Help, my engine just started making a loud audible popping loudly right before I pulled into my driveway a few minutes ago. I removed the filter and had my neighbor start the truck and I put my hand in front of the turbo and could feel it popping air backward out of the intake. It seems like only 1 cylinder is doing it. I think that it could be a broken valve spring and it's pushing all of the compression back out (large cylinder of air being forced through a small hole = pop!). What do you guys think?

 

quit running the motor and pull the valve covers to see what you can see

 

Yeah, I didn't run the engine any more than I had to. Pulling valve covers is my 1st step, doing so right now. Stand by.

 

Interesting to see what it is...

 

Cam gear jumped...

 

Madhat, that was my other guess, but like I said it sounds like it's only 1 cylinder. I have the VCs off and don't immediately see the issue, but I'm currently loosening the lash adjusters because i know that a broken spring is often difficult to see. I will check that next if I don't get anywhere with the VC's removed.

Is the gear just a press fit on the cam, or is there a key?

 

hang in there buddy....think minor repair for now

 

Well my prayers were answered. The lash adjuster on the intake valve of cylinder #5 came loose, backed off, and allowed the push rod to rest on the rocker itself instead of on the ball joint. I have some spare push rods sitting here, but since it's cylinder #5 you can't get it out because the cowl is in the way, so I was praying it wasn't bent, and somehow it wasn't! I did a valve adjustment while I was in there (kinda had to because I loosened them all) and put it back together and it runs like a champ!

Thanks all for the rapid replies!

 

They come out. There's a plastic plug above #5 and #6, take the plug out and the push rods will go up into that area and you can take them out that way.

 

What he said, and I'm glad it wasn't the whole valve train...

 

Congrats man!......glad you kept thinking minor repair

 

Good news!
Learn something everyday!