See procedure below for 3.1L and 3.4L in many Chevy, Buick, Pontiac and Oldsmobile models. Malibu,Classic, Lumina, Alero, Regal, Century, Grand Prix, Grand Am, Montana, Transport, Venture van, Silhouette, etc.
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1999 Pontiac 3.4 V6 3400. Question:Top of motor tore down for oil getting in coolant. Gaskets. Found bad at coolantjackets. To replace intake gaskets what is the procedure for installing correct length push rods inthe right spot and valve adjustment after taking push rods out of way to get gaskets. I am formergm tech years ago, now heavy truck.
Thank you for the generous Tip / Donation. Answer:There is no special valve adjustments on this motor as was the case with the older Chevy smallblock. Rocker arms are just torqued to specs. The most important thing is that the push rods areinstalled correctly. They are different lengths. GM recommends new lower intake bolts, and haveupdated the torque specs on the rocker arms and lower intake bolts.
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The intake and exhaust rocker / Pushrods are labeled in the picture below.Exhaust pushrods are longer than intake. Intake valves are closer to the valley of the engine.
Torque spec on rocker arms is:14 NM (124 in.lbs.) plus 30 degreesLower intake bolts:long bolts- 13 NM (115 in. lbs.)Short Bolts- 25 NM (18 FT. lbs.)
1- Exhaust rods (Longer) are in this position2- Intake rods (Shorter) are in this position
Tip / Donation
Bolt part numbers11588914 long11588915 short
No compression on 3.4 V6 Aztec, replaced one cylinder head only but did remove push rods etcfrom both to replace gaskets, also turned the engine over without push rods good compression,left overnight still no compression any one have any ideas I am stumped. Lifters? Sound like you have the push rods in the wrong order.Check them again using picture above.
I"m working on a 3.4l but when i tighten the rockers i have no compression and i have push tubein the order they should be can my lifters be bad this car set for awhile Sitting for a long time will absolutely cause the lifters tobe very hard to pump up. Either they will need to bereplaced, or you can run the engine for a while to see ifthey will. Running too long though can cause otherengine damage.
When u open a valve cover to a 3.1 v6 on an olds cutlass? Were the rocker arms supposed tobe loose? Well, no they should not be loose. If they are the rockerarm studs may have pulled the threads out of thecylinder head. If that happened you would need to drilltap and using Helli-Coil to repair.
I just completed this job, and after assembly car worked and ran fine. Made atest drive of 3-5 miles, Axel from stop as well as while moving. Drove car backhome, idled for a few means, then drove a longer distance. After maybe 5miles, stopped at a red light, and noticed what sounded like valves tapping,then upon pressing the gas to accelerate, car seemed to lose power and"check engine" light started blinking. Is it possible the rocker arm bolts couldhave been improperly torqued? Yes, this sounds like at least one of the rocker studs haspulled its treads out of the cylinder head. This is causinga misfire, thus the blinking check engine light. I wouldsuspect it is the one or more that were improperlytorqued. There is a repair kit to fix this. It comes with adrill, tap and dye, and insert.
Had a rattle noise in my 3.4l engine, misfiring on #4 cylinder, removed the valve cover found thatthe treads are stripped out of the head, do you think a Hellicoil will be strong enough to repair. Yes, a thread repair kit will do the trick and will actuallybe stronger than the factory setup. Just make sure whenyou drill and tap for the Helicoil, that is it absolutelystraight with the original hole. You don"t to be off anywhen dealing with a rocker arm and valve traincomponents. Use some red Loctite on the threads of theinsert before you screw it into place.
while replacing my push rods I mistakenly placed an exhaust rods in an intake rods place.. Inoticed while tightening (with 3/8" ratchet)A distinct noise and bent the push rod. IS there a wayto know if I bent the valve or cracked the piston without removing the head again? If you did not start the vehicle, you"re probably ok andjust bent the push rod. I would install a new correct sizepush rod, and after getting everything tightened backdown, turn the motor over by hand to make sure there isnothing damaged and no interference.
I just installed a rebuilt head and when I tighten down the #3 an #5 on the 3.4 I can see the intakevalve open which gives me no compression when I check it with air. We don"t know why so theirsending me another head for my old head when put back on doesn"t open the valve thePushrods are correct the torque is proper an ideas why? Some of the valves opening when you tighten down therockers is normal. Which ones that open depends on theposition of the camshaft. The part that does not makesense is that they did not do this after re-installing theold cylinder head.
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I did the same thing that an earlier poster did in that I torqued the push rod bolt to 124 FOOTlbs. stripping the cylinder head. You commented saying that there was a repair kit to fix this???Where could I find this repair kit? Thanks The thread repair kit can be found at any local parts store.