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Bobcat Skidsteer Forums
General Bobcat Skidsteer Forum
Kubota V1702 Valve Clearance
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<blockquote data-quote="Tazza" data-source="post: 1730" data-attributes="member: 82"><p>Ok, as the thread name states, i have a 743 with a Kubota V1702 engine that i fiddled with today. It has never started as easily as i believe it should. I checked the head bolt tension and most of them required 1/2 or more of a turn to reach tension. I had a quick look at the valve clearance and they seemed to be out, so i got the feeler gauge out and they were indeed out, not by a little, but ALOT as in so far that you loosen the adjusting screw and you see the valve spring move. Most were close but 2 or 3 you could see the spring move.... After setting them up as per the book, it started up but there is a funny noise at medium RPM and under load it blows a fair bit of black smoke, almost like 1 pot isn't firing, but this would usually be white if that was the case rite? I removed the tube line to no1 injector and turned the engine over till it spurted fuel out when it hit TDC, so i knew the firing sequence after that. The book says .007- .009so i went .008</p><p></p><p>I haven't put a compression gauge to it yet, i need to borrow one. With how loose the head bolts were, i would guess it may have cut the head gasket between pots. I do have a spare gasket that i can use.</p><p></p><p>Also, just how much blow-by do these engines usually have? this one seems to blow a fair amount of air out the breather tube.... It starts without problems if you glow it for 30 seconds on a 30 degree C day.</p><p></p><p>Any comments or ideas? (other than the usual, your an idiot, you should have left it alone....)</p></blockquote><p></p>
[QUOTE="Tazza, post: 1730, member: 82"] Ok, as the thread name states, i have a 743 with a Kubota V1702 engine that i fiddled with today. It has never started as easily as i believe it should. I checked the head bolt tension and most of them required 1/2 or more of a turn to reach tension. I had a quick look at the valve clearance and they seemed to be out, so i got the feeler gauge out and they were indeed out, not by a little, but ALOT as in so far that you loosen the adjusting screw and you see the valve spring move. Most were close but 2 or 3 you could see the spring move.... After setting them up as per the book, it started up but there is a funny noise at medium RPM and under load it blows a fair bit of black smoke, almost like 1 pot isn't firing, but this would usually be white if that was the case rite? I removed the tube line to no1 injector and turned the engine over till it spurted fuel out when it hit TDC, so i knew the firing sequence after that. The book says .007- .009so i went .008 I haven't put a compression gauge to it yet, i need to borrow one. With how loose the head bolts were, i would guess it may have cut the head gasket between pots. I do have a spare gasket that i can use. Also, just how much blow-by do these engines usually have? this one seems to blow a fair amount of air out the breather tube.... It starts without problems if you glow it for 30 seconds on a 30 degree C day. Any comments or ideas? (other than the usual, your an idiot, you should have left it alone....) [/QUOTE]
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Kubota V1702 Valve Clearance
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