Calling all L36 Owners, need your help.
#21
DINOSAURUS BOOSTUS
Expert Gearhead
Ben... the PTFE stuff is the GM suggested goop. Looks like MAC'* permatex goop is also a good version, I'd assume most RTV'* would do the job as well.
There actually isn't any pressure where the bolts enter the oil passages, it'* merely a wicking effect.
Toasty and I swapped his upper intake and lower gaskets the other week. I think the whole procedure took about 3-4 hours.
Big things are, remember the EGR tubes crack easily and remove both the LIM and EGR ends to ensure it moves easily.
The TB bracket is a stupid design. 8mm ratcheting wrench or simply pry counter clockwise once unbolted from TB.
Don't forget the two bolts in the lower intake.
If the intake is full of coolant/goop, either use a rag or shop vac to soak it up or it'll end up going into the engine.
This your first L36 Thomas?
There actually isn't any pressure where the bolts enter the oil passages, it'* merely a wicking effect.
Toasty and I swapped his upper intake and lower gaskets the other week. I think the whole procedure took about 3-4 hours.
Big things are, remember the EGR tubes crack easily and remove both the LIM and EGR ends to ensure it moves easily.
The TB bracket is a stupid design. 8mm ratcheting wrench or simply pry counter clockwise once unbolted from TB.
Don't forget the two bolts in the lower intake.
If the intake is full of coolant/goop, either use a rag or shop vac to soak it up or it'll end up going into the engine.
This your first L36 Thomas?
#22
Senior Member
True Car Nut
Originally Posted by BillBoost37
remember the EGR tubes crack easily and remove both the LIM and EGR ends to ensure it moves easily.
#23
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Originally Posted by MACDRIVE
I had the exact same occurrence. These engines have such excellent oil pressure, that they force the oil up the bolt threads. I pulled the bolts out that had a puddle of oil around them and coated them with Permatex 2B. Reinstalled them and a year later, still a dry LIM as you can see. The bolt I'm using in the pic is just a common hardware bolt for display purposes.
Very good.
#24
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Keep in mind that as the LIM gaskets erode in DEX, COOLANT will come up those bolt threads as well. So sealing the threads just in the block may prevent oil wicking, but it won't prevent coolant wicking as the gaskets deteriorate.
We don't know how the new LIM gaskets hold up long-term yet, but we assume they're far better.
We don't know how the new LIM gaskets hold up long-term yet, but we assume they're far better.
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I just looked at my 98 LeSabre, and sure enough there is oil on top of the manifold around the LIM bolts, suggesting I have this wicking thing, too.
I'll be doing LIM gaskets on this sucker soon. I must say though, I'd be a bit leery about the effect on proper torque-ing of the bolts if using RTV on the threads...do you think that generous use of blue threadlocker would have the same wick-prevention effect?
What about using blue threadlocker on the threads, and RTV on the smooth part of the bolt (to seal the gap between the LIM through-hole and the bolt shaft)?
I'll be doing LIM gaskets on this sucker soon. I must say though, I'd be a bit leery about the effect on proper torque-ing of the bolts if using RTV on the threads...do you think that generous use of blue threadlocker would have the same wick-prevention effect?
What about using blue threadlocker on the threads, and RTV on the smooth part of the bolt (to seal the gap between the LIM through-hole and the bolt shaft)?
#26
DINOSAURUS BOOSTUS
Expert Gearhead
Following the FSM procedure should send us in the right direction. (Honestly..I haven't read it through yet)
If it says blue locktite, then use that.
If it says the pipe sealant, they use that.
Personally. I've never heard or seen an intake bolt loosen up when locktite wasn't used. I've seen then wick though.
If it says blue locktite, then use that.
If it says the pipe sealant, they use that.
Personally. I've never heard or seen an intake bolt loosen up when locktite wasn't used. I've seen then wick though.
#28
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Originally Posted by BillBoost37
Personally. I've never heard or seen an intake bolt loosen up when locktite wasn't used. I've seen then wick though.
#29
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Originally Posted by bill buttermore
Originally Posted by BillBoost37
Personally. I've never heard or seen an intake bolt loosen up when locktite wasn't used. I've seen then wick though.
I know that the GM PTFE adheisive, the grey stuff, its not effected by oil & gas, it would hold the bolts.
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Originally Posted by agrazela
I'll be doing LIM gaskets on this sucker soon. I must say though, I'd be a bit leery about the effect on proper torque-ing of the bolts if using RTV on the threads...do you think that generous use of blue threadlocker would have the same wick-prevention effect?
I don't think it will upset the torque value; if anything, it might cause a slight increase in torque, but not as much as oil would.