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......
-
Welcome to The Truck Stop! We see you haven't REGISTERED yet.
Your truck knowledge is missing!
- Registration is FREE , all we need is your birthday and email. (We don't share ANY data with ANYONE)
- We have tons of knowledge here for your diesel truck!
- Post your own topics and reply to existing threads to help others out!
- NO ADS! The site is fully functional and ad free!
Problems registering? Click here to contact us!
Already registered, but need a PASSWORD RESET? CLICK HERE TO RESET YOUR PASSWORD!
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….
dbrannon79
I'm getting there!
I would second that notion.. need to flush out the block and check the other freeze plugs. I believe I saw those on RA. installing pipe plugs might end up contacting the intake not allowing it to sit on the heads properly. If you do that, I would go with the allan head pipe plugs so they will sit flush in the head. I will look on RA and see if I can find those freeze plugs.
side note: there are no freeze plugs on the back of the block so if you do need to replace them all, just remove the exhaust manifolds an you can access the side plugs. you will need to lift the engine and pull the engine mount saddles off the block too. but you won't need to pull the engine.
side note: there are no freeze plugs on the back of the block so if you do need to replace them all, just remove the exhaust manifolds an you can access the side plugs. you will need to lift the engine and pull the engine mount saddles off the block too. but you won't need to pull the engine.
dbrannon79
I'm getting there!
I looked on RA but didn't find them. but I did search and found this post showing them as dorman # 555-003 measure them and see if they aren't 7/16"
@Twisted Steel Performance will know exactly what size they are. he may also have a set available too.
@Twisted Steel Performance will know exactly what size they are. he may also have a set available too.