Suspect cracked block
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Joined: Nov 2003
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From: Oakville Ontario
Suspect cracked block
I have a Mazda, 2000,B4000, 4L.4x4 with only 80,Kms with lots of coolant in the oil.The heads,intake manifold and gaskets are ok.Dealer says it a cracked block. Has anyone heard of a cracked block on this truck or am I the only one?
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Joined: Jan 2002
Posts: 4,907
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From: suburban atlanta
How did the dealer determine that the heads, etc are OK? I've heard that this and the other V6, (2.8,2.9) in this family are very intolerant of being overheated. They are prone to cracking the heads if overheated. Other than visual inspection on disassembly, or doing compression tests and cooling system pressure tests, (*** in the coolant, etc) you cannot tell what failed.
If you have lots of coolant, realize that the bearings do not like it as a lubricant, and probably will be toast, and surely will have less life left than if they had been lubed with oil only.
If you haven't taken it apart, do the cooling and compression tests to determine the probable failure point. If it is apart, you may be better off with a boneyard engine than a reman or repair depending on how much you can do yourself or how you value the truck.
You don't state the age of the Mazda. Isn't 80K km about 48000 miles? What is the Mazda warranty? I had it in my mind it was a little better than Ford, which, I think, is 36000 miles/36 months. You may still be covered...I'd check for sure.
tom
If you have lots of coolant, realize that the bearings do not like it as a lubricant, and probably will be toast, and surely will have less life left than if they had been lubed with oil only.
If you haven't taken it apart, do the cooling and compression tests to determine the probable failure point. If it is apart, you may be better off with a boneyard engine than a reman or repair depending on how much you can do yourself or how you value the truck.
You don't state the age of the Mazda. Isn't 80K km about 48000 miles? What is the Mazda warranty? I had it in my mind it was a little better than Ford, which, I think, is 36000 miles/36 months. You may still be covered...I'd check for sure.
tom
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Joined: Jan 2003
Posts: 9,748
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From: Connecticut
I'm thinking a leaky lower intake or head gasket. Could also be a slightly cracked head. I seriously doubt there's anything wrong with the block.
My guess is that the dealer did a compression test and cooling system pressure test and didn't find any leakdown so they are thinking that it can't be a gasket isssue or a cracked head.
Unfortuantely, I've read more than a few posts where the 4.0L OHV was losing coolant and driving people crazy because they couldn't figure out where it was going, and the aforementioned tests were coming up negative. And yet, in the end, it was a gasket or cracked head that was found to be the cause. I've even had a little experience with this sort of thing myself.
In short, just because the truck passsed a compression test or cooling system pressure test doesn't automatically mean the heads or gaskets are OK.
My guess is that the dealer did a compression test and cooling system pressure test and didn't find any leakdown so they are thinking that it can't be a gasket isssue or a cracked head.
Unfortuantely, I've read more than a few posts where the 4.0L OHV was losing coolant and driving people crazy because they couldn't figure out where it was going, and the aforementioned tests were coming up negative. And yet, in the end, it was a gasket or cracked head that was found to be the cause. I've even had a little experience with this sort of thing myself.
In short, just because the truck passsed a compression test or cooling system pressure test doesn't automatically mean the heads or gaskets are OK.
Last edited by Rockledge; Feb 22, 2006 at 04:32 PM.
