TomMull Posted May 31, 2017 Report Share Posted May 31, 2017 I have 3 spare rocker covers that range from moderately to badly deformed from over-tightening. Has anyone had any sucess with straightening the lip? I've got a new silicone gasket that will probably take care of most of the leak but it would be nice to get the cover back into shape. I did a little experimenting on the bench and found that the covers are very resistant to movement. I don't want to make matters worse. Tom Quote Link to post Share on other sites
john.r.davies Posted May 31, 2017 Report Share Posted May 31, 2017 Tom, Is this a deformity of the actual flange that carries the gasket, or a more general twist of the cover? The long six-cylinder covers are prone to the second. Twisting them back, until they lie flat on a flat surface (kitchen table top? Don't tell 'er indoors) is efective. The first is a feature of leaky sumps, and always due to the DPO having over-tightened the bolts. The flange around the bolts gets belled, so that there is less, not more pressure on the gasket between the bolts. The answer is to carefully flatten the flange, with a hammer and flat anvil-piece, until there is no light to be seen between straight edge and the flange.. No flange bolts on a rocker cover, but the same could be applied to bent flanges. I have explained the process in more detail in Another Place: http://forum.tssc.org.uk/index.php?/topic/108-correcting-the-sump-flange-to-prevent-leaks/?hl=%2Bsump+%2Bflange John Quote Link to post Share on other sites
TomMull Posted May 31, 2017 Author Report Share Posted May 31, 2017 John, It's the flange that's deformed. I have straightened a bunch of sumps as you describe but I dare not use the force required to get the rocker cover to move. At least not yet. Tom Quote Link to post Share on other sites
foster461 Posted May 31, 2017 Report Share Posted May 31, 2017 I've had good luck just using a hammer and dolly set to straighten them out assuming it is just bent and has not distorted to the point that it needs stretching/shrinking. Quote Link to post Share on other sites
RogerH Posted May 31, 2017 Report Share Posted May 31, 2017 Hi Tom, a hammer, drift and a dolly to lay it on. However whatever hits the cover make sure it is wood or plastic. If you start bashing steel with a steel hammer/drift then you will stretch the metal and that is not good. Wood or plastic will bend the metal but cause less stretching, Roger Quote Link to post Share on other sites
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