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Farm Machinery
Classic Machinery
McCormick IH 434 starting problem
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<blockquote data-quote="Wisconsonian" data-source="post: 7279460" data-attributes="member: 150618"><p>Check the voltage at the glow plugs when activated. I'd expect a heavy duty relay, or heavy duty switch on the glow plugs, any replacement is suspect, it won't handle the amps the glow plugs draw. </p><p></p><p>I wouldn't worry about compression, it's going to be bad with new rings not seated, it will make starting hard until it's broken in, but once it fires it should run even with poor compression. Poor compression will not shut an engine off after a second, only fuel or air will do that, lack of fuel or air.</p></blockquote><p></p>
[QUOTE="Wisconsonian, post: 7279460, member: 150618"] Check the voltage at the glow plugs when activated. I'd expect a heavy duty relay, or heavy duty switch on the glow plugs, any replacement is suspect, it won't handle the amps the glow plugs draw. I wouldn't worry about compression, it's going to be bad with new rings not seated, it will make starting hard until it's broken in, but once it fires it should run even with poor compression. Poor compression will not shut an engine off after a second, only fuel or air will do that, lack of fuel or air. [/QUOTE]
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Farm Machinery
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McCormick IH 434 starting problem
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