The right tool for the right job.
Coasty



"L.W. ("ßill") ------ III" <----------@***.net> wrote in message
news:43AB93E8.49C735DA@***.net...
> Preparation is the key to any job. Always take a knife to scrape
> the little ring of paint left from the original factory painting over
> the plug, that may shrink the plug sliding over it, and of course drive
> it correctly straight in from the it's center using the tool:
> http://www.eastwood.com/images/us/lo...ail/p20563.jpg or an
> appropriate sized socket and breaker bar.
> God Bless America, Bill O|||||||O
> mailto:-------------------- http://www.----------.com/
>
> Quattro GR4 wrote:
>>
>> Hi Bill -
>>
>> You say "Nope," meaning that bleeding the cooling system had nothing to
>> do with this blowing out? What do you think caused it, and what should
>> I do better to make certain it doesn't happen again?
>>
>> Thank you very much.

 

The right tool for the right job.
Coasty



"L.W. ("ßill") ------ III" <----------@***.net> wrote in message
news:43AB93E8.49C735DA@***.net...
> Preparation is the key to any job. Always take a knife to scrape
> the little ring of paint left from the original factory painting over
> the plug, that may shrink the plug sliding over it, and of course drive
> it correctly straight in from the it's center using the tool:
> http://www.eastwood.com/images/us/lo...ail/p20563.jpg or an
> appropriate sized socket and breaker bar.
> God Bless America, Bill O|||||||O
> mailto:-------------------- http://www.----------.com/
>
> Quattro GR4 wrote:
>>
>> Hi Bill -
>>
>> You say "Nope," meaning that bleeding the cooling system had nothing to
>> do with this blowing out? What do you think caused it, and what should
>> I do better to make certain it doesn't happen again?
>>
>> Thank you very much.

 

"and of course drive it correctly straight in from the it's center
using the tool:"

Thanks Bill - I totally agree, and I did actually order a complete core
plug installation kit on eBay. It helped only a little, but I believed
the plugs went in true. When I redid the blown one I double checked all
the plugs to make certain they were seated flush with the block. I
hope it was just a case of poor installation the first time!

Merry Christmas!

 

"and of course drive it correctly straight in from the it's center
using the tool:"

Thanks Bill - I totally agree, and I did actually order a complete core
plug installation kit on eBay. It helped only a little, but I believed
the plugs went in true. When I redid the blown one I double checked all
the plugs to make certain they were seated flush with the block. I
hope it was just a case of poor installation the first time!

Merry Christmas!

 

"and of course drive it correctly straight in from the it's center
using the tool:"

Thanks Bill - I totally agree, and I did actually order a complete core
plug installation kit on eBay. It helped only a little, but I believed
the plugs went in true. When I redid the blown one I double checked all
the plugs to make certain they were seated flush with the block. I
hope it was just a case of poor installation the first time!

Merry Christmas!

 

You just got unlucky in my opinion. The plugs are a press fit. The rad
cap is supposed to blow at 15 psi or so. That means you had less than
15 psi pushing on it and it just let go.

If it happens again, I would think about gluing the next one in....

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Canadian Off Road Trips Photos: Non members can still view!
Aug./05 http://www.imagestation.com/album/in...?id=2120343242
(More Off Road album links at bottom of the view page)

Quattro GR4 wrote:
>
> Hello - I recently replaced all five 2" core plugs on my 1997 4.0L
> Cherokee with brass plugs due to corrosion of the original steel ones.
> The Cherokee ran great for about two months, and then, under a moment
> of hard acceleration, one of the new plugs blew out. Fortunately the
> engine was not damaged, and I again replaced the one that blew. The
> folks at NAPA said that this can be a common problem when replacing
> core plugs if the cooling system is not bled properly. My question to
> you masters out there is this: is this the probable cause, and if so,
> what is the best way to ensure that this will not occur again? I may
> have saved $600, but the tow cost $100!
>
> Thank you all so very much!

 

You just got unlucky in my opinion. The plugs are a press fit. The rad
cap is supposed to blow at 15 psi or so. That means you had less than
15 psi pushing on it and it just let go.

If it happens again, I would think about gluing the next one in....

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Canadian Off Road Trips Photos: Non members can still view!
Aug./05 http://www.imagestation.com/album/in...?id=2120343242
(More Off Road album links at bottom of the view page)

Quattro GR4 wrote:
>
> Hello - I recently replaced all five 2" core plugs on my 1997 4.0L
> Cherokee with brass plugs due to corrosion of the original steel ones.
> The Cherokee ran great for about two months, and then, under a moment
> of hard acceleration, one of the new plugs blew out. Fortunately the
> engine was not damaged, and I again replaced the one that blew. The
> folks at NAPA said that this can be a common problem when replacing
> core plugs if the cooling system is not bled properly. My question to
> you masters out there is this: is this the probable cause, and if so,
> what is the best way to ensure that this will not occur again? I may
> have saved $600, but the tow cost $100!
>
> Thank you all so very much!

 

You just got unlucky in my opinion. The plugs are a press fit. The rad
cap is supposed to blow at 15 psi or so. That means you had less than
15 psi pushing on it and it just let go.

If it happens again, I would think about gluing the next one in....

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Canadian Off Road Trips Photos: Non members can still view!
Aug./05 http://www.imagestation.com/album/in...?id=2120343242
(More Off Road album links at bottom of the view page)

Quattro GR4 wrote:
>
> Hello - I recently replaced all five 2" core plugs on my 1997 4.0L
> Cherokee with brass plugs due to corrosion of the original steel ones.
> The Cherokee ran great for about two months, and then, under a moment
> of hard acceleration, one of the new plugs blew out. Fortunately the
> engine was not damaged, and I again replaced the one that blew. The
> folks at NAPA said that this can be a common problem when replacing
> core plugs if the cooling system is not bled properly. My question to
> you masters out there is this: is this the probable cause, and if so,
> what is the best way to ensure that this will not occur again? I may
> have saved $600, but the tow cost $100!
>
> Thank you all so very much!

 

Quattro GR4 did pass the time by typing:
> "and of course drive it correctly straight in from the it's center
> using the tool:"
>
> Thanks Bill - I totally agree, and I did actually order a complete core
> plug installation kit on eBay. It helped only a little, but I believed
> the plugs went in true. When I redid the blown one I double checked all
> the plugs to make certain they were seated flush with the block. I
> hope it was just a case of poor installation the first time!

flush, as in the outside edge is flush? That's not seated unless your
talking about a dome type plug. There has to be an edge for the plug to
catch on.

http://www.revbeergoggles.com/temp/plug.jpg is what they should look like.

--
DougW

 

Quattro GR4 did pass the time by typing:
> "and of course drive it correctly straight in from the it's center
> using the tool:"
>
> Thanks Bill - I totally agree, and I did actually order a complete core
> plug installation kit on eBay. It helped only a little, but I believed
> the plugs went in true. When I redid the blown one I double checked all
> the plugs to make certain they were seated flush with the block. I
> hope it was just a case of poor installation the first time!

flush, as in the outside edge is flush? That's not seated unless your
talking about a dome type plug. There has to be an edge for the plug to
catch on.

http://www.revbeergoggles.com/temp/plug.jpg is what they should look like.

--
DougW