So I pulled the intake on my 6.2 to replace all rubber fuel hoses....there 8 1/2in plugs 4 on each head just under the intake...looked like 2 were leaking just a tad....hit them with the air hose and poof, gone....Anyone ever changed them ? Not fun ! 18 new cuss words came to me and I still have to put the intake back on.....if you are loosing some coolant, might want to look under the intake......
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1990 C3500 6.2 1/2inch freeze plugs
- Thread starter nitrojim
- Start date
MrMarty51
Well-Known Member
Thats the first I have heard of loosing coolant through those plugs.
With those plugs pulled, the holes can be reamed and threaded then those Lock-N-Stitch cracked head sleeves inserted and sealed down.
With those plugs pulled, the holes can be reamed and threaded then those Lock-N-Stitch cracked head sleeves inserted and sealed down.
MrMarty51
Well-Known Member
I searched around looking for the Lock N Stitch website that sells the cracked cylinder head repair kits but could not find it.
Anyone else have a problem finding that site ?
Anyone else have a problem finding that site ?
Will L.
Well-Known Member
That is uncommon- super uncommon.
Imo remove the block lower drain plugs and flush that engine and radiator. For those to fail - i would suspect the regular freeze plugs will fail soon also.
The thing Marty is referring to is NOT lock&stitch.
It’s a repair for the steam pockets- which those plug up. There is a YouTube video of a guy showing how to do it. 10mm drill bit and brass sleeve - or close to that size. You have to tap the holes for 1/8” npt to plug them up afterwards.
Check out TwistedSteelPerformance for what he did with those taped out plug holes….
Imo remove the block lower drain plugs and flush that engine and radiator. For those to fail - i would suspect the regular freeze plugs will fail soon also.
The thing Marty is referring to is NOT lock&stitch.
It’s a repair for the steam pockets- which those plug up. There is a YouTube video of a guy showing how to do it. 10mm drill bit and brass sleeve - or close to that size. You have to tap the holes for 1/8” npt to plug them up afterwards.
Check out TwistedSteelPerformance for what he did with those taped out plug holes….