GM 3 4 LITER MISFIRE 

I have three of those engines in my shop. Not my favorite design

Hi James... thanks for the huge shout-out! The glasses will take some getting used to (tilting head enough to record stuff when looking down). Video & Audio quality can be adjusted via the "settings" text file when you boot up the glasses. Video quality can obviously not be compared with what camcorders can do... but I'm sure that in the future, quality will improve (might have a 4k version at some point). I probably turned the "beeper" off during the time that I was testing them. The user manual will explain how to turn everything on / off and how the settings are adjusted. I find the glasses handy because I don't have to worry about repositioning a camera constantly. If all you end up doing is using them for fishing, that's fine too! =) The baby stickers were made because of my loud exhaust: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-RHuuE_VqDBU.html For those that don't want to type the link: goo.gl/N5CgSi

I've found when having to drill out holes inside an engine where metal shavings can destroy lives, a small paper cup, some contact cement and a bit of silly putty can work well to contain the shrapnel! Use the silly putty to fill in any holes and/or make yourself a flat surface, then use contact cement in very small quantities to adhere the paper cup to the surface. Make sure to pre-punch a hole in the cup, though! :D

me: Replace head with a salvaged one... Heads off to a machine shop while I'm changing the timing components. Shortcuts to save money usually burn you with comebacks. This engine already has a history of shortcuts. Tear it down.

hey james this is a 2 thumbs vid one for the vid and another for Thomas exovcds for the glasses.....just a note here; if you ever mix up the intake and exhause push rods and start the vehicle YOU WILL BEND VALVES!!! 100%.....good repair vid james!!!

Great Video. The 3.4's came with both sized bolts in different years. I have done a lot of 3.4 work in vans. I have a thing for doing heads on 3.4's I just love it for some reason. When I go get a set of heads at the junk yard I always have to check to make sure which size rockers they have and it if they are different than the ones I pulled. Those rockers striping out aren't and unusual occurrence especially on the 10mm heads. The old trick is that the heilicoil tap for the 8mm will fit in the stripped 10mm hole with little or no drilling and then you put a 8mm rocker on it. But your 8mm one doesn't look like it was heilicoiled before. A common reason for them to strip and break is because someone put the push rods in backwards (intake and exhaust) check them and make sure they are not bent ad they are in right. The exhausts are 1/4 inch longer. Someone probably did heads on it before and got those two mixed up and then did a repair on it.

10.20.18. The 3.1/3.4 L GM V-6 engines have issues with the aluminum threads in the head stripping out the rocker arm bolts, usually after the L.I.M. Gaskets or head gaskets are serviced.....Due to not using a Lisle 48300 pushrod removal tool while removing the rocker arms when changing the L.I.M. Gaskets. If you don’t use the Lisle 48300 tool you have to make certain that before you loosen the rocker arm bolts, each cylinder must be at TDC on their compression stroke so that the rocker arm is not trying to open its corresponding valve. You must remember that it’s a fulcrum action......thus putting tension on the rocker arm bolt/thread in the aluminum head junction! .....When the cam/lifter is trying to open its valve......Also TimeCert’s ™️ make a kit to repair these that are superior to Heilicoil’s ™️❗️🚗

Fantastic job Danner. I hate inserts. You did an excellent job using both the camera and glasses. Thomas is a great guy and I've watched quite a few of his videos. Looking forward to more videos with either the glasses or camera. Thanks!

most all the remanufactured heads are drilled and tapped to 10MM bolts, they call it an upgrade. I call it fudge, because the head material was (*^*&$#&# junk :))

Thomas EXOVCDS is a cool dude! helped me with viewers starting my channel, been a sub to him for a long time. Once a month, around the first, on the weekend! he does a live stream on google hangouts, bet he would love to have you on! as would I :) as I normally participate

s)Nice video James. Quite an interesting fix. Your new glasses were ok but the picture is like ( welcome back to 1970s) and the sound was a bit low.However i am sure after some adjustments it will be fine.

So different like Paul do, like both, of engine troubleshooting and electricity, ...keep cool! Good job make time.

I'm wondering if the broken pieces got caught in the valve's spring. That may prevent the valve spring from fully compressing, and the bind would let the pushrod strip out the threads or break the rocker, as it's going to continue pushing up on it's end, regardless of whether the valve is able to move any more.

Glad to see a Danner not scared to get dirty lol. No but it is great that you both do videos as you each have your unique way of handling problems and getting them fixed. Thanks for all you do I hope to be able to meet both of you one day as always enjoy meeting fellow techs that want to do their best

Very nice. Real world auto repair. Thanks for sharing.

the broken piece jammed under the spring or rocker and ripped out the threads. the pushrods and lifters may not be "no bueno" now :)

I get to wondering why these threads strip. I think a lot of the time it is maybe the vehicle has set for a while and the gas goes bad and does not lubricate the valve as good as fresh gas and it makes the valves stick.

Well you did something i wood not want to do is drill holes in head my luck not be straight keep up the good work

Reallly liked the video. U guys keep it real! Clark seems much easier with the filming. Where is Nick? Can u open anymore drawers on the box? I had one tip over on me. Real life repair!

30 pounds only works for tire pressure! HAHA

definitely a interesting problem. great job on the repair.

That's my life story, " where's my other rocker at?" Or what ever else I had in my hand 2 minutes ago.

Seen a 3.4 with a broken cam shaft had a cylinder Bill 300 psi and install the engine because the pulled out Stud on ext could've let pressures get so high that the intake valve could not open and shatter the rocker

That was a real nice thing to do Thomas. Have seen those things fail many times, James. I wonder if too loose rather than too tight is the cause. I have seen those rockers actually move slightly at the base with the engine running and have found the bolts loose. Don't know why they changed to the smaller bolts. Must have been cheaper to manufacture.

Pretty cool video man!!! those glasses rock...the audio ..not so much....this is a great video.....thanks!.

lmao @ 47:36 comical and on par with what I'd be say

Its always the back head that this happens to as well. Gotta love it!

Nice Video James keep them coming.

Nice job James. I started laughing thinking he's not going to keep recording trying to get that push rod. Nice video.

WHERES NICK!!!!!!

Hey jimmy give me a good old 350 chevy anyday dump that new junk.

james gota love the three valve

james also my tool box is just as messy so do feel bad lol

Good ol HF compression gauge. Had mine for 10 + years.

That was a job well done ! Just wondering how you go about informing/charging the customer for this? Charge up until the compression test an initial diagnostic fee and then more for going deeper to find the actual cause for the low compression ? And then inform then that repair may not be a permanent fix? My friend recently overheated his 4.7 jeep which lead to zero compression between two cylinder along with a smashed spark plug in one. Car wouldnt run and at that point I said to let it go lol

just had a van with the same issue with pulling threads in 4 different rockers. helicoil worked on 2 of them but kept pulling ghee helicoil out of the others so i used a better thread cert called "big cert" that was the only thing that fixed it. i researched and found its common..something to do with the heads metallurgy or something, also noticed newer head designs used the larger 10mm bolt s

That was cool.

Awesome James. Your going to catch up to Paul on subs. Lol Hopefully you can shoot more great repairs. Try to do more non communication with a labscope on the dlc or whatever method you use

James I found your channel through Paul, and though you do videos different they are very informative which is what counts the most. Great job on the diag and repair. Keep up the good work, brother.

What was the brand of those inserts and where did you get them? Thanks

i find it a lot easier to use electric drill for that type of work

the only thing about the glasses is the thing doesnt pick up sound very good at all

That was a real life repair! What a PIA! Time will tell how it holds up. Take it easy James

im 1st lol