Original Posted By: Dan Yocum
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Re: Pietenpol-List: Certified Engine question
Original Posted By: "Dan Yocum"
There's a Continental service bulletin, M84-15, that says that the compression needs to be referenced to the "Master Orfice Tool," part number 646953-A. They sell the tool, it's a bar with female spark plug threads at each end and a calibrated orfice in the middle. The idea is that you hook up the compressor to it and with the regulator gauge set to exactly 80 psi, using the tool, the cylinder gauge ought to show 40 to 50 psi. If it doesn't the differential tester is out of calibration and can't be used.You'll have to refer to the service bulletin for more details.Back about 20 years ago, mine cost around $40. Nicely made tool in a plastic case. Not something you'd find at Home Depot.David Paule----- Original Message -----
There's a Continental service bulletin, M84-15, that says that the compression needs to be referenced to the "Master Orfice Tool," part number 646953-A. They sell the tool, it's a bar with female spark plug threads at each end and a calibrated orfice in the middle. The idea is that you hook up the compressor to it and with the regulator gauge set to exactly 80 psi, using the tool, the cylinder gauge ought to show 40 to 50 psi. If it doesn't the differential tester is out of calibration and can't be used.You'll have to refer to the service bulletin for more details.Back about 20 years ago, mine cost around $40. Nicely made tool in a plastic case. Not something you'd find at Home Depot.David Paule----- Original Message -----
Re: Pietenpol-List: Certified Engine question
Original Posted By: David Paule
Not quite right. When you use the master orifice tool, once you set your tester to input 80 psi, you use the number you get as the new minimum. It does not mean that you can't use your tester, just that you have derived a new minimum psi based on the master orifice tool.Gene ----- Original Message -----
Not quite right. When you use the master orifice tool, once you set your tester to input 80 psi, you use the number you get as the new minimum. It does not mean that you can't use your tester, just that you have derived a new minimum psi based on the master orifice tool.Gene ----- Original Message -----
Re: Pietenpol-List: Certified Engine question
Original Posted By: Gene Rambo
Well, that's what I was tryin' to say. Thanks for making it a lot clearer!Dave ----- Original Message -----
Well, that's what I was tryin' to say. Thanks for making it a lot clearer!Dave ----- Original Message -----
Re: Pietenpol-List: Certified Engine question
Original Posted By: Dan Yocum