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Farm Machinery
Machinery
JD 6420S head gasket advise please.
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<blockquote data-quote="Timbo" data-source="post: 7859006" data-attributes="member: 772"><p>Check block for flatness and check none of the liners have sunk.</p><p>Have head checked & a skim as necessary, even if it's flat - a facing skim will clean it up.</p><p>Replace the headbolts - they aren't re-useable - current bolts are more "stretchy" n clamp the head better. </p><p>Clean out the block threads & make sure no oil or coolant remains in them.</p><p>Get a headset & gaskets. The MLS HG is only for the 6 cylinders I believe. The JD set comes with, bizarely, a sump gasket - vapormatic set you can mix n match.</p><p>Injectors will have to come out to skim head, keep them in order and do not be tempted to clean the tips., Replace the O rings, copper washers and the transfer tubes. Expensive yes, but they willl leak if you dont. </p><p>If you have removed the exhaust manifold with no broken bolts, well done, if not, get a new set as they are also stretch bolts. also 4 x gaskets.</p><p></p><p>Finally observe all the tightening torques to the letter -esp the head bolts . .</p></blockquote><p></p>
[QUOTE="Timbo, post: 7859006, member: 772"] Check block for flatness and check none of the liners have sunk. Have head checked & a skim as necessary, even if it's flat - a facing skim will clean it up. Replace the headbolts - they aren't re-useable - current bolts are more "stretchy" n clamp the head better. Clean out the block threads & make sure no oil or coolant remains in them. Get a headset & gaskets. The MLS HG is only for the 6 cylinders I believe. The JD set comes with, bizarely, a sump gasket - vapormatic set you can mix n match. Injectors will have to come out to skim head, keep them in order and do not be tempted to clean the tips., Replace the O rings, copper washers and the transfer tubes. Expensive yes, but they willl leak if you dont. If you have removed the exhaust manifold with no broken bolts, well done, if not, get a new set as they are also stretch bolts. also 4 x gaskets. Finally observe all the tightening torques to the letter -esp the head bolts . . [/QUOTE]
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JD 6420S head gasket advise please.
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