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the best way to adj lifters on a 5.7l vortec


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#1 fordvictim

 
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Posted 25 January 2011 - 07:08 AM

well the lifter rattle and lack of oil flow was due to several collapsed lifters on this 5.7l vortec with 118 mi on it.

here's the situation, the new lifters in alldata says adj the lifters with the crank at tdc adj certian lifters then rotate crank 1 full turn to firing on no. 6 and adj the rest. they say adj till lash gone then go 1 more full turn. well I did this and the eng barely ran, when checked 4 cyls had no compression due to rockers being run down to far and holding valve open. another mech I know said to back off the rockers half to 3/4 of an turn , did this now have compression in all cyls and truck runs but no power and 1 lifter is tapping and getting a pop out left side of exh. (truck has true duals). I guess my question is what is the correct way to adj these lifters. can they be adj the old way with the eng running and loosen till clacking then 1 full turn 1/4 turn at a time or what does gm say the best procedure is?????

any help would be appreciated, all I'm trying to do is get this guy's truck back on the road.....

#2 dmullenax

 
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Posted 25 January 2011 - 07:36 AM

Every GM engine I've ever done was that way. I do the procedure step-by-step by the book and there's always some too tight and some too loose. So I started just skipping the book procedure and go straight to the, "warm-the-engine-up-back-em-off-til-they-clack-then-tighten-them-til-the-clack-goes-away-plus-another-full-turn" procedure.

#3 fordvictim

 
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Posted 25 January 2011 - 08:11 AM

Every GM engine I've ever done was that way. I do the procedure step-by-step by the book and there's always some too tight and some too loose. So I started just skipping the book procedure and go straight to the, "warm-the-engine-up-back-em-off-til-they-clack-then-tighten-them-til-the-clack-goes-away-plus-another-full-turn" procedure.



thanks I use that and see what happens, appreciate your help....

Dennis

#4 Karrpilot

 
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Posted 25 January 2011 - 10:00 PM

Am i correct in that the engine you are working on has roller lifters? Because i can not remember the last time i had a bad roller lifter. I think the last time i saw one was in a 1991 Ford Escort. And not only did this lifter collaspe, it took out the camshaft lobe it was on. The rest of the lifters and cam was ok.

Is that engine sludged up? Was it worked to death? We had a few in our fleet that chewed up the drive and driven gears on the distributor and cam shaft. The metal went thru the engines and ruined them.

The reason i am asking is me thinks there is more to it than a just a few bad lifters. As in the possibility something caused all of this. Metal in the oil? Camshaft going bad? But i thought that was a thing of the past with the Chevy small blocks, which had flat lifters.

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#5 Mike N

 
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Posted 28 January 2011 - 05:45 PM

Put the engine on #1 tdc. Adjust intake 1, 2, 5, 7, and exhaust 1, 3, 4, 8.

Rotate the crank 360 degrees (putting #6 on tdc) and adjust intake 3, 4, 6, 8, and exhaust 2, 5, 6, 7.

What I do is with the rocker obviously loose, I spin the pushrod as I tighten the rocker nut. When zero lash occurs, the pushrod will momentarily stop spinning. I then tighten the rocker nut an additional 1/4 - 1/2 turn.

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#6 fordvictim

 
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Posted 29 January 2011 - 11:05 AM

Am i correct in that the engine you are working on has roller lifters? Because i can not remember the last time i had a bad roller lifter. I think the last time i saw one was in a 1991 Ford Escort. And not only did this lifter collaspe, it took out the camshaft lobe it was on. The rest of the lifters and cam was ok.

Is that engine sludged up? Was it worked to death? We had a few in our fleet that chewed up the drive and driven gears on the distributor and cam shaft. The metal went thru the engines and ruined them.

The reason i am asking is me thinks there is more to it than a just a few bad lifters. As in the possibility something caused all of this. Metal in the oil? Camshaft going bad? But i thought that was a thing of the past with the Chevy small blocks, which had flat lifters.



yes roller lifters, no a well maintained truck , worked but not worked to death, and yes 5 of the lifters were collapsed, the lack of oil threw me....

the lifters were replaced and the eng ran but barely, a comp test showed no comp in 3 cyls. so I went back and did the old school adj on them, the thing that sucked was how much stuff had to be removed to access the valve covers, damn, removing the a/c comp to get the l/s cover off, geez.... but I adj them from clack to 1/2 turn 1/4 turn at a time.... then it ran better but poppin and spark knockin, I had to go to school on gm, found -24 deg timing, found that even getting the dist back in to the same position wasnt enough, so I had to adj the cam retard to 0 deg, truck ran a lot better but still had an intermittent miss.....

well as usual when you get so tech deep in a problem the simple stuff goes over the head.....well even though the cap is numbered I managed to reverse these 2 plug wires......


after all that the truck runs great except for a little lifter clatter on a cold start, I'm guessing the anti bleed down valve in the oil pump is stuck from running 20w50 oil cause the owner thought the engine was getting to many miles on it, well, that and the bottle of lucas he dumped in it to try to get rid of the clatter, on a cold engine, then didnt drive it.....

after 3 oil changes in a couple hundred miles I've got him back on 5w30, told him nothing heavier than 10w30 and I hope the cold start lifter rattle clears out soon.....


BTW, thanks for all the help guys, I was , a long time ago one of the orig administrators here, and I appreciate the help I get here.....

one lesson I'm taking away from this, I worked on fords for 25 years, and the little tech lessons you learn over a career are very important, you can really get brainfarted on the simplest stuff, when your not aware of it.....


I guess thats the price you pat for helping a friend, I would do it again in a second, life is all about learning the next lesson, this one was a doozie!!!!!


THANKS ALL.....

#7 Techniker

 
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Posted 29 January 2011 - 02:09 PM

Am i correct in that the engine you are working on has roller lifters? Because i can not remember the last time i had a bad roller lifter. I think the last time i saw one was in a 1991 Ford Escort. And not only did this lifter collaspe, it took out the camshaft lobe it was on. The rest of the lifters and cam was ok.

Is that engine sludged up? Was it worked to death? We had a few in our fleet that chewed up the drive and driven gears on the distributor and cam shaft. The metal went thru the engines and ruined them.

The reason i am asking is me thinks there is more to it than a just a few bad lifters. As in the possibility something caused all of this. Metal in the oil? Camshaft going bad? But i thought that was a thing of the past with the Chevy small blocks, which had flat lifters.


Flat tappets?! What century are we in?!

#8 Karrpilot

 
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Posted 30 January 2011 - 09:59 PM

One can have a 2000 Chevy 350 under the hood. But if somewhere down the line a 1970 Chevy 350 engine was swapped in, that would be a flat lifter engine.

Years ago, we got a 1979 351W engine from Jasper to put into a 1989 E-350 van. The 1979 engine had a 2 piece rear main seal. The 1989 had a one piece rear seal.

The point i was trying to make was parts can and do get swapped around.

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