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3100 SFI lifespan?


f_399

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i would definately take it to a GM affiliated place, like a dealership or specialist. I would not trust something that critical to a place like pepboys or midas...

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Symptoms- little bit of a rougher idle, loss of coolant, like listed above.

 

Most likely, at that many miles, there is a slight leak. Hell, probably all of our gaskets leak, it's to what extent is the case.

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rough idle, loss of coolant, etc etc.

 

 

Definitely dont go to the places mentioned above. Go to a mechanic that you trust in your area or if you are brave enough, do it yourself.

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rough idle, loss of coolant, etc etc.

 

 

Definitely dont go to the places mentioned above. Go to a mechanic that you trust in your area or if you are brave enough, do it yourself.

\

 

It's actually pretty straightforward to do yourself.

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rough idle, loss of coolant, etc etc.

 

 

Definitely dont go to the places mentioned above. Go to a mechanic that you trust in your area or if you are brave enough, do it yourself.

\

 

It's actually pretty straightforward to do yourself.

the toughest part is putting everything back the way you took it out, so you have to be prepared for that...labeling and such

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  • 3 weeks later...

My gaskets are fine and I have 107K miles on my 1994 3.1 olds cutlas supreme. I was going to pull the intake so I could replace the o-ring since I have the oil leak in the oil pump seal location. Should I not pull the intake and try to replace the o-ring by taking off the throttle body instead? I don't want to introduce a leak that I don't have yet. Anybody else do the o-ring repair and how bad was it?

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My 95 GP had just over 90k I think it was when It was sold and I never had the lower intake gasket leak. I did have the head gaskets blow and spun a bearing all before 80k. The head gasket went 3 weeks after I got the car too. :evil:

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My gaskets are fine and I have 107K miles on my 1994 3.1 olds cutlas supreme. I was going to pull the intake so I could replace the o-ring since I have the oil leak in the oil pump seal location. Should I not pull the intake and try to replace the o-ring by taking off the throttle body instead? I don't want to introduce a leak that I don't have yet. Anybody else do the o-ring repair and how bad was it?

 

Umm.. I've removed the throttle body on my 3100 (to get at the t-stat) and I don't see how you would be able to do anything for the leak. The TB is just connected to the side of the plenum. Maybe I'm wrong I dunno :shrug:

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Has anyone done a generic write up on replacing the LIM gaskets?

 

I have 138,XXX on mine and have noticed a leak is starting...would love to attempt to change them.

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150K miles on the 95 Cutty w/ 3100 SFI and no problems with gaskets. Engines reliable as hell.

 

thats good to hear, i am almost at 150K

 

what causes the failure? maintenance? pushing engine too hard? Oil??

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150K miles on the 95 Cutty w/ 3100 SFI and no problems with gaskets. Engines reliable as hell.

 

thats good to hear, i am almost at 150K

 

what causes the failure? maintenance? pushing engine too hard? Oil??

 

on either end of both LIM gaskets there is a lot of pressure exerted on the plastic of the gasket. Over time the gasket will crack at these stress points causing a leak. No it does not happen to every single 60v6 pushrod however it is very common to happen.

 

In 2002 GM released a revised gasket desgin with a beefier rubber seal and stainless steel tabs inserted where the stress points are to reinforce the gasket. Along with this they released a revised installation spec that requires the use of revised LIM bolts that have a powdertype threadlocker on them and require a different torque spec than before.

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