lifter troubles
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lifter troubles
Hey guys, new to the site. Have a 1986 F 250 6.9. Have had 30,000 trouble free miles over the last few years. Maintenance has been kept up. The other day I went to start it in the morning, to hear a loud popping coming out of the intake. Pulled the valve cover, felt all the pushrods, to find that the #8? far back, drivers side, exhaust pushrod had all sorts of slack in it. Lifter collapsed was the consensus. Pulled intake manifold, pull out exhaust lifter. (hydraulic) pushed it in a couple times in my hand, and all of a sudden it sprung back, like there was a piece of dirt in it or something. So I bought a new lifter, put it in put everything back toghether. As I turned it over (without starting it) you could hear the noise and after about 10 rotations the lifter pumped up and noise went away. Truck runs good. This morning, I start it to hear the exact same noise! The now new lifter is not working. I rev it a few times and all of a sudden it goes away. Whats going on here? Thank you.
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From: Virginia
Change the oil if it's near it's time, and put a couple of cans of Rislone in it instead of the last two quarts of oil. This is a very high detergent additive and after you run it a couple of weeks, should loosen that stuff up in the lifters.
These engines are also very bad about wearing the valve guides in the heads, and then the valves won't seat properly. It usually happens on the exhaust side but has been known to happen to the intake valves also. When it happens to one of the exhaust valves, you can go back and listen to the exhaust pipe, and it makes a air huffing sound. It will make the same air sound in the intake if one of those is not sealing. It's the compression getting by the valve.
These engines are also very bad about wearing the valve guides in the heads, and then the valves won't seat properly. It usually happens on the exhaust side but has been known to happen to the intake valves also. When it happens to one of the exhaust valves, you can go back and listen to the exhaust pipe, and it makes a air huffing sound. It will make the same air sound in the intake if one of those is not sealing. It's the compression getting by the valve.
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From: Northeast, OK
Mike - Welcome to FTE! As for the lifter, I agree with Dave - stuff in the oil. I'd guess the previous owner wasn't as good on the maintenance as you and sludge built up. But you are changing the oil and it is cleaning the engine up. Do as suggested and use something like Rislone to aid the cleaning. But, if that does the trick you may have to run Rislone for a while - or maybe forever. I say that from experience - my brother bought a Plymouth with a 318 that had been sitting on a used car lot for quite some time, probably due to a lifter tick. He did as Dave suggested above and the tick went away - until he changed oil. Turned out he had to run a quart of the stuff in each change for all the while he had the car.
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thanks for the replies. The thing of it is, I installed a brand new lifter, replacing the one that wasn't working. Now the problem is immediately back. If it was dirt/sludge that was making the lifters stick etc., then what would the chances be that the new lifter would malfunction again immediately after replacement? Could the oil hole/channel leading to that specific lifter be plugged? Also how would I know if the cam lobe was worn. Do I have to disassemble all the way to expose the cam? If it was worn, then why would the lifter not pump up for a minute, and then start working properly? Sorry about my ignorance, I'm trying to learn a lot in a little bit of time, I'm new to working on cars/diesels. Thanks.
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From: Virginia
I don't think it's the lifter. A clogged lifter will make a lot of ticking, and even possibly a dead cylinder. But not popping through the intake. A worn cam lobe, the same thing. It woudl not actuate the valve properly, so that cylinder may be down on power or dead, but it would not cause popping into the intake.
Here's a link. Don't panic, you might not have this situation, but it gives you a good look at the head, and a little education on what's going on.
TECH 101 engine chuff/ valve breaks POST MORTEM
Here's a link. Don't panic, you might not have this situation, but it gives you a good look at the head, and a little education on what's going on.
TECH 101 engine chuff/ valve breaks POST MORTEM
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did you find fix
thanks for the replies. The thing of it is, I installed a brand new lifter, replacing the one that wasn't working. Now the problem is immediately back. If it was dirt/sludge that was making the lifters stick etc., then what would the chances be that the new lifter would malfunction again immediately after replacement? Could the oil hole/channel leading to that specific lifter be plugged? Also how would I know if the cam lobe was worn. Do I have to disassemble all the way to expose the cam? If it was worn, then why would the lifter not pump up for a minute, and then start working properly? Sorry about my ignorance, I'm trying to learn a lot in a little bit of time, I'm new to working on cars/diesels. Thanks.
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if this helps at all, instead of pulling intake again and replacing all the lifters instead of just the one, I tried adding two quarts of Rislone to the oil. motor has been all good since then. must be sludge and stuff getting in the lifters. try that.
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