Question about Jeep CJ5

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I have a cj 5 jeep (F 134 engine) Sent it to a machine shop for rebuild. Put it back in and all 5 freeze plugs have popped out so far, had them replaced and now another one has popped out. 1st one popped out after 60 YDS, 2nd after 30 YDS. I now have maybe 2 miles total. What is happening? HELP

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  • Jeep Master
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You have the honor of being the first person ever to report that problem (I've been building engines for a really long time too!) Sounds like either somehow you have the wrong diameter plugs in there or there is a massive leak from one or more cylinder into the cooling system. if that's the case, I'm surprised the radiator did not explode when you put the cap on. My biggest concern is that there are plugs behind the engine that require engine removal to get to. If they are incorrect they need to come out.
To determine the source of the problem have a hydrocarbon test done on the cooling system or simply put a pressure gauge on the radiator and see if pressure is building up there. (shouldn't be more than the rating of the cap). If pressure is normal then the plugs are wrong. That's bad news but good it happened now rather than three months from now in the middle of nowhere!!
If the system checks out and you decide to replace the plugs yourself, they need to be installed dry. No sealers or grease. Best ones are copper made for marine engines as they don't rust out. Care must be taken though when installing them as copper can deform if they are not put in exactly right.

Posted on May 22, 2011

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1980 JEEP CJ-7 2.5L 4-cyl Engine Code [B]
CAPACITIES
Engine, GM without filter..........2.4 quarts[1]
Wix Filter ........ 51040
Cooling System, Initial Fill..........8.0 quarts
Automatic Transmission, A904, 30RH Initial Fill..........4.0 quarts[2]
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1. Add extra oil when replacing filter. After refill check oil level.
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1980 JEEP CJ-7 4.2L 6-cyl Engine Code [C]
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