INSPECTION AND REPAIR Cylinder head (1) Inspection Check the gasketed surface of the cylinder head for flatness by using a straightedge and thickness gauge as in the case of checking the crankcase surfaces. This check is to be made with the precombustion chamber jets removed. Use a surface grinder to reface the cylinder head, as necessary, to the specified flatness. Specifications Unit: mm (in.) B- L...::t=--- ..... --_ .... ~ ... ·F I o Checking cylinder head gasketed surface for flatness (2) Precombustion chamber jet replacement Do not remove the jets unless they have to be re- placed.
To remove the jet as when cracks are noted in it, drive it out with a drift pin of about 6 mm 0/4 in.) diameter inserted through glow plug hole, as shown. Removing precombustion chamber jet A·lntake port C·Jet B-Exhaust port © Direction of precombustion chamber jet orifice in installed state -16 - Item Standard Repair limit Warpage of gasketed surface of cylinder head O.OS,max (0.0020) 0.20 (0.0079)