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Henry se/k! View Drop Down
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Joined: 08 Mar 2010
Location: Kincaid Kansas
Points: 403 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Henry se/k! Quote  Post ReplyReply Direct Link To This Post Topic: Question for DrAllis
    Posted: 13 Nov 2011 at 9:15pm
Buddy has 4 cyl dis in ac backhoe. Engine was stuck. Rebuilt motor and instaled inj pump at top dead center. Would not start.Look in book, it said 25 deg before tdc. Started well but missed on no 1 cyl. 400lbs comp,changed injector same result, white smoke. Loosen line smoke stops.Could the pump be 1/2 off and still run on 3 cyl? What other things could cause this?   Thanks for any information
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DrAllis View Drop Down
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Joined: 12 Sep 2009
Points: 21944 		Post Options Post Options   Thanks (0) Thanks(0)   Quote DrAllis Quote  Post ReplyReply Direct Link To This Post Posted: 13 Nov 2011 at 9:31pm
Stick the number one injector in another hole and see if the problem follows it.....I'll bet it does.....400 psi compression with the starter is good.....400 psi with engine running is low.
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Henry se/k! View Drop Down
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Points: 403 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Henry se/k! Quote  Post ReplyReply Direct Link To This Post Posted: 13 Nov 2011 at 9:36pm
Book says 400 lbs at 600 rpn. Inj works fine in 2 or 3 hole
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DrAllis View Drop Down
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Joined: 12 Sep 2009
Points: 21944 		Post Options Post Options   Thanks (0) Thanks(0)   Quote DrAllis Quote  Post ReplyReply Direct Link To This Post Posted: 13 Nov 2011 at 9:39pm
Then, compression test the other holes and see what they actually are. I'm used to closer to 500 psi on a fresh engine. I also assume this is an Allis engine and not a Perkins?
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Henry se/k! View Drop Down
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Points: 403 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Henry se/k! Quote  Post ReplyReply Direct Link To This Post Posted: 13 Nov 2011 at 9:46pm
Yes it is the later model with ac engine, Will check other cyl Monday   Thanks
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DrAllis View Drop Down
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Points: 21944 		Post Options Post Options   Thanks (0) Thanks(0)   Quote DrAllis Quote  Post ReplyReply Direct Link To This Post Posted: 13 Nov 2011 at 9:49pm
Don't know where you got your pistons&sleeves, but there are 14 to 1 and 15 to 1 and 16 to 1 compression ratio pistons....you should be using 16 to 1 on that application and maybe (just maybe) you've got one WRONG piston ?
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Henry se/k! View Drop Down
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Points: 403 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Henry se/k! Quote  Post ReplyReply Direct Link To This Post Posted: 14 Nov 2011 at 7:04pm
Up date on miss! Checked cam gear that was changed. Casting no was same as old gear but no stamped on out side of gear was different! 1/2 tooth different in placement of keyway. Will find different gear tues.Dont now this would make it miss only no 1. update due after we change gear.
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