I'm in the process of tearing into my 258 and I was very pleasant to see that the engine was just recently rebuilt sometime before I aquired the jeep. I still wanted to check everything to make sure that the previous rebuilder didn't take any short cuts. Well I took the head off, and pulled out the pushrods a couple of days ago. I kept everything organized and in line. Just today I went to rotate the block to take the oil pan off and I forgot all about the lifters. Needless to say, the lifters went all over the floor. I wouldn't of cared but these lifters look almost brand new. I looked them over and I didn't see any nicks in them from hitting the floor. Would you recomment reusing the lifters? I'm thinking that since they have very little wear, I'll just clean them up, and throw them in. But, they will not be in their original locations. What do you think?
most will say that lifters and the cam need to be replaced as a new set. When I had a ticking lifter, I was able to replace just the lifters as the bottoms were very flat and show no signs of being scored or concave. I ran another 100K with no problems....so yes, if the lobes and the lifter bottoms are perfect, they will rewear and rematch so to speak. It's a small gamble, but I would do it. If you did overlook a nick or dent, it will show itself when you try to slide it back in...any resistence....stop and inspect it.
The general rule is to keep everyone item you pull from the engine in an organized arrangement so they go back into their original locations and orientation during assembly. Pistons, Rods, Lifters, Push Rods, Rockers and even bolts and bearings as these items have been fitted and worn together since assembly. But when it comes to valve tappets or lifters you have only one surface contact area to worry about as most of rebuilds do not include new push rods and rockers and most of the time you reuse your old ones that you kept in order during removal. In my opinion, you have a very low risk of developing a valve ticking on a freshly rebuilt engine with low mileage if you decide to reuse the lifters that fell out. I would however, apply some break-in lube to both surfaces of the lifters and cam before startup. A cam lobe and bottom surface of the lifter would need to show signs of being polished in order to be of concern since most lifters will rotate within the engine as they move up and down. If the bottom of the lifters show any signs of grooving, concaving or are polished, then you would need to replace them as a set. A new set of lifters will cost you anywhere from $170.00 to $200.00 bucks.
I have to agree with Keith. If they look and are new, the odds are they haven't been broken in yet. If you are worried, you can run a straight edge across the bottoms of them to see how big a divot is there. No divot, no real worries as far as I know.
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Have reused cam and lifters not knowing the original order in dirt track engines before. Have had no problems. It's not ideal but I would do it. You will only have a problem if there was already a wear problem started.
I have also reused mixed lifters without issues (use a very straight edge and a very strong light to inspect the bottoms). I have also experienced issues after replacing both cam and lifters (did everything right, but the manufacturer didn't; bad cam heat treating).
Its mostly a matter of luck, if you are lucky it will work..."Do you feel lucky?"...
...a well prepped, well driven, vehicle should do well in any terrain, including the highway.
Carburetors became obsolete during the last century... do what ever it takes to get fuel injection...It makes bigger grins off road.
Fredrok is correct that the lifters will have a crown. I still would reuse since the engine has very little time on it. Any problem it will have it was gonna have anyway. Also one thing you may want to remeber in the future that will save a ton of money. IF IT AIN'T BROKE DON'T FIX IT!
Summit has Sealed Power lifters for $3.50.
I found lifter for $2.44 through FastEngineParts.com, The guy said that they are made by Jansen... has anyone heard of those?
At these prices, I'm at least replacing the lifters.
I started looking at Cam and Lifter kits, The Jeep Rebuilders book that I have (by Moses) suggested Comp Cams 252 Camshaft for good torque. It is suppose to be a direct replacement.
I take it that I do not have to change valve springs with this cam?
Will this cam work well with a 4.0l head swap if I decide to do that in the future?
Also, It says that this cam is not for fuel injection. Why is that? I 'm planning on doing the "junkyard" TBI conversion. Can I still use this cam?