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Engine component tolerance specs

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AshimotoK0:
Would have to check. Best thing is to post decent photo's and Measure camshaft lift (max height minus base circle) . Do rockers have 312 marked on them in the casting? Best to give us clearance between cam journals and cam cover bores.  K3 should have 312 rockers and skinny late 286 cam but sometimes they have been changed.  Main thing on cam is check for pitting & /or wear ridges on  lobes and scoring on journals plus check for bad scoring on cam cover bearing housings. Quite often it is plain obvious that these parts are toast before even measuring anything just by visual inspection.

Fenderfreak:
Hi Ash, yep rockers are 312 and have little or no wear.

Cam shaft lift is 6.54 and 6.58. The lobes and light scoring on the journals but appear more cosmetic than deep scoring  as can not feel with
fingernail

Measured both covers 3 times on x and y axis and used largest measurement when calculating clearance between journal nd cover bore ID.

L =0.43 R=0.48

The covers look to have been sleeved at some point, and are quite scored! One of the feed holes was blocked.

Looks like these will both have to be replaced 🙁

Will send hi res photos, cheers

Fenderfreak:
Forgot to add can the covers be fitted with roller bearing?

AshimotoK0:

--- Quote from: Fenderfreak on October 19, 2018, 04:24:47 PM ---Forgot to add can the covers be fitted with roller bearing?

--- End quote ---

Cover definitely been sleeved. You can fit roller bearings but it needs precise machining and bearings and sleeves are not cheap.... more for race CB350's than road bikes. Best to find originals ...they are out there if you search..... last nice used one I got from Frank at jap2wheelz on German eBay. I will PM with his email ...cheaper to go direct if he has any.

AshimotoK0:
https://www.ebay.de/itm/CB250K-B4-CB350-Nockenwelle-Lagerdeckel-rechts-RH-cylinder-head-cover-CL-68-73-2/163227176240?hash=item2601190d30:g:28oAAOSwO6tbhjm~#

He has the other side too but I would email direct and see if he is up for a deal on b0th. His email address is on the listing

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