Re: 1940 Super 8 160 Model 1803 Project

Posted by Jim On 2011/5/12 3:20:08

A very, very long night. Last night I gently attempted to extract the hydraulic lifter body from the tappet. No luck. I was not surprised because I was pretty sure the issue was a stuck valve at some point creating hydraulic lock and ballooning the hydraulic body into the tappet body. This would explain the lifter loosing enough oil between the lifter plunger and lifter body and never successfully pumping up. The problem is when this condition occurs the tappet is normally damaged and broken while attempting to extract the hydraulic lifter body.

The night started with a quick sketch and measurements to facilitate a tappet clamping fixture. This fixture will allow the tappet to be held tight and not spin or move up or down. Roughed a piece of scrap aluminum with the band saw. Used an end mill to rough the hole to .710" and then used to boring head to get precisely the same size as the OD of the tappet .718". Once that was done, the holding fixture had to be slotted, cross drilled, and tapped to 5/16 - 18 to facilitate a pinch bolt.

The tool took a few hours total but turned out fairly nice considering it was something dreamed up in a few minutes.

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