Here we go again: intake cam pretty tight
#1
Here we go again: intake cam pretty tight
Hi guys,
So I got some more time today to work on the car, and got the cam cover installed. Did everything properly, tightened a tiny bit at a time until the cover drew all the way down. Did a few more things, and finally got to putting the timing belt back on. This is where I noticed that the intake cam was considerably tighter than the exhaust. I couldn't even move it by hand at first, but after a light tap with a hammer and extension on the sprocket it freed up. I can now position it by hand, but it takes way more force than the exhaust.
I am sure that I did the torque sequence properly, but just to be sure I backed all the bolts off a little bit at a time in reverse order and torqued again. Before I torqued again, I tried to give the intake cam a little wiggle and it was just as tight as it was before. I put a dollop of assembly grease on the bottom and top of each cam bearing surface before I assembled, so unless there's just a dry spot somewhere it should be fairly well lubricated.
Any ideas what gives? Is it perhaps normal for the intake cam to be tighter? I don't want to try and start the car and have the timing belt snap because of this.
As always, I'm grateful for any insight you can provide.
So I got some more time today to work on the car, and got the cam cover installed. Did everything properly, tightened a tiny bit at a time until the cover drew all the way down. Did a few more things, and finally got to putting the timing belt back on. This is where I noticed that the intake cam was considerably tighter than the exhaust. I couldn't even move it by hand at first, but after a light tap with a hammer and extension on the sprocket it freed up. I can now position it by hand, but it takes way more force than the exhaust.
I am sure that I did the torque sequence properly, but just to be sure I backed all the bolts off a little bit at a time in reverse order and torqued again. Before I torqued again, I tried to give the intake cam a little wiggle and it was just as tight as it was before. I put a dollop of assembly grease on the bottom and top of each cam bearing surface before I assembled, so unless there's just a dry spot somewhere it should be fairly well lubricated.
Any ideas what gives? Is it perhaps normal for the intake cam to be tighter? I don't want to try and start the car and have the timing belt snap because of this.
As always, I'm grateful for any insight you can provide.
#3
Difflock, perhaps you're right. I got the timing belt on and turned her over by hand a good 10 times. Didn't feel any tighter than when I replaced the belt/tensioner a while back, at least when turning the crank. Belt happened to be a tooth off, though, so I got a chance to isolate the cams when I was redoing it. Intake is still tight as the dickens, though to a lesser degree than before. I now have a suspicion that the oil pooled at the back of the head (I poured a bit in after replacing the lifters just to make sure they stayed full of oi) may be responsible for the exhaust cam turning easier than the intake. Hmmmm....
#6
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09-22-2014 01:02 AM