cam chain and hope for the best!

[Bryanj]

For some reason it's always that selector that shows wear and nearly always the same pattern.
If i sat and thought about it perhaps i could think of a good reason but can't really get steamed up about it.

over the years I have seen most of the gears damaged in some way but not one more than any other, as long as you strip and repair before they jump out regularly i think just the selector will cure any problem

[mickwinf]

well I received my selectors from the US, I actually ordered 350 k items as the one I wanted is the same. It turned out to be in good condition, although another one in the set looked quite worn, so was lucky. I have now rebuilt the bottom end with new chains etc, and tonight have refitted to the frame while still partly stripped as I cant lift a full engine on my own. Glad to be making progress!

[Trigger]

Nice mick. Is the engine paint or vapor blast. Spotted a whole gear box on ebay uk last night.

[mickwinf]

Trig I had to clean the engine the old fashioned way with gunk and toothbrush then wire brush and dremmel, then sprayed with silver smoothrite. Head and barrels will be hi temp silver.

[mickwinf]

Now ready to install oil pump, and I have read somewhere it should be primed before use, how is this done?

[Bryanj]

Never had to do one yet but you can fill them with vaseline