I've never had a reason to doubt these guys ability to do any possible repair needed, be it to a head or a block so I don't doubt them on their diagnosis on the part. Plus I know the old heads with precombustion chanbers were prone tocrack anyway and often couldn't be repaired. That said I've pulled several heads over the years that were 'running' with no problems, til the cause of the rebuild occured, but were damaged to the point that I wouldn't chance putting them back on a rebuilt engine. When it's my butt I'm having to cover it's always better safe than sorry.
As far as any prior problems indicating a cracked head before the engine was pulled, I have no idea there as I never saw it run. When I was finally called in the machine had been sitting for nearly three years after they began having problems with it. Another independent and a CAT dealership mechanic had both been hold of it and did everything from having the injection pump rebuilt to changing injectors, etc, etc. The only thing I was told about the thing was that they both said it had 'low compression'. Between the two of them though they never caught the fact the turbo was bad.... Anyway, having set for that long with the valve cover loose it had gotten water in it and the lifters were stuck in their bores so there was no way I could confirm anything on compression or anything else, and had no choice but to pull it for a complete rebuild.
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Today's Featured Article - Tuning-Up Your Tractor: Secondary Ignition Wires and Distributor - by Curtis Von Fange. In our last episode we spent the entire day checking out the spark plugs. Is that efficency? Actually, it took more time to explain than it really did to do the inspection. At any rate we decided that a compression test was in order so we could verify the internal engine status. That way we wouldn't buy any tune up parts until we were sure that the engine was in reasonable mechanical condition. Our tests showed a fictional compression reading of 85, 80, 82 and 86 psi. That is well within a
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