Tigger Posted July 4, 2007 Share Posted July 4, 2007 I've got hold of one of the new Land Rover gaskets and am intrigued by it's construction. The old gasket was not too difficult to understand, piece of metal with some rubber strips which got squished between the head and the block but the new LR item is a different beast altogether. 1. For a start the firing rings 'float' in the gasket with a movement of almost 0.5mm, how do these get centred on the liners. 2. Then there is the gasket thickness, even without the additional shim this appear to be quite an increase over the old Payen (?) gasket. Does this affect the compression ratio? 3. Now for the shim, I'm sure I heard somewhere that this actually 'stuck' to the head but looking at it is seems to be sprayed black. Does this stick when hot....? It certainly looks like a very engineered solution but I'd like to know a bit about how it works ... any ideas ....? Tim Link to comment Share on other sites More sharing options...
oilyhands Posted July 4, 2007 Share Posted July 4, 2007 The extra metal layers on the MLS gasket have swage lines which act in a similar manner to the elastomer seal on the earlier gasket. The fire rings have no more float than the old gasket and the overall thickness is the same, however the metal layers absorb more of the clamping authority from the bolts which lowers the forces acting on the top of the liners/fire rings themselves. This means that the MLS gasket is *less* tolerant of low or uneven liner heights than the original. The shim is designed to counteract porosity problems on the surface of the head which might cause the gasket to leak across the fire ring, the shim will bridge these areas and prevent local collapse of the material, a few heat cycles are necessary to help the shim adhere. If your liner heights are not spot on, use the original gasket (Payen BW750), if they are spot on and you are concerned about porosity on the surface of the head, use the latest MLS gasket (Payen BW5750, Land Rover LVB500190). If the shim is fitted with the gasket then the CR is lowered by around 1/3rd of a point. Oily Link to comment Share on other sites More sharing options...
Sheds Moderator Posted July 4, 2007 Share Posted July 4, 2007 Y'know something, anyone would think Oily knows a bit about the K series. Link to comment Share on other sites More sharing options...
Tigger Posted July 4, 2007 Author Share Posted July 4, 2007 Thanks Dave. I consider myself suitably enlightened. Link to comment Share on other sites More sharing options...
Steve T Posted July 4, 2007 Share Posted July 4, 2007 He could be bluffing ! Steve Now with DVA Power! 191bhp and 150.9 lbft torque. My Pictures Link to comment Share on other sites More sharing options...
Mr Locust Posted July 5, 2007 Share Posted July 5, 2007 Also mentioned here Ian Green and Silver Roadsport 😬 Link to comment Share on other sites More sharing options...
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