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#1
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m119 cam reinstallation
I am trying to round the corner on my guide replacement and get my cams installed and in the correct place so that I can put the engine back together. Right now I have the cams all bolted down, (not torqued yet) I still need to tighten the sprocket on the pass exhaust cam and turn the engine. I did loosen the bolts on the guide tensioner to pull the chain around that last sprocket. now do I have to take it out and reseal it or can I just tighten it back up? After that I just turn the engine a few times and check the pins at the cams and if its ok then I can begin reassembly?
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#2
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Today I torqued everything and spun the crank a few times. Now the left bank pins at 38 and the right bank at 15. How can I get the cams in the correct place? Can't spin them with the chain on. Plus I don't have the special wrench.
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#3
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When you first installed the cams in the head, did you position them at least close to the timing they should be?
When you spun the engine, did you turn the crank by hand or starter motor? Some engines are valve benders and need to have cam timing correct from the very beginning. |
#4
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Yes I had them all at or very close to 45 but when I put the tensioner in it pulled the right side off the most and the crank moved a little bit making the left side off.
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#5
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45 ?what?
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#6
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I believe your timing should be o degress, or ot mark on balancer with cams pinned and no slack, sounds like you need to start over,,start with drivers side cams , take out all the slack or leave a little so the cams can be moved
into the no slack position with pin locking the exhaust cam drivers side, then intake drivers side , then intake passenger side , and finnaly passenger exhaust , and mak sure you don't move the crank, which sounds like what happened, ,YOU CANNOT MOVE THE CAMS AFTER THE CHAIN IS WRAPED AROUND THE GEARS, don't try , start over , and it helps to inset a plastic wedge at passenger side prior to installing exhaust cam sprocket, note , a wrench will be neede to move cams left/right into position |
#7
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I put the balancer at the 45 mark Is that not correct? Im pretty sure it is. So before i start again. should I loosen the tensioner and then try to spin the cams into pin position? Im just not sure I will be able to spin them with the chain on. Really appreciate your help. I cant get any advice from anyone else
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#8
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my mistake yes 45 degrees, pinned cams at all 4 cams
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#9
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Just mark cam to cam chain positions , and loosen cam,s again and rotate , according to your mark,s left or right, you will need a wrench on flat of cam , do not use pliers, the last cam the exhaust may need some finesse , get the gear on the chain then move cam into gear
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#10
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Sorry, I'm slow. Should I remove the exhaust cam sprocket again? Should I loosen the tensioner?
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#11
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Ok Thanks to your help I think I am on the right track. I removed the pass side sprocket again. And loosened the tensioner. I pulled the chain as tight as I could and I got all 4 cams pinned And I have to put the sprocket back on and tighten the tensioner back in. I need to figure out if there is a specific way to do this so that the crank doesn't spin again.
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#12
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went and made another attempt. I put the sprocket back on then tightened the tensioner. Turned the crank a few times and the driver side went to 38 and the passenger side went to 33. I guess the chain just wasn't pulled all the way. im not sure how to get it right so I will just keep trying i guess
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#13
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update. I didnt get it right. i now have all the cams back out again and I am ready to start from the driver side over. But I would really like to know how to do it correctly from the start. Does the sprocket need to be off that cam? Once that cam is in place there is not enough room between the guide and the sprocket for the chain to move any links
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#14
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While you have the cams out, be sure to measure lifter height in comparison to others in that row. If you bent a valve one or more will be lower than the others. Another check with cam installed is to have a lobe pointed away from the lifter ( on the base circle ) and see if there is a gap.
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#15
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Start with first cam,exhaust driver's side, you dont need to remove the gear ,slip chain over gear and visually see that when its tightened down ,and rotated all the way therby removing slack ,that you can pin it.if you dont get it right mark chain to gear and remove , rotate position and reinstall, you will be correct when that cam is rotated all the way left removing slack and able to pin it , note the third cam intake passenger side may want to jump a tooth, slide a wedge between th chain an head to hold it till its pinned, the key is get all the slack out, but not moving crank out of 45 degree position
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