15 The right side of the case was then taken over to the press so that the old right-side main bearing could be pressed out.
16 With the right-side main bearing out of the case, Kevin cleaned the case half and then checked the new 585 cams for clearance. One of the camshafts was placed inside the camshft bearing and Kevin rotated the camshaft to see if it would hit the inside of the case. As you can see, there was minimal clearance between the camshaft lobe and the lip of the case where the main bearing resides (arrow). There was also minimal clearance at the top of the cam’s rotation on the underside of the tappet housing. These areas needed to be addressed before moving further.
17 This Twin Cam Relief Tool from Zippers will precisely clearance the inside of the cam chest for the larger cams. The tool features cutter diameter and depth adjustment for precise control of material removal. The cam bearing supports the bottom of the spindle, the cutting bit is the blue piece against the main bearing housing. Kevin made sure to tape up any exposed areas and holes to keep bits of metal from entering the engine once reassembled.
18 After measuring the cams and adjusting the relief tool in accordance with the cam and the amount of material to be removed, Kevin bolted the support plate to the case and attached a drill to the cutting tool. He then slowly let the drill rev as he gradually fed the cutting tool into the case.
19 Here you can see the tool spinning around and gradually removing bits of metal from the case.
20 After a few minutes, Kevin removed the cutting tool and checked the cam clearance. As you can see, there is now much more room between the top of the lobe and lip of the main bearing housing (arrow).
21 The process was repeated for the other cam as well. The tool provides a very clean and precise cut.
22 Here’s a look at the underside of the tappet housing where the tool clearanced the case as well. At this point Kevin thoroughly cleaned and dried the case. We will leave off here. Be sure to check back next issue as we continue to follow the build-up of Oscar’s engine.
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