Bad lifter or something more serious?
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Bad lifter or something more serious?
Last week I was driving my truck and it quickly developed a pretty loud tick. I drove it about 10 miles home after that. After listening to the engine with a stethoscope I decided it was in the valvetrain. The engine has about 5000 miles on it. When I first pulled the valve covers I spun the oil pump & had oil up to all my rockers. Upon inspection, I noticed that the rocker on the #4 exhaust valve was very loose (approx. 0.080” clearance). I pulled the lifter and noticed that the surface that runs on the cam was not as smooth as it should be. I pulled the adjacent lifter and found that the #4 exhaust lifter is about 0.150” shorter than the adjacent one. I can’t see the cam lobes very well but just feeling with my finger on the base circle I can’t feel any difference between the one #4 exhaust & the #4 intake lobes. Do you think I just got a bad lifter or is there likely a more serious problem here? Should I replace all the lifters? Should I pull the cam or just try to look at it the best I can from the top of the engine? In advice would be greatly appreciated.
FTE Legend
Joined: Jun 2006
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From: Ottawa, Ontario
The body of the lifter is 0.150" shorter? If so that would indicate a lot of wear or real bad quality control.
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We have a trend building:
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New oils lack zinc additives that are needed for non-roller cams in older motors, so I hear....
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New oils lack zinc additives that are needed for non-roller cams in older motors, so I hear....
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Junior User
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I used Rotella with a break in additive for break in, & have been using Rotella since then. I thought that would keep me from having this problem, but I guess not. I'll try to see what the cam lobes look like & post an update this afternoon.
Postmaster
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From: Hollister MO
would this be good?
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Hotshot
Joined: Jul 2002
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From: Bend,OR
the Rotella is great oil to be using.
hard to say what the issue is just yet though. pulling the cam may be your only option at this point.
hard to say what the issue is just yet though. pulling the cam may be your only option at this point.
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I took some valve lift measurements today. While my measurements weren't exact, I kept coming up with 0.070"-0.100" shy of the spec on that valve with a solid lifter in. On the adjacent intake valve I measured w/in 0.010" of the spec. Looks like the cam is coming out.
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Pulled the cam today. That one lobe is worn down about 0.060". All the other lobes are perfect. I don't think it was a bad (i.e. soft) camshaft or the damage would have been more widespread. I'm blaming this one on the lifters (Summit brand).
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