A question re cam bearing blocks and lubrication

B

biffom

Junior member
Guys,

A question regarding the cam bearing blocks on the triples.  In the service manual they are shown with an oil aperture in the center of the guide wall.  Mine (a76 jota) have no such oil apertures.  I?m wondering just how it gets enough oil when the only way in is to leach in through the end of the bearing.  Are they all like this or just some? I guess in this case that they shouldn't be too tight a fit with the cam.

Also the bolt holes in the bearing blocks are elliptical on the top but round on the bottom.  Is this by design or just down to wear?

I?m going to have to order a set of bearing blocks as the center exhaust block is binding when torqued up and upon closer inspection seems to have deformed slightly around the shoulders of the elliptical bolt holes.

Thanks,

Carl.

 

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Not sure if it helps, but Malcolm Cox has a set going on ebay.
Cheers Al

http://www.ebay.co.uk/itm/Genuine-Laverda-6-Cam-Blocks-/130569499777?pt=UK_Motorcycle_Parts&hash=item1e668c7481#ht_500wt_1156
 
If you going to change cam blocks, I suggest billet ones from Red. If you in UK I imagine Keith would have some.
There's nothing better.
 
there have been many changes to the oiling system over the years.This thread highlights one of them.Early cam bearing blocks (not this early so yours are from an earlier bike) did not have the oil feed holes drilled in them to squirt "bearing" oil straight at the cam lobes.There have been dozens of of other changes,probably starting with the earliest mod, which was a change of crankcase machining to include an O ring between the halves where the first ones had nothing, then two extra bolts on the crankcase front as well, others include changing the width of the gears internaly in the oil pump, as demand grew.The way the oil drains back to the sump has changed (especially in the primary case) two different types of oil cooler have been added, some models have a direct hole drilled into the pump outlet to squirt stright at the primary chain, finer strainer mesh between 180's and 120's, and loads more that i have forgotten.If you are fitting new cam bearings, then bite the bullet and buy a 10mm wide oil pump from almost any of the usual places.That would ensure that whatever you do you will have good oil circulation, but you must always check that this is the case visually. I use a cordless drill with a rubber nose on it, then with the drive gear on the crankshaft removed, you can spin the oil pump to your hearts content and watch it piddle out of those bearing blocks.
CLEM
 
I have new billet ones..actually from Slaters but am not sure where sourced...I know Andy wagner did them , but if in the Uk i would call Keith if I were you..btw , he spotted my cams were not true either so perhaps check those while you are at it..I think the collapsing of the blocks is a common theme over the years...have a look in A wagners catelogue for a useful illustration of the different types etc?
Nick7
 
Thanks for all the info. I've got an order in with Wolfgang. And I shall also look into upgrading the oil pump.

Having heard the older style blocks described as "old crumblies" - I thought bingo! that's exactly what I'm seeing with mine. 

Cheers,

Carl
 
biffom said:
Thanks for all the info. I've got an order in with Wolfgang. And I shall also look into upgrading the oil pump.

Having heard the older style blocks described as "old crumblies" - I thought bingo! that's exactly what I'm seeing with mine. 

Cheers,

Carl
Click to expand...

Surely you know that already but the new blocks have to be checked for alignment, quite rare that they are aligned without some work on the cylinder head (or shimming as a bad resort).
 
Ugh... On the alignment issue - naively I wasn't expecting an issue with a complete set of blocks.  Just did a search on the site and found a plethora of info on this subject (head warp etc...) Am going to have to wade through it all.  Thanks for the heads up.

Also noticed that my original question had been raised and answered before.  Honest guv I really did search the site before posing the question.... It's just that being a newbie I'm not up on the lingo.

Thanks for the patience,

Carl
 
Hi Carl, as everything regarding all things Laverda has been covered at least once, if we all used the search tool we wouldn't have any technical questions to post for a reply. :D
 
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