| Author | Message | ||
     Rhun |
I want to put the newer high speed oil pump gear in my 2004 XB12R track bike. From the manual it states that it is behind the pinion gear. In the section of the manual that relates to this it also assumes you are accessing the crankcase side to split the cases or replace cams, etc.. My question is: since all I want to do is remove the pinion gear do I have to 'unload' the valve train before I can remove the crankcase cover, or just have all of the valves in the closed position by rotating the crank? Thus I can just remove the cover, pull the pinion gear and replace the oil pump gear without removing the push rods or heads? | ||
| Reepicheep |
Not according to the manual. The concern is that you will have a lot of pressure on a pushrod that is transferred to a cam that is only supported on one side (since the cover is removed). The worry is that you will hurt a cam or cam bushing. | ||
| Ceejay |
Some say that if you get the pistons and thus the crank in the proper spot, where all valves are fully closed you can just pull the cam cover, pinion gear and OPDG and then replace. I think it would be tough to get in the right spot and finding that may require a specific plate on the end of the cranshaft that tells what degree from zero the crank is in. You don't have to pull the heads, just the upper rocker box, which is easy on a tuber, might be tougher on an XB due to frame clearance. This allows you to loosen all the bolts holding the rocker arms down(the lower rocker cover too) and thus relieving the pressure on the pushrods. Then you can go about your business, and when tightening the lower rocker box down again go slowly... | ||
| Yohinan |
As ceejay mentioned there is a way to do it without pulling the pressure off the valvetrain. Would this make it quicker to get the job done? Yup. I have yet to find someone that can explain EXACTLY how to do this but supposedly it can be done. When ever I pull the cam cover off I just pull the pressure off the valve train. It does sound like a PITA however, after the first time you do it things go extremely quickly. It really is not that complicated. Time consuming the first time you do it? Yup. Just dont try and do it the quick way and you will be fine. | ||
| Rick_a |
Yeah, just put in on TDCC...and make sure NOTHING MOVES or you'll be in for a treat. I've done it once, and don't think it's worth it. |
