Mike's limited experience, he's talking about type-1 engines. Type-4 can be put in after from outside the case. @mikedjames it would be better if you didn't guess answers to type-4 questions, they are very different beasts.
In my defence, I can't see you mentioned that anywhere and the only pic on the thread is a type-4 flywheel.
Supposed to put them back in order, but I doubt it matters. I've got a spare (new) set of tappet clips you can have for £5.50, if you PM me your address. Bargain ! Things to do while you're waiting: - post a pic of the centre main bearing shell in the half you've taken off - have a fondle of your tappets that fell out. Is the top slightly convex, or concave? - see if you can move the end bearing up by the flywheel back and forth You know you want to while you've got the chance .
Yea, I’ll just set the valve clearances again when I’m done- should be fine, there’s no play in any of them and the tops of them are perfect as are the cam lobes. When you say play in the crank bearing do you mean fore and aft or side to side? btw I’ll take your tappet clips- I’ll send you a pm, cheers
The only cure is complete strip down, case machined, new bearings. It would be worth your while to measure the width of you thrust bearing saddle and see if the repair is even possible as it can only be done twice before the case is junk. That's something that would be good to know in advance of either driving it happily to destruction, doing it soonish or somewhere between.
^this. Measure the (exact) width of the case web that supports the end bearing. Should be bang on 22/21/20mm. Lower than that, you won’t find replacement bearings after you’ve had the case machined (although there are other rather bodgy methods of fixing it). Or just slap it all back together again …
Sorry, wait, I thought you were on about the crankshaft moving- I did wonder why you would measure that without the shims and flywheel fitted. I’ve just had a look at the bearing at the flywheel end-there’s probably about 0.2 - 0.3mm play of the bearing in the case.
As if shouldn't move at all the case it wearing. Sadly the more it moves the faster it wears as it kind of gets a run up - think of it like swinging a hammer. Did you measure the saddle width/or the width of the bearing between it's flanges? You can do that near enough with a tape measure as it's going to be a whole number of mm. 22mm is good and unlikely. 20mm is bad as you can't get a 19mm one.
