Les Henson Posted December 22, 2007 Share Posted December 22, 2007 How do you determine what head gasket to use? I have a new head with new valves on a standard block with standard big-end, small, and main bearing shells. I have a dial guage, so can measure piston protrusion. Is (for instance) 3mm protrusion mean I use a 3-notch gasket? At what point do I measure the protrusion - there's a flippin' great hole in the piston. Do I measure all 4 and then work from an average? Ta. Les. Quote Link to comment Share on other sites More sharing options...
western Posted December 23, 2007 Share Posted December 23, 2007 measure the piston top face[i'd take 3 or 4 readings from the outer edge] from the block face, Tdi head gasket sizes & which to fit for certain protrusion ranges Quote Link to comment Share on other sites More sharing options...
BogMonster Posted December 23, 2007 Share Posted December 23, 2007 Start it up and if you hear clangclangclangclangclangclangclangclangclangclangclangclangclangclang you need a thicker gasket Quote Link to comment Share on other sites More sharing options...
western Posted December 23, 2007 Share Posted December 23, 2007 Start it up and if you hear clangclangclangclangclangclangclangclangclangclangclangclangclangclang you need a thicker gasket & another engine Quote Link to comment Share on other sites More sharing options...
Les Henson Posted December 23, 2007 Author Share Posted December 23, 2007 Sorry it took me an hour to reply to your post Bogmonster - I was laughing so much I couldn't get off the floor Les. Quote Link to comment Share on other sites More sharing options...
Porny Posted December 24, 2007 Share Posted December 24, 2007 From the workshop manual: Cylinder Head Gasket Selection. CAUTION: New cylinder head gasket should be same thickness as the original. If, however, cylinder head, pistons or crankshaft have been replaced, it will be necessary to check piston stand proud in order to determine the correct thickness of gasket. 1. Position a magnetic base DTI to cylinder block top face adjacent to number 1 cylinder bore. 2. Position stylus of gauge to cylinder block top face on edge of number 1 cylinder bore; zero gauge. 3. Rotate crankshaft in a clockwise direction until numbers 1 and 4 pistons are at TDC. 4. Position stylus of DTI gauge near edge of piston crown, measure and record number 1 piston stand proud. Measurement must be taken at front and rear of piston and highest protrusion figure recorded. 5. Repeat above procedures for remaining pistons. 6. From all of the readings obtained, determine highest protrusion figure and select the appropriate cylinder head gasket. Protrusion 0.50 to 0.60 mm - select gasket with 1 identification hole. Protrusion 0.61 to 0.70 mm - select gasket with 2 identification holes. Protrusion 0.71 to 0.80 mm - select gasket with 3 identification holes. Protrusion 0.81 to 0.90 mm - select gasket with 0 identification holes. NOTE: Identification holes are located on the edge of the gasket. 7. Remove DTI. 8. Rotate crankshaft in a clockwise direction until all pistons are half-way up cylinder bores. Ian Quote Link to comment Share on other sites More sharing options...
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