Thread pitch on the rocker arm bolts?

[Xkxbug04]

1 of mine appears to be stripped and not allowing the rocker to seat all the way. I was curious about retapping it?

[Syndicated]

If its worn down to the point you can't seat the arm with the nut, I'd say the stud is screwed.
You can't run a die over metal that isn't there!

[JerryRigg]

You can, however helicoil it, perhaps that's what he meant.

If they're the 10mm studs they are M10x1.5 - just had to helicoil one rocker stud on my friend's '96 3100 with the roller rockers. I've no idea what it is if it's the 8mm studs

[cavalier3400z]

I just did 2 8mm rockers on my 3500 head. Stripped completely removing them.


Sent from my iPad using Tapatalk HD

[Xkxbug04]

Ok guys what's my options here then? The bolt heads are 10mm from what I can remember..

So that makes them a m10x1.5 thread pitch?

[Xkxbug04]

Car runs & Idles fine, just seems to run on 5cyl since 1 is messed up. It also has enough power to move ou of its own way, but obviously not full power. It's deffinetely the rocker. What's my solution? Anyone local to 92395 that would wanna help a learning lad out?

[TurboGTU]

take the rocker to the hardware store and have them measure the thread and get the helicoil kit.

[Xkxbug04]

take the rocker to the hardware store and have them measure the thread and get the helicoil kit.

Ok and I'd have to drill out the mount of the Head & tap it for the heli coil right?
I'm gonna try to just retap it tomorrow and see what happens, if it don't work ill do the heli coil I guess.

[Xkxbug04]

Simple retap fixed my issue.

Now the belt tensioner snapped so another 40 bucks there. However the car threw a p0300, and the check engine light is blinking. It's definitely got a miss and it sounds like its directly center of the upper intake? What the hell could it be?

I pulled the Plugs & cleaned them up, regapped at .040 vs .045 that they were. Nice strong spark. Wires in the correct order. I'd hate to get rid of this car but its headed that way very very ii key right now.

[trotterlg]

I doubt the re-tap fixed it, bet it is pulled out again now. Drill it out and put a helicoil in it and fix it right and things will be good. Larry

[Xkxbug04]

I doubt the re-tap fixed it, bet it is pulled out again now. Drill it out and put a helicoil in it and fix it right and things will be good. Larry

Wrong, pulled the valve cover already held the same torque setting I already had which was 17ftlbs. This is with 22 miles of intown driving.
It moves along fine now, just has the nasty misfire, runs and drives fine. Has that knock/popping noise under the intake manifold. Not under a valve cover.

[trotterlg]

Are you positive that the stud is not pulled out of the head? The rocker arm can be torqued down and the stud still pulled out if you have 10mm studs in the head with 8mm bolts holding the rockers. Larry

[Xkxbug04]

Are you positive that the stud is not pulled out of the head? The rocker arm can be torqued down and the stud still pulled out if you have 10mm studs in the head with 8mm bolts holding the rockers. Larry

Motors a 97 3100 from a malibu. It's only got a bolt holding it on, not a bolt/stud. It's a single 10mm bolt though the rocker. M1.0x1.5 thread pitch. It's deffinetely held on correctly. And again the sound is not coming from the rocker, I ran it with the valve cover off and checked it all. As well as used a stethoscope to pinpoint where the sound was located.
Again that's under the intake manifold. Not by the rockers?

[trotterlg]

There is nothing under the LIM other than the cam and lifters. If it is making noise under the intake then it is from a lifter or the cam and lifter. These cams have pressed on lobes and are known to be bad actors for breaking, but your cam is not broken, so it could be a bad lifter or a bad cam lobe, either way one of the valves should have a lot of play in it not being taken up by the hydrolic lifter. It may feel tight when the valve is open but have a lot of slack when the valve is closed. Bummer either way. Mine is out of an 96 Olds, only slightly different than the one you have, but mine has studs for the rockers. I guess the plastic guide that keeps the roller lifters straight could have failed on one of the lifters and let it rotate in the bore, that would make a mess. Larry

[Xkxbug04]

There is nothing under the LIM other than the cam and lifters. If it is making noise under the intake then it is from a lifter or the cam and lifter. These cams have pressed on lobes and are known to be bad actors for breaking, but your cam is not broken, so it could be a bad lifter or a bad cam lobe, either way one of the valves should have a lot of play in it not being taken up by the hydrolic lifter. It may feel tight when the valve is open but have a lot of slack when the valve is closed. Bummer either way. Mine is out of an 96 Olds, only slightly different than the one you have, but mine has studs for the rockers. I guess the plastic guide that keeps the roller lifters straight could have failed on one of the lifters and let it rotate in the bore, that would make a mess. Larry

Ill grab a video in the next few days so you can get a feel for the sound. It's not loud like valve train noise or loud like a collapsed lifter or something. Idk ill get a video and get the codes read in the next few days and see what happens from there.