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Old 03-22-2015, 10:58 PM   #11
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Originally Posted by chevy82 View Post
It can be saved if done right. I would try a heli-coil repair or gm has a thread repair kit that comes with timeserts (Dealer item only) . I would try this first before replacing the head, but to each his own though.
Timesert makes two kits for GM 3100/3400 V6. A 10mm & a 8mm bolt thread kit. My 99 Chevy Lumina 3100 Vin M used 10mm rocker arm bolts. Google the Thread Doctor. Lisle makes an upgraded pushrod removal tool part# 48300. The only correct way to loosen the rocker arm bolts on these GM 60* V6 without using the fore mentioned tool, is to turn the crankshaft in order to make sure each cylinders valves are not being opened, or at TDC on the compression stroke. The reason is that if the cam is trying to open the valves, then the rocker arm bolts threads in the aluminum head are in tension....... High loading, thus you strip out the threads in the head, when they are loosened. Youtube is replete with videos of knocking 3100/3400 engines. ������
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Old 03-05-2017, 10:15 AM   #12
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Originally Posted by Tech II View Post
You should put those push rods back in the original positions......if mixed up, the exhaust push rods are longer than the intakes.......you can easily look into the head to see if the rod is going to an intake valve....
rocker arms
Hello, my question is on an 05 Monte Carlo 3400 do the Rocker arms need to go back in the same order they were taken off ?
reason being grandson moved them around and they are not in the same order
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Old 03-05-2017, 08:23 PM   #13
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rocker arms
Hello, my question is on an 05 Monte Carlo 3400 do the Rocker arms need to go back in the same order they were taken off ?
reason being grandson moved them around and they are not in the same order
Ideally you should place them back in the same position, but they should be ok put in any position. Be mindful of not stripping the rocker arm bolt hole threads in the aluminum heads! Buy the tool mentioned in my reply. Otherwise make certain that each cylinder is on its TDC of its compression stroke....... both valves closed. That way there is no loading on the rocker arm bolt/threads in the aluminum head, due to the valves being open! ����
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Old 03-05-2017, 08:26 PM   #14
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Oh.....the pushrods are of different lengths! Do nt mix up in the wrong position! ��
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Old 08-24-2017, 03:15 PM   #15
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Originally Posted by Focke-Wulf190 View Post
Timesert makes two kits for GM 3100/3400 V6. A 10mm & a 8mm bolt thread kit. My 99 Chevy Lumina 3100 Vin M used 10mm rocker arm bolts. Google the Thread Doctor. Lisle makes an upgraded pushrod removal tool part# 48300. The only correct way to loosen the rocker arm bolts on these GM 60* V6 without using the fore mentioned tool, is to turn the crankshaft in order to make sure each cylinders valves are not being opened, or at TDC on the compression stroke. The reason is that if the cam is trying to open the valves, then the rocker arm bolts threads in the aluminum head are in tension....... High loading, thus you strip out the threads in the head, when they are loosened. Youtube is replete with videos of knocking 3100/3400 engines. ������
So you would use the tool to remove the pushrods first, then it is safe to loosen the rocker bolts?
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