1996: old 10HP Faryman (already rebuilt once ,) finally blew at mid-May haul in. one local yard X claimed it had 'Yan mar certified technicians.' I ordered a new 2GM20F (through family business) drop shipped to yard X. dropped by a week later, my new engine was sitting out on their receiving dock in the rain. tech went in and ground off old solid fiberglass engine beds unevenly, left was 1 inch higher than right, engine and p shaft would never align properly with that big difference. tech was perplexed when i asked to see his engine install mockup box for his alignment . (recommended, per my Yan engine install manual which I had ordered.) i asked to see his copy of engine install manual, tech said it was in the office. went to office, met yard manager, asked to see yan install manual : 'we don't have one.' Q;" how many new diesels has D installed ?" " yours is the first one." " no, it isn't. " Rx: My boat was towed out of there to another much busier yard where it waited June till Sept. for a new engine. but that engine was installed right.