In the last week the shop my dad works at has worked on a 3100 (105,xxx mi) and a 3400 (124,xxx mi) in a case were the bolt that holds the rocker down has pulled out of the head..due to the weak aluminum threads and pressure of the valve spring..

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3.1L|KN|GUTTED CAT.|DEER MOD|

Never heard of that, or seen it. Not sure how it could happen, unless at some point, the rockers were overtorqued. Since you have to pull the pushrods to do the LIM gasket, that is entirely plausible.

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One Big Ass Mistake America

im guessing just over time of the spring reacting against the rod that something has to give somewere...

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3.1L|KN|GUTTED CAT.|DEER MOD|

No. If that were the case, there'd be more cases of this, I'm sure. Even on the 60* boards, nobody has ever mentioned anything like this. I'm gonna go with overtightened rockers. They only take 25ft lb of torque, so overtightening would be easy.

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One Big Ass Mistake America

Itd be interesting to see if any more turn up, esp on same cylinder...

-- Wed Feb 24, 2010 9:18 pm --

well not on my car anyways

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Opinions are like assholes, Everybody has one and they all stink
3.1L|KN|GUTTED CAT.|DEER MOD|

Just a heads up, there's a tool available that makes those 3100 and 3400 LIM gasket jobs much easier: Lisle LIS48500 Push Rod Remover

The problem is beleived to be fr people not changing there oli frequently enough and sludge builds up in the lifters and causing them to not be as forgiving between the cam lobe and the rocker arm, which is graudually weaking the threads in the head causing the bolt to pull out

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3.1L|KN|GUTTED CAT.|DEER MOD|

I dont know the cause behind it but i have helicoiled and fixed LOT of 3400s with that prolem. My 05 Grand am gt did it just over 100k and i babied that car, ran nothing but synthetic oil changed every 5k. Snap on sells a drill bit and a tap just for those, its pretty easy to fix, although the backside of the block is a pain to get to if your doing it while still in the vehicle, but a big pry bar and a chain makes it a little easier.

hmm have not seen that just got done practicly rebuilding a 3400 from a montana after the owner let it over heat.... "only once"...... *cough*many times*cough

got the rocker cover off and the head was filled with this sludge that looked like caramel. so pulled the engine and cleaned it all out the LIM gasket went out and going into the intake runners and loosing coolant and was over heating. surprising ly the rocker stugs where fine even though the van had 153,000 miles

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92 LeBaron Convert: Turbo 3L 97 Grand Prix GT 4dr "Frankenstein": L67 4t65 swap
97 Grand Marquis: Summer DD 99 Grand Prix GTP: Top Swap Beater

that's what we ended up doin is puttin a helicoil in

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Opinions are like assholes, Everybody has one and they all stink
3.1L|KN|GUTTED CAT.|DEER MOD|

The helicoil holds up real good my grand am has 212k on it now and my mom drives it now. She hasn't had any issues since I gave it to her.

-- Mon Mar 01, 2010 10:12 am --

The helicoil holds up real good my grand am has 212k on it now and my mom drives it now. She hasn't had any issues since I gave it to her.

did it taste like carmel too?

Looks like camel toe...what?

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One Big Ass Mistake America

i was not that adventures to try and taist it

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92 LeBaron Convert: Turbo 3L 97 Grand Prix GT 4dr "Frankenstein": L67 4t65 swap
97 Grand Marquis: Summer DD 99 Grand Prix GTP: Top Swap Beater