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Harry Ferguson Tractors Discussion Forum
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Dry Rocker Arms

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Griz

06-02-2006 16:22:32




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It"s been very rainy the last couple of days. Thought I would give the valves a check and clean the chunky pieces out of the gas tank. I had the head off of my To-20 to replace a couple burnt valves, two weeks ago. I noticed the springs, rocker arm ends and the caps on top of the valves where totally dry. There was even a little dust on the buckets on top of the springs. Is this normal?
I ran it for a few minutes with the valve cover off. There seems to be plenty of oil running out of the rocker arm shaft. I thought there should be a little oil splashed around to lube the rocker arm ends but, there wasn"t. The oil pressure runs at 25 to 30 psi.
Am I getting excited about nothing or is there a problem?

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John (UK)

06-03-2006 12:01:48




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 Re: Dry Rocker Arms in reply to Griz, 06-02-2006 16:22:32  
The oil shouldn't be running out of the Rocker shaft it should only come out of the hole in the top of the rockers. It can be that the Rocker Shaft has turned like Mike has said. If the oil is coming out of underneath the rockers then the bushes in the arms are worn and need replacing. The ends of the Rocker shaft should be plugged to allow the pressure to build up and come out onto the Rockers, did you notice if the ends of the Rocker shaft had a cap to block it.

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Griz

06-04-2006 06:58:18




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 Re: Dry Rocker Arms in reply to John (UK), 06-03-2006 12:01:48  
Hello John
The aluminum caps are on the the ends of the rocker shaft. Oil comes out the ends of the the rocker arms at the adjustment screw. None comes out on the valve side. I don't know if this is normal. I put the rockerarm assy. under water with air on it. Air came out of the ends of the rockers at the adjustment screws an none on the valve side. Either this is normal or all of the valve side passages are plugged.
The only way to know if it is OK is to run the tractor and then check to see if the springs are dry. I'm off to mow a few acres at my Mother-in-law. I'll check when I'm done.
Griz

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John (UK)

06-04-2006 08:07:25




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 Re: Dry Rocker Arms in reply to Griz, 06-04-2006 06:58:18  
Does a lot of oil come out of the rockers or only a small amount, I am wondering if you are not getting a full flow up to the Rocker Shaft. You could try spinning the engine over without the valve gear on or any plugs in it to see how much oil comes up the feed on the head. There is a plug on the back of the Cylinder head and it can get restricted with gunge in there, we had a few like that. There is a restrictor in there to stop it getting too much oil up at the top, so maybe it is getting blocked up. Probe it and blow it out, see what happens then.
If there isn"t enough oil getting up to the valves, any oil that you did get up there would go to the easiest point to flow so maybe that is why it is all going to the adjusting screw side of the Rocker. It would be a great coincidence if it were all the oil feeds to the valve side were blocked. I think that while you are checking the oil flow I would strip the rocker shaft down and make sure that the oil feed holes are pointing towards the valves and not the adjustment screws. Make certain that the rockers/springs/push rods etc. all go back in the original place.

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Griz

06-05-2006 08:26:01




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 Re: Dry Rocker Arms in reply to John (UK), 06-04-2006 08:07:25  
Hi John Gave her a quick check. Hasn't been run since yesterday so the oil has drained off. Appears to be oiling the valve side now. Atleast, the vales were not totally dry as before. I mowed about four acres with her yesterday. I did turn the motor over the other day with the lifter assy. off. It took quite awhile to get oil out of the head. It didn't spurt up as I expected. It pulsed about a half an inch high. That is only cranking not running, that is probally good. The main thing was only oil came out, I was happy about that.
When I checked this morning, i wanted to check the alignment pin. There are holes on only one side of the shaft. I thought it might be possible to get it 180 degrees out of position. There is only one pin and slot for it go in. There is no way to make a mistake. If there was a way I'm sure I would have maded up.
When I had it apart the other day, I slid all of the rockers away from the shaft holes and blew them out. Maybe the solvent helped. It seems to be getting some oil now. I'll keep checking after each of the next few mowings. Thanks for your advice.
Griz

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John (UK)

06-05-2006 08:56:06




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 Re: Dry Rocker Arms in reply to Griz, 06-05-2006 08:26:01  
Lets hope that you have cured the problem then. Oil would not spurt up out of the head as the feed is restricted so that it doesn"t get too much oil up there and start getting sucked down the valve guides, which is what would happen. Sliding the Rockers to one side and blowing it all out would do a power of good, you have most likely moved whatever was causing the problem. Just check again after it has worked for a while if everything is coated in oil then you should have no further problems with it. You are welcome to any advice that you may need, anytime...John

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Griz

06-03-2006 07:52:50




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 Re: Dry Rocker Arms in reply to Griz, 06-02-2006 16:22:32  
I took lifter assy. out and sprayed solvent down the inside of the shaft. I used air to blow out the solvent. Just the pushrod side of the rocker arms had any solvent coming out. Don't know if there is an oil passage to the valve side of the rocker arm. If there is all eight of them are plugged up. Put the engine back together. There seems to be quite a bit more oil coming out the push rod side. None on the valve side.
I'll go cut some grass and take her apart again and see if the valves have any oil on them.
The aluminum plugs are on the ends of the shaft. The pin is there and not sheared off. I noticed the oil woun't flow if the rod is not located properly. A missing pin would really mess things up.
Thanks guys.

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Gerald J.

06-02-2006 21:35:12




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 Re: Dry Rocker Arms in reply to Griz, 06-02-2006 16:22:32  
There should be corks in the ends of the hollow rocker arm shaft to hold the oil in. Then it can oil the rocker arms.

Gerald J.



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Mike Mohrhauser

06-02-2006 20:10:50




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 Re: Dry Rocker Arms in reply to Griz, 06-02-2006 16:22:32  
Griz,
There should be a locator pin in the rocker arm shaft to keep it from turning. Occasionally the pin will shear off or may fall out. It is located on the right side of the shaft on the second from the rear rocker arm assembly support. If the shaft turns a little oil may squeeze by but there won't be enough to oil the whole assembly. At an idle you should have oil flying all over the engine. I did battle with this problem on my TO-20 about a tear ago. If you have any other questions that I can help with, send me an email.

Mike M.

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