Intake Manifold and Cylinder Heads/Cylinder Head IMPORTANT: Do not damage gasket sealing surface while cleaning carbon deposits. 9. Carefully clean carbon deposits from combustion chamber and gasket surface on heads and cylinder block with a scraper and wire brush. M30948 -UN-14JUL89 10. Inspect head for cracks or broken cooling fins. Check gasket sealing surface for burrs or nicks. Replace head if damaged. 11. Measure cylinder head flatness in several locations. CYLINDER HEAD SPECIFICATIONS Item New Part Wear Tolerance Flat Within 0.05 mm (0.002 in.) 0.10 mm (0.004 in.) Replace head if cylinder head is warped more than 0.10 mm (0.004 in.).
CTM2 (19APR90) 10-10 16, 18, 20 & 24HP Onan Engines M98,2010K,20 -19-08OCT85 AllTractorManuals.com 130495 IMPORTANT: Do not remove cylinder heads while they are hot. Cylinder head may warp. A hot gasket will be soft and difficult to remove. 7. Remove spark plug (A). -UN-25JAN90 8. For T260 engine, remove 10 nuts, 20 compression washers (B), and 10 washers (C) to remove cylinder head and gasket (D). M36931 For P21G, P220G, B43E, B43G, OR B48G engine, remove nine cap screws and washers (E) to remove T260 Engine cylinder head and gasket (D).
A—Spark Plug B—Compression Washer (20 Used) C—Washer (10 Used) D—Gasket -UN-25JAN90 E—Washer (9 Used) M36932 P218G, P220G, B43E, B43G,B48G M98,2010K,19 -19-10FEB87 10 10