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bent valve on 1999 grand cherokee 4.7

Old 09-23-2016, 03:26 PM
  #1  
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Year: 1999 jeep grand cherokee laredo 4x4
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Engine: v8
Default bent valve on 1999 grand cherokee 4.7

the mechanic says i have a bent valve and that's why i have no compression. he checked it with a borescope and said this year is famous for doing that cause of problem with oil getting to heads. he then said that my car is pretty much useless cause when it bent valve that metal shavings got into oil and said i'd be lucky to get 500 for it from someone....this car is in very good shape and has had all maintenance done regularly and very clean..
is there any other choice i have here besides putting another engine in it..
thanks
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Old 09-23-2016, 03:41 PM
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Originally Posted by Jasel View Post
is there any other choice i have here besides putting another engine in it..
If you ever want to drive it again it probably needs an engine, if you just want it for a lawn ornament, you're good.
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Old 09-23-2016, 07:29 PM
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Well, if it were mine, I'd pull the head off it and see how much damage was REALLY done. I can see metal shavings blowing out the exhaust, but unless you holed a piston, no metal got into the crankcase. What usually happens is the hardened valve seat insert comes free and interferes with the valve closing, causing it to bend. If that's the case, the piston may be marked up some, but a new head should fix it.

If it really is toast, at least you'll know for sure and it won't cost you anything to find out. Then you can make the decision to either fix it or replace it. If the jeep is in real good shape, I can't see trashing it for want of an engine.
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Old 09-23-2016, 09:22 PM
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Year: 1999 jeep grand cherokee laredo 4x4
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thanks dave
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Old 09-24-2016, 01:31 AM
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Yeah im with dave on this,Have them pull the head see how bad it really is.It could be fixed or worse case replace the whole engine.If its really nice with no problems,no rust and very well taken care of i would spend the money for a new engine.Keep in mind having the engine replaced isn't cheap so plan to keep it a while to get your use out of it.
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