Is there any mention of the Mahamrityunjay Mantra in the Puranas?
Linga Purana, Vol 2, Chapter 54 is completely dedicated to Tryambaka mantra alone. It describes the procedure of worshipping Shivalinga with Tryambaka mantra.
त्रियंबकेण मंत्रेण देवदेवं त्रियंबकम्।
पूजयेद्वाणलिङ्ग वा स्वयंभूतेऽपि वा पुनः॥१॥
Uttering the Tryambaka mantra, a devotee should worship Tryambaka in Bāņa-linga and Svayambhu-linga.
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