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Bobcat Skidsteer Forums
General Bobcat Skidsteer Forum
Bobcat 632 - Blown Head Gasket?
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<blockquote data-quote="cdmccul" data-source="post: 124009" data-attributes="member: 9318"><p>I think what Jyuma1 is saying boils down to: </p><p></p><p>"Clean the threads in the block, clean the bolts, clean the head. Then follow the instructions in the manual, or in the head gasket packaging, on how to torque each bolt. Use oil only if the instructions call for it."</p><p></p><p>Chase the threads in the block with a good quality sharp tap. Ideally a "bottoming" tap. Blow air into and across the holes to blow them clear (watch your eyes, and ears).</p><p></p><p>Check the gasket packaging for torque spec and instructions... Yes, the engine was designed to be built a specific way, but the gasket was made much more recently. I would follow current gasket instructions over old printed manual ones.</p><p></p><p>Generally, you'll want to bring the bolts down to spec in stages. Following the torque pattern and order, (or following a cris-cross pattern starting in the center of the gasket and working outward if not defined), torque each bolt first to 1/3rd the torque, then 2/3rd, then the final 3/3rd (20, 40, 60 pounds, for example). If the spec then shows to turn the final 90 degrees, do that as a 4th step. I don't know for sure, but that engine is such an old design I would doubt it uses that 4th step.</p><p></p><p>Be careful when turning the wrench... The difference between 90 pounds and 100 pounds is NOT even a half turn, likely not even a quarter turn of the bolt. Torque will build quickly.</p></blockquote><p></p>
[QUOTE="cdmccul, post: 124009, member: 9318"] I think what Jyuma1 is saying boils down to: "Clean the threads in the block, clean the bolts, clean the head. Then follow the instructions in the manual, or in the head gasket packaging, on how to torque each bolt. Use oil only if the instructions call for it." Chase the threads in the block with a good quality sharp tap. Ideally a "bottoming" tap. Blow air into and across the holes to blow them clear (watch your eyes, and ears). Check the gasket packaging for torque spec and instructions... Yes, the engine was designed to be built a specific way, but the gasket was made much more recently. I would follow current gasket instructions over old printed manual ones. Generally, you'll want to bring the bolts down to spec in stages. Following the torque pattern and order, (or following a cris-cross pattern starting in the center of the gasket and working outward if not defined), torque each bolt first to 1/3rd the torque, then 2/3rd, then the final 3/3rd (20, 40, 60 pounds, for example). If the spec then shows to turn the final 90 degrees, do that as a 4th step. I don't know for sure, but that engine is such an old design I would doubt it uses that 4th step. Be careful when turning the wrench... The difference between 90 pounds and 100 pounds is NOT even a half turn, likely not even a quarter turn of the bolt. Torque will build quickly. [/QUOTE]
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General Bobcat Skidsteer Forum
Bobcat 632 - Blown Head Gasket?
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