hyd valve lash

[blown54]

Jay i was helping a freind out today with his 440 mopar and his lifters sounded like a flat tappet with the nuts lose.The cam is a comp 292H i beleive the lifters are from comp also i am not sure as he had someone else build the motor last year.anyways i had him roll the motor over some to prime the lifters and when i went to adjust them some lifters you could push down the rockers with very ease and others would not move at all.I allways used to set hyd cams at 1/2 turn after contact but this one has got me stumped as the plungers in the lifters would not pump up.when the motor was first put together it made a little noise but just recent it has gotten very loud.Also when he rolled the motor over it wasn't pushing any oil up to the rockers but it would should pressure on the gage.I am thinking the lifters could have went bad or there is an oiling problem?any ideas:confused:

Jeff

[Ed-vancedEngines]

I hope it has not spun a cam bearing. Mopars use a timed upper end lubrication system. Also the use I am thinking 3, or is it 4 bolts that hold the rocker stands that are cut away to allow oil to flow. Might want to check to see if the correct bolts have been installed in it. Mopar engines can have tons of oil pressure and be getting none to some of the lifters or to the valve train. The camshaft has two intersecting holes in it that the upper end lubrication flows through. If the cam bearing is turned the holes will not line up and will not feed that hole. Also the same with those bolts. If they are out of place the oil will not pass through into the rocker shaft.

Jay may tell you different but I like to set my pre-load with hydraulics so the pushrod seat in the lifter is in the center of travel. Usually with aftermarket lifters that will be 1/2 turn. With serious prepared for racing hydraulic lifters from either Morel or from Allen Sherman the pre-load will be different. With Comp you should be safe at 1/2 turn after zero lash.

Hope this helps some.
Ed

[blown54]

thanks Ed maybe the bolt thing has something to do with some lifters are pumped up and others are not.This motor also has edelbrock heads if that makes a difference.

[Ed-vancedEngines]

It will still oil the same way unless that is modified to oil from the back with an external line. Pull the rockers and also look at the oiling holes in the rocker shafts. The holes should be pointing in the direction of the exhaust. That can cause problems too if the shaft oiling holes are pointing wrong.

With rockers and shafts off look inside the rocker stands and find the stands that have a hole going through them into the head. Thos are oling holes that supply the oil to the valvetrain. Those holes should have only bolts with an oil relief built into them.

I am getting ready later tonight to remove a set of rockers from a 440. So I will tell you ust which holes are to supply oil by either late tonight or tommorrow sometime. I have to do a spring change in the car and reset the installed ht so it will alll be off. I may not finish it tonight.
Ed

This one has the T&D system which I highly do recommend. I will take a few pics if I see something that might be of help for you.

[blown54]

this motor has the crain gold shaft mounts.the motor was built by Dean Nactopolis.i guess hes suposed to be a guru with mopars but this thing just doesn't sound right and the guy with the car can't get ahold of him so i am trying to help him out.

[Ed-vancedEngines]

You will be lucky if the rocker arms are not already ruined. The gold Crane shaft mounts are in my opinion garbage. I say this because of having lots of problems with them in Mopars nothing else. For other applications they are fine but not for Mopar. They will work with hydraulic spring pressures in Mopars though. but will fail big time with solid roller pressures.

Take the rockers off the shafts and look and feel inside where the shaft goes through for signs of heat or torn metal from lack of lubrication. If you find any gaulding they are trashed. Also check the shaft to see if it is smooth and has no rough places on it.

If the lack of lubrication has gotten to the rockers or shafts enough to damage them you better also replace the valve springs too. They will get brittle with lack of lubrication.

I am beginng to wonder just what kind of Mopar Guhru that guy is anyhow.

Now back to work. lol
Ed

[Jay Allen]

The preload at 1/2 turn at zero lash is good bet. That Comp lobe is a noisey lobe and may require 3/4 of a turn. The problem is my zero lash and your zero lash are all different.

Plus getting a MOPAR to oil properly. Whoa boy.

If it were me Jeff, I'd pull the manifold. Take the lifters apart and bleed the oil out. Then put them back in. Turn the engine by hand and set the valves. Fire it up and see what'cha got.

Hope this helps Jeff.

[Ed-vancedEngines]

http://i22.photobucket.com/albums/b327/Ed-vancedEngines/Repair%20Tech/PatsNissanRepair030.jpgThis is what the stud or bolt going through the rocker stand should look similar to. The cut-away is how the oil gets into the rocker shaft. There should be either a stud or bolt like this on the #2 and # 4 rocker stand. Oil comes up through those two stands.

http://i22.photobucket.com/albums/b327/Ed-vancedEngines/Repair%20Tech/PatsNissanRepair029.jpg

[Ed-vancedEngines]

O'boy.
Didn't intend for these to be so big but maybe you can see better what I was talking about. If you look you can see the oil hole going through the rocker stand.
Ed

[blown54]

Thanks guys,oh boy hes not going to be happy when i tell him this.He paid over $8000 to have this motor built!i apprectiate the advice as i have never messed with mopars,sounds like i don't want to start either.I will let you guys know what i find out if he wants me to go further on it.I think the best bet is to let the guy who built the motor fix it!

Jeff

[blown54]

I been busy with work so my dad went over there to help him out.so my dad checked it out and called comp cams and found that the cam is wiped out!the guy at comp said something about breaking in the cam with the wrong oil?I guess they broke it in with full synthetic oil,the guy at comp said something about using Desiel oil?

[Rick_R]

Back in the day before catalytic converters there were zinc dialkyldithiophosphate antiwear compounds in oil. These withstand extreme pressure, but are not cat freindly. They have all but been phased out of gasoline engine oils thanks to the EPA. No big issue for new cars with roller cams and new piston alloys....but for hot rodders it means a lot of wiped out cams. there are basically 2 alternatives, you can run a good 15W40 deisel oil, like shell rotella, or you can add some GM EOS addative that contains zinc. you may be able to find some other oil addaitives at you r favorite parts store, just check the label for zinc dialkyldithiophosphate.