jacksheehy
Freshman Member
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I'm amazed at the body of knowledge you folks possess. Maybe someone here can answer my question. I'm putting a later TCF numbered engine into a TR3. The pistons are 87mm according to the number on the bottom. I honed the cylinders and bought new rings to freshen the motor up. I bought 86mm +040 Hastings rings from BPNorthwest because I was told they're equivalent to 87mm.
According to the TR4 service manual, the ring gap is supposed to be .010-.015 for the 86mm engine. I can't find a spec for the 87mm engine. I'm seeing about .035 gap for the oil rings and about .017 gap for the compression rings. I used a vernier to measure one of the cylinders and it measures 3.402" which equals 86.4108mm (less than 87mm). So, I have smaller than 87mm cylinders and yet my 87mm rings appear to be to small.
Am I going to have a poor running, oil burning pig when I'm done? The oil rings really worry me.
According to the TR4 service manual, the ring gap is supposed to be .010-.015 for the 86mm engine. I can't find a spec for the 87mm engine. I'm seeing about .035 gap for the oil rings and about .017 gap for the compression rings. I used a vernier to measure one of the cylinders and it measures 3.402" which equals 86.4108mm (less than 87mm). So, I have smaller than 87mm cylinders and yet my 87mm rings appear to be to small.
Am I going to have a poor running, oil burning pig when I'm done? The oil rings really worry me.