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compression test

by Keith Wall in 912 / 914 Technical Questions 6 years ago

I need a tool. Has anyone used the Stanley Proto JFP210M Proto Differential Cylinder Pressure Tester.

Re: compression test

by Roger Lee » 6 years ago

Roger Lee

126 5.13k 4.55k

It "should" work. Specs on this thing are hard to come by.

https://www.amazon.com/Stanley-JFP210M-Differential-Cylinder-Pressure/dp/B00BNSJEI2

or

http://www.aircraftspruce.com/catalog/topages/15-05209.php?clickkey=31031

You may want one of these to. Compression tester extension.

http://www.aircraftspruce.com/catalog/topages/extension12mm.php?clickkey=55415

Roger Lee
LSRM-A & Rotax Instructor & Rotax IRC
Tucson, AZ Ryan Airfield (KRYN)
520-349-7056 Cell

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Re: compression test

by David HEAL » 6 years ago

David HEAL

23 186 412

It is my understanding that small cylinder bore engines such as the ROTAX 912 are best evaluated by a compression tester with an appropriately-sized* differential orifice. Lockwood, CPA, LEAF, ACS, etc. all sell this tester. Make sure it has the 12 mm adapter required to fit the 912's spark plug holes.

* See 912 Line Maint Manual: Orifice jet*, of 1mm (0.04 in) inner diameter and 3 mm (0.12 in) length. * or equivalent e.g. orifice diameter 0.040 in., long 0.0250 in., 60° degree approach angle according to AC43.13, latest issue

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