| Author | Message | ||
     grant thede (roseanne.bmts.com - 216.183.128.2) |
I,m having problems keeping #1 exhaust push rod in place! It will jump out under heavy load usually going uphill, I,m plowing with 4 14,s trail plow in sod . Thought pushrod was trouble so switched with #6 and it happened again ,I noticed that the rubber oil seal on valve stem was down so i put it up to the top and checked the oil line to rocker arm .It was clear. Changed the oil and filter the old oil had 40 hours on it and 880 has ran round baler all summer. I got 45 minutes out of it before pushrod jumped again! I,m getting to good at tearing off tin and valve cover!! I put 950 gas on and it played with plow and hills! Would to tight tappet clearance cause this? all ideas welcome!! Ps. 880 is diesel thanks | ||
| Chris (d29.as2.chrl.mi.voyager.net - 216.93.88.132) |
I wouldn't think that too tight a tappet would do this. My guess is that the valve is sticking open some and then lets the push rod fall out of place with all the extra clearance. The valve spring may be weak, there might be carbon on the valve stem, a bent valve, or a scored valve might be the culprit. Hope this helps | ||
| grant (roseanne.bmts.com - 216.183.128.2) |
Update on 880 diesel. I set valve clearance to 20 thousand as per book {exhaust ] and tried again only I was plowing grain stubble on flat ground and had no trouble with pushrod , there was some tough ground but not lugging as hard , I have more sod [with hills] so will try again with 880 . the head was overhauled about 5 years ago and it see,s 50 hours a year max. I will update later thanks. | ||
| grant |
Once again THE 880 HAS got me ! Pushrod jumped after 4 hour run . I took rocker arm off and found metal pieces under arm on the shaft and the inside was scored so got a good used one and a couple pushrods and went back to the field for a 6 hour run just as I finished the pushrods on the exaust on # 3and 5 jumped out on a hard clay hill. Had to leave plow and nurse sick puppy home ! Now I wonder could the entire rack be wore out after 40 years ?? Put it back together and finished the field. Is it head ,rack or oil whatever ?? I plan on getting the rest of the rocker assembly from the wrecker and replacing mine however plowings done so may not know if its the problem till seeding time. your ideas? | ||
| Chris Losey (Admin) |
Grant, Did the head bolt with the oil hole get put back in the right hole when the head was put back on? If this bolt is in the wrong hole, then no oil can get to the rocker arms. It should be in the hole farthest to the rear on the motor, under the valve cover. Another possibility is the wrong main bearing on the rear main for the crankshaft. The oil for the valve train feeds up through a hole in that bearing. I would run the tractor with the valve cover off. There should be oil spurting up from the rocker arms. It may take a moment to reach the top of the motor, but probably just a matter of a few seconds. Our Super 88 diesel has almost 10,000 hours on it now, with the original valve train in it. The metal you've found definitely makes it look like the oil isn't getting up there. Chris | ||
| grant |
Head bolt in position I took line off and got a oil bath from top of head bolt I am going to put gauge on oil line and see what I get. That is at oil sending unit line. Would 15 lb be work range? It used to to alarm on dash at low idle but went to 15-40 oil and it quit that but that is several tear ago. It has been suggested lack of oil so may pull pan and look at screen. | ||
| Don Woods |
grant need a little more info.How hot does this engine run? Too hot or too cold can cause valves to stick from expantion or from a carbon build up.If valves ar sticking would be reason pushrod could fall out of place on hills.Sounds like a genral problem more than a isolated problem when other cylinders started bothering. | ||
| grant |
The engine runs in the mid work range I wondered if it was getting too warm myself so have watched that the last two weeks in temps from 75 to 45. I havn,t checked oil pressure yet just pressure washed it off on friday evening [in a sleet storm] so will try tomorrow as weather to be better here in ontario canada. | ||
| grant |
Update on the 880 . I took head off and the only thing we can see is carbon buildup on the valve stems. The rebuild shop said this a common problem with the indirect injection system and they back drilled the valve guides on the bottom . This breaks off the carbon if it builds up. Said they did a lot of them years ago when there were more in fulltime use. I will not be able to tell till spring work but hope it fix's the problem . maybe the super 99 I purchased in the fall will scare the 880 into action, you can be replaced!! |
