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Bobcat Skidsteer Forums
General Bobcat Skidsteer Forum
Bobcat 632 - Blown Head Gasket?
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<blockquote data-quote="dfb" data-source="post: 124484" data-attributes="member: 11792"><p>Once you get the timing set, lock it down and don't move it again unless you put the light on it and see it as not correct. Follow the manufacturers timing procedure, if it has a vacuum line it probably needs to be disconnected and plugged during adjustment. </p><p>The way it runs, it sounds like it either has late timing or a lean running condition.</p><p>When setting up a motor there are certain items that should be done in order because they should not be variables.</p><p>1st would be basic mechanical condition, you have already been inside the motor if all is good the compression should be equal +or - no more than 10% from highest to lowest reading cylinder. Valve adjustment would be next and would also be reflected by compression readings being off if not correct.</p><p>2nd would be base ignition timing. As discussed above, follow manufacturers spec and procedure.</p><p>3rd would be fuel adjustments. Be sure there are no vacuum leaks, all the intake manifold fitting are connected, good gaskets and not missing broken hoses. Fuel dripping out of the carb is a problem. You could have a needle seat issue from moving the carb around or tipping it...this is can be a topic unto itself, but idle and mixture adjustments can only be made after all these items are set correctly. </p><p>Great work getting this far with it.</p></blockquote><p></p>
[QUOTE="dfb, post: 124484, member: 11792"] Once you get the timing set, lock it down and don't move it again unless you put the light on it and see it as not correct. Follow the manufacturers timing procedure, if it has a vacuum line it probably needs to be disconnected and plugged during adjustment. The way it runs, it sounds like it either has late timing or a lean running condition. When setting up a motor there are certain items that should be done in order because they should not be variables. 1st would be basic mechanical condition, you have already been inside the motor if all is good the compression should be equal +or - no more than 10% from highest to lowest reading cylinder. Valve adjustment would be next and would also be reflected by compression readings being off if not correct. 2nd would be base ignition timing. As discussed above, follow manufacturers spec and procedure. 3rd would be fuel adjustments. Be sure there are no vacuum leaks, all the intake manifold fitting are connected, good gaskets and not missing broken hoses. Fuel dripping out of the carb is a problem. You could have a needle seat issue from moving the carb around or tipping it...this is can be a topic unto itself, but idle and mixture adjustments can only be made after all these items are set correctly. Great work getting this far with it. [/QUOTE]
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General Bobcat Skidsteer Forum
Bobcat 632 - Blown Head Gasket?
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