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Farmall & IHC Tractors Discussion Forum
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clacking sound / burned glow plugs

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BABOS

07-01-2005 16:48:34




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After rebuild have a loud clacking sound in #1 when at operating temp. No sound when first started and cold. Clacking occurs at 1400 rpm an up. Nothing at idle. Have swapped the injector, but made no difference. Piston is not hitting any thing that I have checked, and no marks on the piston. Any-one had this sound before, and what is the cause?
Is there suppose to be a resistor before the glow plug indicator ,as the glow plugs are being burnt off in a short time?
Ron

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P Backus

07-02-2005 07:02:59




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 Re: clacking sound / burned glow plugs in reply to BABOS, 07-01-2005 16:48:34  
Ouch, that doesn't sound good!
Are you sure that the rod cap is torqued up properly? Did you change out the timing gears? I've heard them clack. It could be in the valve train- if so it would clack at one half of engine speed (700 clacks per min. at 1400 engine rpm). Wrist pin? Just thinking aloud here. What was all done in the rebuild? All new bearings? I once had an oil pump driven gear crack and started to clack after a rebuild.
I don't know about the glow plugs. Are you sure that the switch isn't sticking and keeping them on too long? What tractor is this in? More info would be helpful- keep us posted.
Paul

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jossette

07-01-2005 20:17:48




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 Re: clacking sound / burned glow plugs in reply to BABOS, 07-01-2005 16:48:34  
injector pump timed right???



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Babos

07-02-2005 04:20:24




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 Re: clacking sound / burned glow plugs in reply to jossette, 07-01-2005 20:17:48  
Is it possible to have only #1 making the noise, and not the others with the pump timing out?



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jossette

07-02-2005 06:47:04




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 Re: clacking sound / burned glow plugs in reply to Babos, 07-02-2005 04:20:24  
what are you working on
ih
cat
cummins
detroit
johndeere
?????

soinds like a valve spring dropped or the injector is not opening up or that line is plugged, or the lines are rubbing together and there is pin hole letting in air...while running with a slight crackling noise--- crack the line at the pump to see if fuel comes out. crack the line at the injector to see if fuel is there. somewhere it needs to get fuel..

worse case?? scored cyclinder

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BABOS

07-02-2005 10:02:58




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 Re: clacking sound / burned glow plugs in reply to jossette, 07-02-2005 06:47:04  
The tractor is a b275 IH. New liners, pistons, pins , rings, pins, rod bearings (good clearances) and a reconitioned head with valves installed. The sound is loudest at the #1 injector, with none anywhere else in the engine. Changed injector with no difference. Checked piston to head clearance and found it ok. Pre-cups are new and have clearance to the piston. Rotated injection pump both ways and is quieter one way than the other , but the noise will not disappear. Cold engine no noise at any rpms, but at operating temps, idle none, 1200-1500 rpm is loudest clacking and from 1700 and up noise can bearly be heard at all. Load has little effect on the sound.
Ron

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jossette

07-02-2005 15:01:26




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 Re: clacking sound / burned glow plugs in reply to BABOS, 07-02-2005 10:02:58  
I am guessing the noise was not there when you rebuilt it?? recheck the clearance at the valves...did you replace the cam and or bearings? oil pressure is good?? Did you grind the crank with the new bearing? was #1 cyl bearing showing some copper when you took it apart??



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BABOS

07-03-2005 18:24:13




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 Re: clacking sound / burned glow plugs in reply to jossette, 07-02-2005 15:01:26  
Now that I think about it, that clacking was there before rebuild, but only if the engine was at idle and the throttle was abruptly opened. As soon as the engine reached the rpm the throttle was set for, the clacking went away. Could this be a clue to the source?
Ron



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jossette

07-05-2005 15:53:26




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 Re: clacking sound / burned glow plugs in reply to BABOS, 07-03-2005 18:24:13  
lifter or a loose crank bearing



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BABOS

07-05-2005 17:07:24




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 Re: clacking sound / burned glow plugs in reply to jossette, 07-05-2005 15:53:26  
I don"t buy the lifter,as it has nothing to do with load. The oil pressure is rock solid which will rule out a crank bearing . Besides , the only place the sound is heard is in the head, mainly #1 injector.
Ron



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jossette

07-05-2005 17:27:05




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 Re: clacking sound / burned glow plugs in reply to BABOS, 07-05-2005 17:07:24  
its not getting fuel
or something is loose

I tried



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BABOS

07-05-2005 18:07:38




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 Re: clacking sound / burned glow plugs in reply to jossette, 07-05-2005 17:27:05  
Yup, it's a puzzler. It sounds like the piston is hitting the head, but I removed the pre-cup and then removed the the brass sealing washer. Put the pre-cup back in with piston on TDC and there was still room between the two. As the pre-cup and the head are at the same level, this should rule out piston to head contact. Wrist pin bushing had minimal wear, and no way needed replacement. Since the tractor is used for runway cutting at our airport, and the guys won't let me near it to wrench it again, I have to wait until it blows up. Then I should be able to see what it was.
Ron

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BABOS

07-05-2005 18:06:28




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 Re: clacking sound / burned glow plugs in reply to jossette, 07-05-2005 17:27:05  
Yup, it's a puzzler. It sounds like the piston is hitting the head, but I removed the pre-cup and then removed the the brass sealing washer. Put the pre-cup back in with piston on TDC and there was still room between the two. As the pre-cup and the head are at the same level, this should rule out piston to head contact. Wrist pin bushing had minimal wear, and no way needed replacement. Since the tractor is used for runway cutting at our airport, and the guys won't let me near it to wrench it again, I have to wait until it blows up. Then I should be able to see what it was.
Ron

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