{"product_id":"mazda-rotary-coolant-pressure-tester-12a-13b-20b-renesis-billet","title":"Mazda Rotary Coolant Pressure Tester — 12A \/ 13B \/ 20B \/ Renesis Billet","description":"\u003cp\u003e\u003cstrong\u003eA billet pressure tester that seals off the coolant passage on a freshly built Mazda rotary engine, so you can pressurize the water jacket and find leaks before the engine ever runs. Gauge included.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eAfter a rebuild, the coolant seals (O-rings between the housings and irons) are the parts you most want to confirm. If one is pinched or rolled, you would normally find out the hard way — coolant in the oil, or white smoke on first start. This tester lets you check on the bench instead.\u003c\/p\u003e\n\u003ch3\u003eHow it works\u003c\/h3\u003e\n\u003col\u003e\n\u003cli\u003eBolt the plate onto the engine's coolant opening — the O-ring groove seals it.\u003c\/li\u003e\n\u003cli\u003ePump air in through the Schrader valve with a hand pump or regulated compressor to \u003cstrong\u003e18–20 psi\u003c\/strong\u003e.\u003c\/li\u003e\n\u003cli\u003eWatch the gauge. If the needle holds steady, the cooling side is sealed. If it drops, you have a leak to find before install.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003ch3\u003eWhat's included\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eCNC-machined billet aluminum test plate, JDL MFG logo machined in\u003c\/li\u003e\n\u003cli\u003e0–30 psi liquid-filled gauge\u003c\/li\u003e\n\u003cli\u003eSchrader valve fill port\u003c\/li\u003e\n\u003cli\u003eMachined O-ring groove for a positive seal\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eReusable — test every engine you build.\u003c\/p\u003e\n\u003ch3\u003eFitment\u003c\/h3\u003e\n\u003cp\u003eFits all Mazda rotary engines: 12A, 13B (including REW \/ FD RX-7), 20B and RX-8 Renesis.\u003c\/p\u003e\n\u003cp\u003eMade in-house by JDL Manufacturing.\u003c\/p\u003e","brand":"JDL Manufacturing","offers":[{"title":"Default Title","offer_id":67802171637933,"sku":null,"price":65.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0220\/9402\/0680\/files\/20260901_103307.jpg?v=1793385817","url":"https:\/\/jdlmfg.com\/products\/mazda-rotary-coolant-pressure-tester-12a-13b-20b-renesis-billet","provider":"JDL Manufacturing","version":"1.0","type":"link"}