810 engine assembly

Hey, finally got my case (top half) and block back from the machine shop.

I have the crankshaft, trans, secondary shaft and oil pump back in. i am wondering if i need to use any liquid sealant on the 2 black rubber crankshaft seals???

also should i use threadlock on the bearing stopper plate b-4 i stake them in? where else should i use threadlock? liquid gasket?

she is a 78 560

thank yous guys

if the seals are brand new then don't use any sealent on them put a bit of oil on the inner sealing surface and you should be good to go if they are used get some three bond 1104 for the outside and for your case halfs it is the best stuff for puting cases together it dosen't ooze out like silicon does as far as using thread lockers i us them on any crucial fasteners that will see alotr of rpm of stresses like cam sprocket bolts or counter shaft sprockets.

Am in complete agreement w/ TB. would add, just a light skim of sealer is best.try to assemble whilst still tacky. most japanese motors incorperate oil restrictors to control oil pressure in differnt areas, these restrictors have holes in the same range as carb jets. and excess goo /debris can easily clog them. cleanliness is imperative. Luck g

thanks guys.
the seals are used, i'll use the 3bond i got from jeff. the pressure restrictors are the dowels correct??

I got the cyls and case back and the dowels were out (in a bag)... i didnt take them out (i forgot to) so i dont know where each one goes. there are 5 in the bag some or the jetlike ones and some that are just straight up hollow (large hole, not jet-like) can you help me fint their homes?
thank you.

You'll have 4 restrictors, two round ones at the cylinder base and two rectangular between the block and the head, all with an o-ring around them. Orientation matters, they should sit with the small holes pointing up like in the pics below.

Btw, why not get new crank seals while you have the cases split, they're not that costly.

Restrictors at cylinder base, one on each side:

And between block and head, also one on each side:

thank you, good pics.

for some reason i have 3 round restrictors and 2 dowels (the locating dowels i assume) so the 2 restrictors in the pictures are good, where do i put the 3rd? and the locating dowel. this clymer is a good firestarter...thats about it. i should get new crankshaft seals, youre right. any tricks to replacing them?

The crankshaft bearings....... do i need to replace them all if i replace one, can i just replace one, or do i need to do a pair. i got a new one to replace the buggered one (scratched when it was out) thinking the crankshaft doesnt make much contact, if any with the bearing. i was told that they wear as a set, but isnt there always oil in there after start up? so how are they going to wear?

P.S. have you ever just made one single parts order when you do a rebuild????? hehehe

thanks for all the help!

The locating dowels go over the two front outer cylinder studs between the block and the head - fig. 65/pg. 75 if you have the same Clymer as I do, you can also see one dowel in the second pic I posted above.

That third round restrictor has me stumped - I just assembled a 79 650 D engine this winter and only had the two round and the two rectangular ones (you do have those too, right?). Btw, note that for some reason the Clymer doesn't mention the rectangular ones at all, just the o-rings.

I've had 650 motors apart and OnkelB is right, only 4 restricters, 2 round 2 oval. Someone else must be short one.
Mark

ok, great help, thank you.

the third one must be from the 750 block, and the other 2 are from my 650 case.

thank you

so the 2 locating dowels i have wont fit over the cyl studs, theyre to small. do these go between the 2 crankcase halves? and where? front and back center? do they get o-rings? sorry for the stupid questions, i didnt take them out (the machine shop did).

thank you.

Yes, if they're too small for the studs they go between the case halves here: