Honda CB750 Sandcast

The Restoration Shop => Engine Mechanical => Topic started by: markb on December 18, 2011, 04:27:19 pm

Title: Oil Gallery Plug Under Transmission Cover?
Post by: markb on December 18, 2011, 04:27:19 pm

There's an interesting discussion going on at the SOHC4 site regarding this topic.  Take a look at the hole (circled in red) and tell me if you ever saw a plug for this hole.
(http://cb750sandcastonly.com/coppermine/albums/userpics/10002/DSC07675~0.JPG)
Here's a link to the thread:
http://forums.sohc4.net/index.php?topic=99721.0 (http://forums.sohc4.net/index.php?topic=99721.0)
It has me really curious.

Title: Re: Oil Gallery Plug Under Transmission Cover?
Post by: hondasan on December 18, 2011, 05:29:46 pm

Sandcast bikes rely on the gasket to seal off the end of that oil gallery. "Later" bikes use a rubber plug which has a lip that sits in a small shallow counterbore at the end of the gallery to seal off the gallery. I have never come accross any reference to this plug in the parts lists, and have no idea when it was first fitted.

Chris R.