Loose Main Caps
Loose Main Caps In the last few weeks, I have been working on rebuilding the stock engine for my F-body. I got the engine out and finally got around to tearing it down last weekend and I noticed the main caps are loose. No register in the caps at all, except for number 1.
The bearings look pretty decent, no signs of excess heat in the caps, so I'm kind of stumped as to how this could have happened. I've only seen something like this two other times, once in a freshly machined sleeved block and another in an engine that spun the mains pretty badly.
So I'm just curious, has anyone out there seen something similar?
The bearings look pretty decent, no signs of excess heat in the caps, so I'm kind of stumped as to how this could have happened. I've only seen something like this two other times, once in a freshly machined sleeved block and another in an engine that spun the mains pretty badly.
So I'm just curious, has anyone out there seen something similar?
In the meantime, I have another block that I was saving for my Mustang that I'm going have to use to replace this one. Oh well.
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Verdad Gallardo Anytime I've had that issue, I've just replaced the caps with known good ones and had the block align honed. Under high loads, the crank is trying to push the caps out of the bottom of the block. They tend to walk around a bit and deform. Sometimes when they are loose, you can have them cut and have the block align bored and they will fit tight again. I usually have a fair amount of used caps laying around so I normally replace them.
Shane
Shane
Anytime I've had that issue, I've just replaced the caps with known good ones and had the block align honed. Under high loads, the crank is trying to push the caps out of the bottom of the block. They tend to walk around a bit and deform. Sometimes when they are loose, you can have them cut and have the block align bored and they will fit tight again. I usually have a fair amount of used caps laying around so I normally replace them.
Shane
Shane
