1999 XJ Cherokee Diesel Coolant Leak - VIDEO

[Jimmyb]

Core plugs, are usually metal cups that fill the sand casting core holes found on water-cooled internal combustion engines. They are often wrongly called Welsh plugs, frost plugs or freeze plugs.[1]
Sand cores are used to form the internal cavities when the engine block or cylinder head(s) is cast. These cavities are usually the coolant passages. Holes are left in the casting to facilitate the removal of the sand after the casting has cooled.
In some high-performance engines the core plugs are large diameter pipe plugs.[2]
Core plugs can often be a source of leaks due to corrosion caused by cooling system water.[3] Ease of replacement depends on accessibility. In many cases the plug area will be difficult to reach and using a mallet to perform maintenance or replacement will be nearly impossible without special facilities. Expanding rubber plugs are available as replacements when access is a problem.

[Mudmonster]

Originally Posted by layback40

Its a wide serp belt.
If you can get a good one (not Chinese) for $20 let us know where. Supercrap dont have them, repco does, bursons probably do. Because it wider than most, 8V IIRC, they load the price a bit.

I got some from the UK for $30 posted.

[layback40]

Originally Posted by Jimmyb

Core plugs, are usually metal cups that fill the sand casting core holes found on water-cooled internal combustion engines. They are often wrongly called Welsh plugs, frost plugs or freeze plugs.[1]
Sand cores are used to form the internal cavities when the engine block or cylinder head(s) is cast. These cavities are usually the coolant passages. Holes are left in the casting to facilitate the removal of the sand after the casting has cooled.
In some high-performance engines the core plugs are large diameter pipe plugs.[2]
Core plugs can often be a source of leaks due to corrosion caused by cooling system water.[3] Ease of replacement depends on accessibility. In many cases the plug area will be difficult to reach and using a mallet to perform maintenance or replacement will be nearly impossible without special facilities. Expanding rubber plugs are available as replacements when access is a problem.

Text book explanation Jummyb !! 10/10 !!

Us oldies call them welsh plugs, that term is used in old British workshop manuals. I suspect the other names came from America.

The one in question looks like with the removal of a bit of stuff around it, there should be good enough access. Normally just jam a screw driver through it & twist it sideways in the hole & then pull it out. Make sure you dont damage the hole with the screw driver. Clean the hole, use plenty of sealant & push the new one in. The back of a socket can be a good drift.
The old British RWD cars often had one in the back of the block. Too hard to get to so cleaned it up & filled it with silicone or something like that & then dont run pressure in the radiator.

[mud_slut]

Originally Posted by layback40

Its a wide serp belt.
If you can get a good one (not Chinese) for $20 let us know where. Supercrap dont have them, repco does, bursons probably do. Because it wider than most, 8V IIRC, they load the price a bit.

I believe it was a dayco one from repco ill dig around for the receipt tonight